Class: Magick::Image
- Inherits:
-
Object
- Object
- Magick::Image
- Includes:
- Comparable
- Defined in:
- lib/rmagick_internal.rb,
ext/RMagick/rmmain.c
Overview
Ruby-level Magick::Image methods
Defined Under Namespace
Classes: DrawOptions, Info, PolaroidOptions, View
Class Method Summary collapse
-
._load(str) ⇒ Magic::Image
Implement marshalling.
-
.capture(*args) ⇒ Magick::Image
Reads an image from an X window.
-
.constitute(width_arg, height_arg, map_arg, pixels_arg) ⇒ Magick::Image
Creates an Image from the supplied pixel data.
-
.from_blob(blob_arg) ⇒ Array<Magick::Image>
Convert direct to memory image formats from string data.
-
.ping(file_arg) ⇒ Array<Magick::Image>
Returns all the properties of an image or image sequence except for the pixels.
-
.read(file_arg) ⇒ Array<Magick::Image>
Call ReadImage.
-
.read_inline(content) ⇒ Array<Magick::Image>
Read a Base64-encoded image.
Instance Method Summary collapse
-
#<=>(other) ⇒ -1, ...
Compare two images.
-
#[](key_arg) ⇒ String
Returns the value of the image property identified by key.
-
#[]=(key_arg, attr_arg) ⇒ Magick::Image
Sets the value of an image property.
-
#_dump(depth) ⇒ String
Implement marshalling.
-
#adaptive_blur(radius = 0.0, sigma = 1.0) ⇒ Magick::Image
Adaptively blurs the image by blurring more intensely near image edges and less intensely far from edges.
-
#adaptive_blur_channel(*args) ⇒ Magick::Image
The same as #adaptive_blur except only the specified channels are blurred.
-
#adaptive_resize(*args) ⇒ Magick::Image
Resizes the image with data dependent triangulation.
-
#adaptive_sharpen(radius = 0.0, sigma = 1.0) ⇒ Magick::Image
Adaptively sharpens the image by sharpening more intensely near image edges and less intensely far from edges.
-
#adaptive_sharpen_channel(*args) ⇒ Magick::Image
The same as #adaptive_sharpen except only the specified channels are sharpened.
-
#adaptive_threshold(width = 3, height = 3, offset = 0) ⇒ Magick::Image
Selects an individual threshold for each pixel based on the range of intensity values in its local neighborhood.
-
#add_compose_mask(mask) ⇒ Object
Associates a mask with an image that will be used as the destination image in a #composite operation.
-
#add_noise(noise) ⇒ Magick::Image
Adds random noise to the image.
-
#add_noise_channel(*args) ⇒ Magick::Image
Adds random noise to the specified channel or channels in the image.
-
#add_profile(name) ⇒ Magick::Image
Adds an ICC (a.k.a. ICM), IPTC, or generic profile.
-
#affine_transform(affine) ⇒ Magick::Image
Transform an image as dictated by the affine matrix argument.
-
#alpha(*args) ⇒ Object
Get/Set alpha channel.
-
#alpha? ⇒ Boolean
Determine whether the image’s alpha channel is activated.
-
#annotate(draw, width, height, x, y, text, &block) ⇒ Object
Provide an alternate version of Draw#annotate, for folks who want to find it in this class.
-
#auto_gamma_channel(*args) ⇒ Magick::Image
“Automagically” adjust the gamma level of an image.
-
#auto_level_channel(*args) ⇒ Magick::Image
“Automagically” adjust the color levels of an image.
-
#auto_orient ⇒ Magick::Image
Rotates or flips the image based on the image’s EXIF orientation tag.
-
#auto_orient! ⇒ Magick::Image?
Rotates or flips the image based on the image’s EXIF orientation tag.
-
#background_color ⇒ String
Return the name of the background color as a String.
-
#background_color=(color) ⇒ Magick::Pixel, String
Set the the background color to the specified color spec.
-
#base_columns ⇒ Numeric
Return the number of rows (before transformations).
-
#base_filename ⇒ String
Return the image filename (before transformations).
-
#base_rows ⇒ Numeric
Return the number of rows (before transformations).
-
#bias ⇒ Float
Get image bias (used when convolving an image).
-
#bias=(pct) ⇒ Float, String
Set image bias (used when convolving an image).
-
#bilevel_channel(*args) ⇒ Magick::Image
Changes the value of individual pixels based on the intensity of each pixel channel.
-
#black_point_compensation ⇒ Boolean
Return current black point compensation attribute.
-
#black_point_compensation=(arg) ⇒ Boolean
Set black point compensation attribute.
-
#black_threshold(*args) ⇒ Numeric
Forces all pixels below the threshold into black while leaving all pixels above the threshold unchanged.
-
#blend(overlay, src_percent, dst_percent, gravity = Magick::NorthWestGravity, x_offset = 0, y_offset = 0) ⇒ Magick::Image
Adds the overlay image to the target image according to src_percent and dst_percent.
-
#blue_shift(factor = 1.5) ⇒ Magick::Image
Simulate a scene at nighttime in the moonlight.
-
#blur_channel(*args) ⇒ Magick::Image
Blurs the specified channel.
-
#blur_image(radius = 0.0, sigma = 1.0) ⇒ Magick::Image
Blur the image.
-
#border(width, height, color) ⇒ Magick::Image
Surrounds the image with a border of the specified width, height, and named color.
-
#border!(width, height, color) ⇒ Object
Surrounds the image with a border of the specified width, height, and named color.
-
#border_color ⇒ String
Return the name of the border color as a String.
-
#border_color=(color) ⇒ Magick::Pixel, String
Set the the border color.
-
#bounding_box ⇒ Magick::Rectangle
Returns the bounding box of an image canvas.
-
#change_geometry(geom_arg) {|column, row, image| ... } ⇒ Object
This method supports resizing a method by specifying constraints.
-
#change_geometry!(geom_arg) {|column, row, image| ... } ⇒ Object
This method supports resizing a method by specifying constraints.
-
#changed? ⇒ Boolean
Return true if any pixel in the image has been altered since the image was constituted.
-
#channel(channel_arg) ⇒ Magick::Image
Extract a channel from the image.
-
#channel_compare(*args) ⇒ Array
Compare one or more channels in two images and returns the specified distortion metric and a comparison image.
-
#channel_depth(*args) ⇒ Numeric
Returns the maximum depth for the specified channel or channels.
- #channel_entropy(*args) ⇒ Object
-
#channel_extrema(*args) ⇒ Array<Numeric>
Returns the minimum and maximum intensity values for the specified channel or channels.
-
#channel_mean(*args) ⇒ Array<Float>
Returns the mean and standard deviation values for the specified channel or channels.
-
#charcoal(radius = 0.0, sigma = 1.0) ⇒ Magick::Image
Return a new image that is a copy of the input image with the edges highlighted.
-
#check_destroyed ⇒ nil
Raises DestroyedImageError if the image has been destroyed.
-
#chop(x, y, width, height) ⇒ Magick::Image
Remove a region of an image and collapses the image to occupy the removed portion.
-
#chromaticity ⇒ Magick::Chromaticity
Return the red, green, blue, and white-point chromaticity values as a Chromaticity.
-
#chromaticity=(chroma) ⇒ Magick::Chromaticity
Set the red, green, blue, and white-point chromaticity values from a Chromaticity.
-
#class_type ⇒ Magick::ClassType
Return the image’s storage class (a.k.a. storage type, class type).
-
#class_type=(new_class_type) ⇒ Magick::ClassType
Change the image’s storage class.
-
#clone ⇒ Magick::Image
Same as #dup except the frozen state of the original is propagated to the new copy.
-
#clut_channel(*args) ⇒ Magick::Image
Replace the channel values in the target image with a lookup of its replacement value in an LUT gradient image.
-
#color_fill_to_border(x, y, fill) ⇒ Object
Set all pixels that are neighbors of x,y and are not the border color to the fill color.
-
#color_flood_fill(target_color, fill_color, xv, yv, method) ⇒ Magick::Image
Change the color value of any pixel that matches target_color and is an immediate neighbor.
-
#color_floodfill(x, y, fill) ⇒ Object
Set all pixels that have the same color as the pixel at x,y and are neighbors to the fill color.
-
#color_histogram ⇒ Hash
Computes the number of times each unique color appears in the image.
-
#color_point(x, y, fill) ⇒ Object
Set the color at x,y.
-
#color_profile ⇒ String?
Return the ICC color profile as a String.
-
#color_profile=(profile) ⇒ String
Set the ICC color profile.
-
#color_reset!(fill) ⇒ Object
Set all pixels to the fill color.
-
#colorize(*args) ⇒ Magick::Image
Blend the fill color specified by “target” with each pixel in the image.
-
#colormap(*args) ⇒ String
Return the color in the colormap at the specified index.
-
#colors ⇒ Numeric
Get the number of colors in the colormap.
-
#colorspace ⇒ Magick::ColorspaceType
Return the Image pixel interpretation.
-
#colorspace=(colorspace) ⇒ Magick::ColorspaceType
Set the image’s colorspace.
-
#columns ⇒ Numeric
Get image columns.
-
#compare_channel(*args) ⇒ Array
Compare one or more channels in two images and returns the specified distortion metric and a comparison image.
-
#compose ⇒ Magick::CompositeOperator
Return the composite operator attribute.
-
#compose=(compose_arg) ⇒ Magick::CompositeOperator
Set the composite operator attribute.
-
#composite(*args) ⇒ Magick::Image
Composites src onto dest using the specified composite operator.
-
#composite!(*args) ⇒ Magick::Image
Composites src onto dest using the specified composite operator.
-
#composite_affine(source, affine_matrix) ⇒ Magick::Image
Composite the source over the destination image as dictated by the affine transform.
-
#composite_channel(*args) ⇒ Magick::Image
Composite the source over the destination image channel as dictated by the affine transform.
-
#composite_channel!(*args) ⇒ Magick::Image
Composite the source over the destination image channel as dictated by the affine transform.
-
#composite_mathematics(*args) ⇒ Magick::Image
Merge the source and destination images according to the formula a*Sc*Dc + b*Sc + c*Dc + d where Sc is the source pixel and Dc is the destination pixel.
-
#composite_tiled(*args) ⇒ Magick::Image
Composites multiple copies of the source image across and down the image, producing the same results as ImageMagick’s composite command with the -tile option.
-
#composite_tiled!(*args) ⇒ Magick::Image
Composites multiple copies of the source image across and down the image, producing the same results as ImageMagick’s composite command with the -tile option.
-
#compress_colormap! ⇒ Magick::Image
Removes duplicate or unused entries in the colormap.
-
#compression ⇒ Magick::CompressionType
Get the compression attribute.
-
#compression=(compression) ⇒ Magick::CompressionType
Set the compression attribute.
-
#contrast(sharpen = false) ⇒ Magick::Image
Enhance the intensity differences between the lighter and darker elements of the image.
-
#contrast_stretch_channel(*args) ⇒ Magick::Image
This method is a simple image enhancement technique that attempts to improve the contrast in an image by ‘stretching’ the range of intensity values it contains to span a desired range of values.
-
#convolve(order_arg, kernel_arg) ⇒ Magick::Image
Apply a custom convolution kernel to the image.
-
#convolve_channel(*args) ⇒ Magick::Image
Applies a custom convolution kernel to the specified channel or channels in the image.
-
#copy ⇒ Magick::Image
Alias for #dup.
-
#crop(*args) ⇒ Magick::Image
Extract a region of the image defined by width, height, x, y.
-
#crop!(*args) ⇒ Magick::Image
Extract a region of the image defined by width, height, x, y.
-
#cur_image ⇒ Object
Used by ImageList methods - see ImageList#cur_image.
-
#cycle_colormap(amount) ⇒ Magick::Image
Displaces the colormap by a given number of positions.
-
#decipher(passphrase) ⇒ Magick::Image
Decipher an enciphered image.
-
#define(artifact, value) ⇒ String
Associates makes a copy of the given string arguments and inserts it into the artifact tree.
-
#delay ⇒ Numeric
Get the Number of ticks which must expire before displaying the next image in an animated sequence.
-
#delay=(val) ⇒ Numeric
Set the Number of ticks which must expire before displaying the next image in an animated sequence.
-
#delete_compose_mask ⇒ Magick::Image
Delete the image composite mask.
-
#delete_profile(name) ⇒ Magick::Image
Deletes the specified profile.
-
#density ⇒ String
Get the vertical and horizontal resolution in pixels of the image.
-
#density=(density_arg) ⇒ String, Magick::Geometry
Set the vertical and horizontal resolution in pixels of the image.
-
#depth ⇒ Numeric
Return the image depth (8, 16 or 32).
-
#deskew(threshold = 0.40, auto_crop_width = nil) ⇒ Magick::Image
Straightens an image.
-
#despeckle ⇒ Magick::Image
Reduce the speckle noise in an image while preserving the edges of the original image.
-
#destroy! ⇒ Magick::Image
Free all the memory associated with an image.
-
#destroyed? ⇒ Boolean
Return true if the image has been destroyed, false otherwise.
-
#difference(other) ⇒ Array<Float>
Compares two images and computes statistics about their difference.
-
#directory ⇒ String
Get image directory.
-
#dispatch(x, y, columns, rows, map, float = false) ⇒ Array<Numeric>
Extract pixel data from the image and returns it as an array of pixels.
-
#displace(displacement_map, x_amp, y_amp = x_amp, gravity = Magick::NorthWestGravity, x_offset = 0, y_offset = 0) ⇒ Magick::Image
Uses displacement_map to move color from img to the output image.
-
#display ⇒ Magick::Image
(also: #__display__)
Display the image to an X window screen.
-
#dispose ⇒ Magick::DisposeType
Return the dispose attribute as a DisposeType enum.
-
#dispose=(dispose) ⇒ Magick::DisposeType
Set the dispose attribute.
-
#dissolve(overlay, src_percent, dst_percent = -1.0, gravity = Magick::NorthWestGravity, x_offset = 0, y_offset = 0) ⇒ Magick::Image
Composites the overlay image into the target image.
-
#distort(*args) ⇒ Magick::Image
Distort an image using the specified distortion type and its required arguments.
-
#distortion_channel(*args) ⇒ Float
Compares one or more image channels of an image to a reconstructed image and returns the specified distortion metric.
-
#dup ⇒ Magick::Image
Duplicates a image.
-
#each_iptc_dataset ⇒ Object
Iterate over IPTC record number:dataset tags, yield for each non-nil dataset.
-
#each_pixel ⇒ Object
Thanks to Russell Norris!.
-
#each_profile {|name, val| ... } ⇒ Object
Calls block once for each profile in the image, passing the profile name and value as parameters.
-
#edge(radius = 0.0) ⇒ Magick::Image
Find edges in an image.
-
#emboss(radius = 0.0, sigma = 1.0) ⇒ Magick::Image
Adds a 3-dimensional effect.
-
#encipher(passphrase) ⇒ Magick::Image
Encipher an image.
-
#endian ⇒ Magick::EndianType
Return endian option for images that support it.
-
#endian=(type) ⇒ Magick::EndianType
Set endian option for images that support it.
-
#enhance ⇒ Magick::Image
Apply a digital filter that improves the quality of a noisy image.
-
#equalize ⇒ Magick::Image
Apply a histogram equalization to the image.
-
#equalize_channel(*args) ⇒ Magick::Image
Applies a histogram equalization to the image.
-
#erase! ⇒ Magick::Image
Reset the image to the background color.
-
#excerpt(x, y, width, height) ⇒ Magick::Image
This method is very similar to crop.
-
#excerpt!(x, y, width, height) ⇒ Magick::Image
In-place form of #excerpt.
-
#export_pixels(x = 0, y = 0, cols = self.columns, rows = self.rows, map = "RGB") ⇒ Array<Numeric>
Extracts the pixel data from the specified rectangle and returns it as an array of Integer values.
-
#export_pixels_to_str(x = 0, y = 0, cols = self.columns, rows = self.rows, map = "RGB", type = Magick::CharPixel) ⇒ String
Extracts the pixel data from the specified rectangle and returns it as a string.
-
#extent(width, height, x = 0, y = 0) ⇒ Magick::Image
If width or height is greater than the target image’s width or height, extends the width and height of the target image to the specified values.
-
#extract_info ⇒ Magick::Rectangle
The extract_info attribute reader.
-
#extract_info=(rect) ⇒ Magick::Rectangle
Set the extract_info attribute.
-
#filename ⇒ String
Get image filename.
-
#filesize ⇒ Numeric
Return the image file size.
-
#filter ⇒ Magick::FilterType
Get filter type.
-
#filter=(filter) ⇒ Magick::FilterType
Set filter type.
-
#find_similar_region(target, x = 0, y = 0) ⇒ Array<Numeric>?
This interesting method searches for a rectangle in the image that is similar to the target.
-
#flip ⇒ Magick::Image
Create a vertical mirror image by reflecting the pixels around the central x-axis.
-
#flip! ⇒ Magick::Image
Create a vertical mirror image by reflecting the pixels around the central x-axis.
-
#flop ⇒ Magick::Image
Create a horizonal mirror image by reflecting the pixels around the central y-axis.
-
#flop! ⇒ Magick::Image
Create a horizonal mirror image by reflecting the pixels around the central y-axis.
-
#format ⇒ String?
Return the image encoding format.
-
#format=(magick) ⇒ String
Set the image encoding format.
-
#frame(width = self.columns+25*2, height = self.rows+25*2, x = 25, y = 25, inner_bevel = 6, outer_bevel = 6, color = self.matte_color) ⇒ Magick::Image
Add a simulated three-dimensional border around the image.
-
#function_channel(*args) ⇒ Magick::Image
Set the function on a channel.
-
#fuzz ⇒ Float
Get the number of algorithms search for a target color.
-
#fuzz=(fuzz) ⇒ String, Float
Set the number of algorithms search for a target color.
-
#fx(*args) ⇒ Magick::Image
Apply fx on the image.
-
#gamma ⇒ Float
Get the gamma level of the image.
-
#gamma=(val) ⇒ Float
Set the gamma level of the image.
-
#gamma_channel(*args) ⇒ Magick::Image
Apply gamma to a channel.
-
#gamma_correct(red_gamma, green_gamma = red_gamma, blue_gamma = green_gamma) ⇒ Magick::Image
gamma-correct an image.
-
#gaussian_blur(radius = 0.0, sigma = 1.0) ⇒ Magick::Image
Blur the image.
-
#gaussian_blur_channel(*args) ⇒ Magick::Image
Blur the image on a channel.
-
#geometry ⇒ String
Get the preferred size of the image when encoding.
-
#geometry=(geometry) ⇒ String
Set the preferred size of the image when encoding.
-
#get_exif_by_entry(*entry) ⇒ Object
Retrieve EXIF data by entry or all.
-
#get_exif_by_number(*tag) ⇒ Object
Retrieve EXIF data by tag number or all tag/value pairs.
-
#get_iptc_dataset(ds) ⇒ Object
Retrieve IPTC information by record number:dataset tag constant defined in Magick::IPTC, above.
-
#get_pixels(x_arg, y_arg, cols_arg, rows_arg) ⇒ Array<Magick::Pixel>
Gets the pixels from the specified rectangle within the image.
-
#gravity ⇒ Magick::GravityType
Get the direction that the image gravitates within the composite.
-
#gravity=(gravity) ⇒ Magick::GravityType
Set the direction that the image gravitates within the composite.
-
#gray? ⇒ Boolean
Return true if all the pixels in the image have the same red, green, and blue intensities.
-
#grey? ⇒ Boolean
Return true if all the pixels in the image have the same red, green, and blue intensities.
-
#histogram? ⇒ Boolean
Return true if has 1024 unique colors or less.
-
#image_type ⇒ Magick::ImageType
Get the image type classification.
-
#image_type=(image_type) ⇒ Magick::ImageType
Set the image type classification.
-
#implode(amount = 0.50) ⇒ Magick::Image
Implode the image by the specified percentage.
-
#store_pixels(x, y, columns, rows, map, pixels, type = Magick::CharPixel) ⇒ Magick::Image
Store image pixel data from an array.
-
#initialize(cols, rows, fill = nil) ⇒ Magick::Image
constructor
Initialize a new Image object If the fill argument is omitted, fill with background color.
-
#initialize_copy(orig) ⇒ Magick::Image
Initialize copy, clone, dup.
-
#inspect ⇒ String
Override Object#inspect - return a string description of the image.
-
#interlace ⇒ Magick::InterlaceType
Get the type of interlacing scheme (default NoInterlace).
-
#interlace=(interlace) ⇒ Magick::InterlaceType
Set the type of interlacing scheme.
-
#iptc_profile ⇒ String?
Return the IPTC profile as a String.
-
#iptc_profile=(profile) ⇒ String
Set the IPTC profile.
-
#iterations ⇒ Object
These are undocumented methods.
-
#iterations=(val) ⇒ Object
do not document! Only used by Image#iterations=.
-
#level(black_point = 0.0, white_point = nil, gamma = nil) ⇒ Object
(Thanks to Al Evans for the suggestion.).
-
#level2(black_point = 0.0, white_point = Magick::QuantumRange, gamma = 1.0) ⇒ Magick::Image
Adjusts the levels of an image by scaling the colors falling between specified white and black points to the full available quantum range.
-
#level_channel(aChannelType, black = 0.0, white = 1.0, gamma = Magick::QuantumRange) ⇒ Magick::Image
Similar to #level2 but applies to a single channel only.
-
#level_colors(*args) ⇒ Magick::Image
When invert is true, black and white will be mapped to the black_color and white_color colors, compressing all other colors linearly.
-
#levelize_channel(*args) ⇒ Magick::Image
Maps black and white to the specified points.
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#linear_stretch(black_point, white_point = pixels-black_point) ⇒ Magick::Image
Linear with saturation stretch.
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#liquid_rescale(columns, rows, delta_x = 0.0, rigidity = 0.0) ⇒ Magick::Image
Rescale image with seam carving.
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#magnify ⇒ Magick::Image
Scale an image proportionally to twice its size.
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#magnify! ⇒ Magick::Image
Scale an image proportionally to twice its size.
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#marshal_dump ⇒ Array<String>
Support Marshal.dump.
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#marshal_load(ary) ⇒ Object
Support Marshal.load.
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#mask(*args) ⇒ Magick::Image
Get/Sets an image clip mask created from the specified mask image.
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#matte_color ⇒ String
Return the matte color.
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#matte_color=(color) ⇒ Magick::Pixel, String
Set the matte color.
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#matte_fill_to_border(x, y) ⇒ Object
Make transparent any neighbor pixel that is not the border color.
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#Image ⇒ Magick::Image
Makes transparent all the pixels that are the same color as the pixel at x, y, and are neighbors.
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#matte_floodfill(x, y) ⇒ Object
Make transparent any pixel that matches the color of the pixel at (x,y) and is a neighbor.
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#matte_point(x, y) ⇒ Object
Make the pixel at (x,y) transparent.
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#matte_replace(x, y) ⇒ Object
Make transparent all pixels that are the same color as the pixel at (x, y).
-
#matte_reset! ⇒ Object
Make all pixels transparent.
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#mean_error_per_pixel ⇒ Float
Get the mean error per pixel computed when a image is color reduced.
-
#median_filter(radius = 0.0) ⇒ Magick::Image
Apply a digital filter that improves the quality of a noisy image.
-
#mime_type ⇒ String?
Return the officially registered (or de facto) MIME media-type corresponding to the image format.
-
#minify ⇒ Magick::Image
Scale an image proportionally to half its size.
-
#minify! ⇒ Magick::Image
Scale an image proportionally to half its size.
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#modulate(brightness = 1.0, saturation = 1.0, hue = 1.0) ⇒ Magick::Image
Changes the brightness, saturation, and hue.
-
#monitor=(monitor) ⇒ Proc
Establish a progress monitor.
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#monochrome? ⇒ Boolean
Return true if all the pixels in the image have the same red, green, and blue intensities and the intensity is either 0 or QuantumRange.
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#montage ⇒ String
Tile size and offset within an image montage.
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#morphology(method_v, iterations, kernel_v) ⇒ Magick::Image
Apply a user supplied kernel to the image according to the given mophology method.
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#morphology_channel(channel_v, method_v, iterations, kernel_v) ⇒ Magick::Image
Apply a user supplied kernel to the image channel according to the given mophology method.
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#motion_blur(radius = 0.0, sigma = 1.0, angle = 0.0) ⇒ Magick::Image
Simulate motion blur.
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#negate(grayscale = false) ⇒ Magick::Image
Negate the colors in the reference image.
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#negate_channel(*args) ⇒ Magick::Image
Negate the colors on a particular channel.
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#normalize ⇒ Magick::Image
Enhance the contrast of a color image by adjusting the pixels color to span the entire range of colors available.
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#normalize_channel(channel = Magick::AllChannels) ⇒ Magick::Image
Enhances the contrast of a color image by adjusting the pixel color to span the entire range of colors available.
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#normalized_maximum_error ⇒ Float
Get The normalized maximum error per pixel computed when an image is color reduced.
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#normalized_mean_error ⇒ Float
Get the normalized mean error per pixel computed when an image is color reduced.
-
#number_colors ⇒ Numeric
Return the number of unique colors in the image.
-
#offset ⇒ Number
Get the number of bytes to skip over when reading raw image.
-
#offset=(val) ⇒ Number
Set the number of bytes to skip over when reading raw image.
-
#oil_paint(radius = 3.0) ⇒ Magick::Image
Apply a special effect filter that simulates an oil painting.
-
#opaque(target, fill) ⇒ Magick::Image
Change any pixel that matches target with the color defined by fill.
-
#opaque? ⇒ Boolean
Returns true if all of the pixels in the receiver have an opacity value of OpaqueOpacity.
-
#opaque_channel(*args) ⇒ Magick::Image
Changes all pixels having the target color to the fill color.
-
#ordered_dither(threshold_map = '2x2') ⇒ Magick::Image
Dithers the image to a predefined pattern.
-
#orientation ⇒ Magick::OrientationType
Get the value of the Exif Orientation Tag.
-
#orientation=(orientation) ⇒ Magick::OrientationType
Set the orientation attribute.
-
#page ⇒ Magick::Rectang
The page attribute getter.
-
#page=(rect) ⇒ Magick::Rectang
The page attribute setter.
-
#paint_transparent(target, invert, fuzz, alpha: Magick::TransparentAlpha) ⇒ Magick::Image
Changes the opacity value of all the pixels that match color to the value specified by opacity.
-
#palette? ⇒ Boolean
Return true if the image is PseudoClass and has 256 unique colors or less.
-
#pixel_color(*args) ⇒ Object
Get/set the color of the pixel at x, y.
-
#pixel_interpolation_method ⇒ Magick::PixelInterpolateMethod
Get the “interpolate” field.
-
#pixel_interpolation_method=(method) ⇒ Magick::PixelInterpolateMethod
Set the “interpolate” field.
-
#polaroid(*args) ⇒ Magick::Image
Produce an image that looks like a Polaroid instant picture.
-
#posterize(levels = 4, dither = false) ⇒ Object
Reduces the image to a limited number of colors for a “poster” effect.
-
#preview(preview) ⇒ Magick::Image
Creates an image that contains 9 small versions of the receiver image.
-
#profile!(name, profile) ⇒ Magick::Image
Set the image profile.
-
#properties ⇒ Object
If called with an associated block, properties runs the block once for each property defined for the image.
-
#quality ⇒ Numeric
Get image quality.
-
#quantize(number_colors = 256, colorspace = Magick::RGBColorspace, dither = true, tree_depth = 0, measure_error = false) ⇒ Magick::Image
Analyzes the colors within a reference image and chooses a fixed number of colors to represent the image.
-
#quantum_depth ⇒ Numeric
Return the image depth to the nearest Quantum (8, 16, or 32).
-
#quantum_operator(*args) ⇒ Magick::Image
Performs the requested integer arithmetic operation on the selected channel of the image.
-
#radial_blur(angle_obj) ⇒ Magick::Image
Applies a radial blur to the image.
-
#radial_blur_channel(*args) ⇒ Magick::Image
Applies a radial blur to the selected image channels.
-
#raise(width = 6, height = 6, raised = true) ⇒ Magick::Image
Create a simulated three-dimensional button-like effect by lightening and darkening the edges of the image.
-
#random_threshold_channel(*args) ⇒ Magick::Image
Changes the value of individual pixels based on the intensity of each pixel compared to a random threshold.
-
#recolor(color_matrix) ⇒ Magick::Image
Use this method to translate, scale, shear, or rotate image colors.
-
#reduce_noise(radius) ⇒ Magick::Image
Smooth the contours of an image while still preserving edge information.
-
#remap(remap_image, dither_method = Magick::RiemersmaDitherMethod) ⇒ Object
(also: #affinity)
Reduce the number of colors in img to the colors used by remap_image.
-
#rendering_intent ⇒ Magick::RenderingIntent
Get the type of rendering intent.
-
#rendering_intent=(ri) ⇒ Magick::RenderingIntent
Set the type of rendering intent..
-
#resample(x_resolution = 72.0, y_resolution = 72.0, filter = self.filter, blur = self.blur) ⇒ Magick
Resample image to specified horizontal resolution, vertical resolution, filter and blur factor.
-
#resample!(x_resolution = 72.0, y_resolution = 72.0, filter = self.filter, blur = self.blur) ⇒ Magick
Resample image to specified horizontal resolution, vertical resolution, filter and blur factor.
-
#resize(*args) ⇒ Magick::Image
Scale an image to the desired dimensions using the specified filter and blur factor.
-
#resize!(*args) ⇒ Magick::Image
Scale an image to the desired dimensions using the specified filter and blur factor.
-
#resize_to_fill(ncols, nrows = nil, gravity = CenterGravity) ⇒ Object
(also: #crop_resized)
Force an image to exact dimensions without changing the aspect ratio.
- #resize_to_fill!(ncols, nrows = nil, gravity = CenterGravity) ⇒ Object (also: #crop_resized!)
-
#resize_to_fit(cols, rows = nil) ⇒ Object
Convenience method to resize retaining the aspect ratio.
- #resize_to_fit!(cols, rows = nil) ⇒ Object
-
#roll(x_offset, y_offset) ⇒ Magick::Image
Offset an image as defined by x_offset and y_offset.
-
#rotate(*args) ⇒ Magick::Image
Rotate the receiver by the specified angle.
-
#rotate!(*args) ⇒ Magick::Image
Rotate the image.
-
#rows ⇒ Numeric
Return image rows.
-
#sample(*args) ⇒ Magick::Image
Scale an image to the desired dimensions with pixel sampling.
-
#sample!(*args) ⇒ Magick::Image
Scale an image to the desired dimensions with pixel sampling.
-
#scale(*args) ⇒ Magick::Image
Change the size of an image to the given dimensions.
-
#scale!(*args) ⇒ Magick::Image
Change the size of an image to the given dimensions.
-
#scene ⇒ Numeric
Return the scene number assigned to the image the last time the image was written to a multi-image image file.
-
#segment(colorspace = Magick::RGBColorspace, cluster_threshold = 1.0, smoothing_threshold = 1.5, verbose = false) ⇒ Magick::Image
Segments an image by analyzing the histograms of the color components and identifying units that are homogeneous with the fuzzy c-means technique.
-
#selective_blur_channel(*args) ⇒ Magick::Image
Selectively blur pixels within a contrast threshold.
-
#separate(*args) ⇒ Magick::ImageList
Constructs a grayscale image for each channel specified.
-
#sepiatone(threshold = Magick::QuantumRange) ⇒ Magick::Image
Applies a special effect to the image, similar to the effect achieved in a photo darkroom by sepia toning.
-
#set_channel_depth(channel_arg, depth) ⇒ Object
Sets the depth of the image channel.
-
#shade(shading = false, azimuth = 30.0, elevation = 30.0) ⇒ Magick::Image
Shine a distant light on an image to create a three-dimensional effect.
-
#Image ⇒ Magick::Image
Call ShadowImage.
-
#sharpen(radius = 0.0, sigma = 1.0) ⇒ Magick::Image
Sharpen an image.
-
#sharpen_channel(*args) ⇒ Magick::Image
Sharpen image on a channel.
-
#shave(width, height) ⇒ Magick::Image
Shave pixels from the image edges, leaving a rectangle of the specified width & height in the center.
-
#shave!(width, height) ⇒ Magick::Image
Shave pixels from the image edges, leaving a rectangle of the specified width & height in the center.
-
#shear(x_shear, y_shear) ⇒ Magick::Image
Shearing slides one edge of an image along the X or Y axis, creating a parallelogram.
-
#sigmoidal_contrast_channel(*args) ⇒ Magick::Image
Adjusts the contrast of an image channel with a non-linear sigmoidal contrast algorithm.
-
#signature ⇒ String?
Compute a message digest from an image pixel stream with an implementation of the NIST SHA-256 Message Digest algorithm.
-
#sketch(radius = 0.0, sigma = 1.0, angle = 0.0) ⇒ Magick::Image
Simulates a pencil sketch.
-
#solarize(threshold = 50.0) ⇒ Object
Apply a special effect to the image, similar to the effect achieved in a photo darkroom by selectively exposing areas of photo sensitive paper to light.
-
#sparse_color(*args) ⇒ Magick::Image
Fills the image with the specified color or colors, starting at the x,y coordinates associated with the color and using the specified interpolation method.
-
#splice(x, y, width, height, color = self.background_color) ⇒ Magick::Image
Splice a solid color into the part of the image specified by the x, y, width, and height arguments.
-
#spread(radius = 3.0) ⇒ Magick::Image
Randomly displace each pixel in a block defined by “radius”.
-
#start_loop ⇒ Boolean
Get the Boolean value that indicates the first image in an animation.
-
#start_loop=(val) ⇒ Boolean
Set the Boolean value that indicates the first image in an animation.
-
#stegano(watermark_image, offset) ⇒ Magick::Image
Hides a digital watermark in the receiver.
-
#stereo(offset_image_arg) ⇒ Magick::Image
Combine two images and produces a single image that is the composite of a left and right image of a stereo pair.
-
#store_pixels(x_arg, y_arg, cols_arg, rows_arg, new_pixels) ⇒ Magick::Image
Replace the pixels in the specified rectangle with the pixels in the pixels array.
-
#strip! ⇒ Magick::Image
Strips an image of all profiles and comments.
-
#swirl(degrees_obj) ⇒ Magick::Image
Swirl the pixels about the center of the image, where degrees indicates the sweep of the arc through which each pixel is moved.
-
#texture_fill_to_border(x, y, texture) ⇒ Object
Replace neighboring pixels to border color with texture pixels.
-
#texture_flood_fill(color_obj, texture_obj, x_obj, y_obj, method_obj) ⇒ Magick::Image
Emulates Magick++‘s floodFillTexture.
-
#texture_floodfill(x, y, texture) ⇒ Object
Replace matching neighboring pixels with texture pixels.
-
#threshold(threshold_obj) ⇒ Magick::Image
Change the value of individual pixels based on the intensity of each pixel compared to threshold.
-
#thumbnail(*args) ⇒ Magick::Image
The thumbnail method is a fast resizing method suitable for use when the size of the resulting image is < 10% of the original.
-
#thumbnail!(*args) ⇒ Magick::Image
The thumbnail method is a fast resizing method suitable for use when the size of the resulting image is < 10% of the original.
-
#ticks_per_second ⇒ Numeric
Get the number of ticks per second.
-
#ticks_per_second=(tps) ⇒ Numeric
Set the number of ticks per second.
-
#tint(tint, red_alpha, green_alpha = red_alpha, blue_alpha = red_alpha, alpha_alpha = 1.0) ⇒ Object
Applies a color vector to each pixel in the image.
-
#to_blob ⇒ String
Return a “blob” (a String) from the image.
-
#to_color(pixel_arg) ⇒ String
Return a color name for the color intensity specified by the Magick::Pixel argument.
-
#total_colors ⇒ Numeric
Alias for #number_colors.
-
#total_ink_density ⇒ Float
Return the total ink density for a CMYK image.
-
#transparent(color, alpha: Magick::TransparentAlpha) ⇒ Magick::Image
Changes the opacity value of all the pixels that match color to the value specified by opacity.
-
#transparent_chroma(low, high, invert, alpha: Magick::TransparentAlpha) ⇒ Magick::Image
Changes the opacity value associated with any pixel between low and high to the value defined by opacity.
-
#transparent_color ⇒ String
Return the name of the transparent color as a String.
-
#transparent_color=(color) ⇒ Magick::Pixel, String
Set the the transparent color to the specified color spec.
-
#transpose ⇒ Magick::Image
Creates a horizontal mirror image by reflecting the pixels around the central y-axis while rotating them by 90 degrees.
-
#transpose! ⇒ Magick::Image
Creates a horizontal mirror image by reflecting the pixels around the central y-axis while rotating them by 90 degrees.
-
#transverse ⇒ Magick::Image
Creates a vertical mirror image by reflecting the pixels around the central x-axis while rotating them by 270 degrees.
-
#transverse! ⇒ Magick::Image
Creates a vertical mirror image by reflecting the pixels around the central x-axis while rotating them by 270 degrees In-place form of #transverse.
-
#trim(reset = false) ⇒ Magick::Image
Removes the edges that are exactly the same color as the corner pixels.
-
#trim!(reset = false) ⇒ Magick::Image
Removes the edges that are exactly the same color as the corner pixels.
-
#undefine(artifact) ⇒ Magick::Image
Removes an artifact from the image and returns its value.
-
#unique_colors ⇒ Magick::Image
Constructs a new image with one pixel for each unique color in the image.
-
#units ⇒ Magick::ResolutionType
Get the units of image resolution.
-
#units=(restype) ⇒ Magick::ResolutionType
Set the units of image resolution.
-
#unsharp_mask(radius = 0.0, sigma = 1.0, amount = 1.0, threshold = 0.05) ⇒ Magick::Image
Sharpen an image.
-
#unsharp_mask_channel(*args) ⇒ Magick::Image
Sharpen an image.
-
#view(x, y, width, height) ⇒ Object
Construct a view.
-
#vignette(horz_radius = self.columns*0.1+0.5, vert_radius = self.rows*0.1+0.5, radius = 0.0, sigma = 1.0) ⇒ Magick::Image
Soften the edges of an image.
-
#virtual_pixel_method ⇒ Magick::VirtualPixelMethod
Get the “virtual pixels” behave.
-
#virtual_pixel_method=(method) ⇒ Magick::VirtualPixelMethod
Specify how “virtual pixels” behave.
-
#watermark(*args) ⇒ Magick::Image
Composites a watermark image on the target image using the Modulate composite operator.
-
#wave(amplitude = 25.0, wavelength = 150.0) ⇒ Magick::Image
Create a “ripple” effect in the image by shifting the pixels vertically along a sine wave whose amplitude and wavelength is specified by the given parameters.
-
#wet_floor(initial = 0.5, rate = 1.0) ⇒ Magick::Image
Creates a “wet floor” reflection.
-
#white_threshold(red, green, blue, alpha: alpha) ⇒ Magick::Image
Forces all pixels above the threshold into white while leaving all pixels below the threshold unchanged.
-
#write(file) ⇒ Magick::Image
Write the image to the file.
-
#x_resolution ⇒ Float
Get the horizontal resolution of the image.
-
#x_resolution=(val) ⇒ Float
Set the horizontal resolution of the image.
-
#y_resolution ⇒ Float
Get the vertical resolution of the image.
-
#y_resolution=(val) ⇒ Float
Set the vertical resolution of the image.
Constructor Details
#initialize(cols, rows, fill = nil) ⇒ Magick::Image
Initialize a new Image object If the fill argument is omitted, fill with background color.
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# File 'ext/RMagick/rmimage.c', line 9439
VALUE
Image_initialize(int argc, VALUE *argv, VALUE self)
{
VALUE fill = Qnil;
Info *info;
VALUE info_obj;
Image *image;
unsigned long cols, rows;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
switch (argc)
{
case 3:
fill = argv[2];
case 2:
rows = NUM2ULONG(argv[1]);
cols = NUM2ULONG(argv[0]);
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 or 3)", argc);
break;
}
// Create a new Info object to use when creating this image.
info_obj = rm_info_new();
Data_Get_Struct(info_obj, Info, info);
image = rm_acquire_image(info);
if (!image)
{
rb_raise(rb_eNoMemError, "not enough memory to continue");
}
rm_set_user_artifact(image, info);
// NOW store a real image in the image object.
UPDATE_DATA_PTR(self, image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
SetImageExtent(image, cols, rows, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
SetImageExtent(image, cols, rows);
#endif
// If the caller did not supply a fill argument, call SetImageBackgroundColor
// to fill the image using the background color. The background color can
// be set by specifying it when creating the Info parm block.
if (NIL_P(fill))
{
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
SetImageBackgroundColor(image, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
SetImageBackgroundColor(image);
#endif
}
// fillobj.fill(self)
else
{
rb_funcall(fill, rm_ID_fill, 1, self);
}
RB_GC_GUARD(fill);
RB_GC_GUARD(info_obj);
return self;
}
|
Class Method Details
._load(str) ⇒ Magic::Image
Implement marshalling.
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# File 'ext/RMagick/rmimage.c', line 8464
VALUE
Image__load(VALUE class ATTRIBUTE_UNUSED, VALUE str)
{
Image *image;
ImageInfo *info;
DumpedImage mi;
ExceptionInfo *exception;
char *blob;
long length;
blob = rm_str2cstr(str, &length);
// Must be as least as big as the 1st 4 fields in DumpedImage
if (length <= (long)(sizeof(DumpedImage)-MaxTextExtent))
{
rb_raise(rb_eTypeError, "image is invalid or corrupted (too short)");
}
// Retrieve & validate the image format from the header portion
mi.id = ((DumpedImage *)blob)->id;
if (mi.id != DUMPED_IMAGE_ID)
{
rb_raise(rb_eTypeError, "image is invalid or corrupted (invalid header)");
}
mi.mj = ((DumpedImage *)blob)->mj;
mi.mi = ((DumpedImage *)blob)->mi;
if ( mi.mj != DUMPED_IMAGE_MAJOR_VERS
|| mi.mi > DUMPED_IMAGE_MINOR_VERS)
{
rb_raise(rb_eTypeError, "incompatible image format (can't be read)\n"
"\tformat version %d.%d required; %d.%d given",
DUMPED_IMAGE_MAJOR_VERS, DUMPED_IMAGE_MINOR_VERS,
mi.mj, mi.mi);
}
mi.len = ((DumpedImage *)blob)->len;
// Must be bigger than the header
if (length <= (long)(mi.len+sizeof(DumpedImage)-MaxTextExtent))
{
rb_raise(rb_eTypeError, "image is invalid or corrupted (too short)");
}
info = CloneImageInfo(NULL);
memcpy(info->magick, ((DumpedImage *)blob)->magick, mi.len);
info->magick[mi.len] = '\0';
exception = AcquireExceptionInfo();
blob += offsetof(DumpedImage, magick) + mi.len;
length -= offsetof(DumpedImage, magick) + mi.len;
image = BlobToImage(info, blob, (size_t) length, exception);
DestroyImageInfo(info);
rm_check_exception(exception, image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(image);
}
|
.capture(silent = false, frame = false, descend = false, screen = false, borders = false) ⇒ Magick::Image .capture(silent = false, frame = false, descend = false, screen = false, borders = false) { ... } ⇒ Magick::Image
Reads an image from an X window. Unless you identify a window to capture via the optional arguments block, when capture is invoked the cursor will turn into a cross. Click the cursor on the window to be captured.
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# File 'ext/RMagick/rmimage.c', line 2001
VALUE
Image_capture(int argc, VALUE *argv, VALUE self ATTRIBUTE_UNUSED)
{
Image *new_image;
ImageInfo *image_info;
VALUE info_obj;
XImportInfo ximage_info;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
XGetImportInfo(&ximage_info);
switch (argc)
{
case 5:
ximage_info.borders = (MagickBooleanType)RTEST(argv[4]);
case 4:
ximage_info.screen = (MagickBooleanType)RTEST(argv[3]);
case 3:
ximage_info.descend = (MagickBooleanType)RTEST(argv[2]);
case 2:
ximage_info.frame = (MagickBooleanType)RTEST(argv[1]);
case 1:
ximage_info.silent = (MagickBooleanType)RTEST(argv[0]);
case 0:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 5)", argc);
break;
}
// Get optional parms.
// Set info->filename = "root", window ID number or window name,
// or nothing to do an interactive capture
// Set info->server_name to the server name
// Also info->colorspace, depth, dither, interlace, type
info_obj = rm_info_new();
Data_Get_Struct(info_obj, Info, image_info);
// If an error occurs, IM will call our error handler and we raise an exception.
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
new_image = XImportImage(image_info, &ximage_info, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
new_image = XImportImage(image_info, &ximage_info);
rm_check_image_exception(new_image, DestroyOnError);
#endif
rm_ensure_result(new_image);
rm_set_user_artifact(new_image, image_info);
RB_GC_GUARD(info_obj);
return rm_image_new(new_image);
}
|
.constitute(width_arg, height_arg, map_arg, pixels_arg) ⇒ Magick::Image
Creates an Image from the supplied pixel data. The pixel data must be in scanline order, top-to-bottom. The pixel data is an array of either all Fixed or all Float elements. If Fixed, the elements must be in the range [0..QuantumRange]. If Float, the elements must be normalized [0..1]. The “map” argument reflects the expected ordering of the pixel array. It can be any combination or order of R = red, G = green, B = blue, A = alpha, C = cyan, Y = yellow, M = magenta, K = black, or I = intensity (for grayscale).
The pixel array must have width X height X strlen(map) elements.
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# File 'ext/RMagick/rmimage.c', line 4035
VALUE
Image_constitute(VALUE class ATTRIBUTE_UNUSED, VALUE width_arg, VALUE height_arg,
VALUE map_arg, VALUE pixels_arg)
{
Image *new_image;
VALUE pixel, pixel0;
long width, height, x, npixels, map_l;
char *map;
volatile union
{
double *f;
Quantum *i;
void *v;
} pixels;
VALUE pixel_class;
StorageType stg_type;
ExceptionInfo *exception;
// rb_Array converts objects that are not Arrays to Arrays if possible,
// and raises TypeError if it can't.
pixels_arg = rb_Array(pixels_arg);
width = NUM2LONG(width_arg);
height = NUM2LONG(height_arg);
if (width <= 0 || height <= 0)
{
rb_raise(rb_eArgError, "width and height must be greater than zero");
}
map = rm_str2cstr(map_arg, &map_l);
npixels = width * height * map_l;
if (RARRAY_LEN(pixels_arg) != npixels)
{
rb_raise(rb_eArgError, "wrong number of array elements (%ld for %ld)",
RARRAY_LEN(pixels_arg), npixels);
}
// Inspect the first element in the pixels array to determine the expected
// type of all the elements. Allocate the pixel buffer.
pixel0 = rb_ary_entry(pixels_arg, 0);
if (rb_obj_is_kind_of(pixel0, rb_cFloat) == Qtrue)
{
pixels.f = ALLOC_N(double, npixels);
stg_type = DoublePixel;
pixel_class = rb_cFloat;
}
else if (rb_obj_is_kind_of(pixel0, rb_cInteger) == Qtrue)
{
pixels.i = ALLOC_N(Quantum, npixels);
stg_type = QuantumPixel;
pixel_class = rb_cInteger;
}
else
{
rb_raise(rb_eTypeError, "element 0 in pixel array is %s, must be numeric",
rb_class2name(CLASS_OF(pixel0)));
}
// Convert the array elements to the appropriate C type, store in pixel
// buffer.
for (x = 0; x < npixels; x++)
{
pixel = rb_ary_entry(pixels_arg, x);
if (rb_obj_is_kind_of(pixel, pixel_class) != Qtrue)
{
xfree(pixels.v);
rb_raise(rb_eTypeError, "element %ld in pixel array is %s, expected %s",
x, rb_class2name(CLASS_OF(pixel)), rb_class2name(CLASS_OF(pixel0)));
}
if (pixel_class == rb_cFloat)
{
pixels.f[x] = (float) NUM2DBL(pixel);
if (pixels.f[x] < 0.0 || pixels.f[x] > 1.0)
{
xfree(pixels.v);
rb_raise(rb_eArgError, "element %ld is out of range [0..1]: %f", x, pixels.f[x]);
}
}
else
{
pixels.i[x] = NUM2QUANTUM(pixel);
}
}
// This is based on ConstituteImage in IM 5.5.7
new_image = rm_acquire_image((ImageInfo *) NULL);
if (!new_image)
{
xfree(pixels.v);
rb_raise(rb_eNoMemError, "not enough memory to continue.");
}
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
SetImageExtent(new_image, width, height, exception);
#else
SetImageExtent(new_image, width, height);
exception = &new_image->exception;
#endif
if (rm_should_raise_exception(exception, RetainExceptionRetention))
{
xfree(pixels.v);
#if defined(IMAGEMAGICK_7)
DestroyImage(new_image);
rm_raise_exception(exception);
#else
rm_check_image_exception(new_image, DestroyOnError);
#endif
}
#if defined(IMAGEMAGICK_7)
SetImageBackgroundColor(new_image, exception);
#else
SetImageBackgroundColor(new_image);
exception = &new_image->exception;
#endif
if (rm_should_raise_exception(exception, RetainExceptionRetention))
{
xfree(pixels.v);
#if defined(IMAGEMAGICK_7)
DestroyImage(new_image);
rm_raise_exception(exception);
#else
rm_check_image_exception(new_image, DestroyOnError);
#endif
}
#if defined(IMAGEMAGICK_7)
ImportImagePixels(new_image, 0, 0, width, height, map, stg_type, (const void *)pixels.v, exception);
xfree(pixels.v);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
ImportImagePixels(new_image, 0, 0, width, height, map, stg_type, (const void *)pixels.v);
xfree(pixels.v);
rm_check_image_exception(new_image, DestroyOnError);
#endif
RB_GC_GUARD(pixel);
RB_GC_GUARD(pixel0);
RB_GC_GUARD(pixel_class);
return rm_image_new(new_image);
}
|
.from_blob(blob) ⇒ Array<Magick::Image> .from_blob(blob) { ... } ⇒ Array<Magick::Image>
Convert direct to memory image formats from string data.
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# File 'ext/RMagick/rmimage.c', line 6890
VALUE
Image_from_blob(VALUE class ATTRIBUTE_UNUSED, VALUE blob_arg)
{
Image *images;
Info *info;
VALUE info_obj;
ExceptionInfo *exception;
void *blob;
long length;
blob = (void *) rm_str2cstr(blob_arg, &length);
// Get a new Info object - run the parm block if supplied
info_obj = rm_info_new();
Data_Get_Struct(info_obj, Info, info);
exception = AcquireExceptionInfo();
images = BlobToImage(info, blob, (size_t)length, exception);
rm_check_exception(exception, images, DestroyOnError);
DestroyExceptionInfo(exception);
rm_ensure_result(images);
rm_set_user_artifact(images, info);
RB_GC_GUARD(info_obj);
return array_from_images(images);
}
|
.ping(file_arg) ⇒ Array<Magick::Image>
Returns all the properties of an image or image sequence except for the pixels.
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# File 'ext/RMagick/rmimage.c', line 10120
VALUE
Image_ping(VALUE class, VALUE file_arg)
{
return rd_image(class, file_arg, PingImage);
}
|
.read(file_arg) ⇒ Array<Magick::Image>
Call ReadImage.
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# File 'ext/RMagick/rmimage.c', line 11011
VALUE
Image_read(VALUE class, VALUE file_arg)
{
return rd_image(class, file_arg, ReadImage);
}
|
.read_inline(content) ⇒ Array<Magick::Image>
Read a Base64-encoded image.
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# File 'ext/RMagick/rmimage.c', line 11204
VALUE
Image_read_inline(VALUE self ATTRIBUTE_UNUSED, VALUE content)
{
VALUE info_obj;
Image *images;
ImageInfo *info;
char *image_data;
long x, image_data_l;
unsigned char *blob;
size_t blob_l;
ExceptionInfo *exception;
image_data = rm_str2cstr(content, &image_data_l);
// Search for a comma. If found, we'll set the start of the
// image data just following the comma. Otherwise we'll assume
// the image data starts with the first byte.
for (x = 0; x < image_data_l; x++)
{
if (image_data[x] == ',')
{
break;
}
}
if (x < image_data_l)
{
image_data += x + 1;
}
blob = Base64Decode(image_data, &blob_l);
if (blob_l == 0)
{
rb_raise(rb_eArgError, "can't decode image");
}
exception = AcquireExceptionInfo();
// Create a new Info structure for this read. About the
// only useful attribute that can be set is `format'.
info_obj = rm_info_new();
Data_Get_Struct(info_obj, Info, info);
images = BlobToImage(info, blob, blob_l, exception);
magick_free((void *)blob);
rm_check_exception(exception, images, DestroyOnError);
DestroyExceptionInfo(exception);
rm_set_user_artifact(images, info);
RB_GC_GUARD(info_obj);
return array_from_images(images);
}
|
Instance Method Details
#<=>(other) ⇒ -1, ...
Compare two images.
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# File 'ext/RMagick/rmimage.c', line 12825
VALUE
Image_spaceship(VALUE self, VALUE other)
{
Image *imageA, *imageB;
const char *sigA, *sigB;
int res;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
imageA = rm_check_destroyed(self);
// If the other object isn't a Image object, then they can't be equal.
if (!rb_obj_is_kind_of(other, Class_Image))
{
return Qnil;
}
imageB = rm_check_destroyed(other);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
SignatureImage(imageA, exception);
CHECK_EXCEPTION();
SignatureImage(imageB, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
SignatureImage(imageA);
SignatureImage(imageB);
#endif
sigA = rm_get_property(imageA, "signature");
sigB = rm_get_property(imageB, "signature");
if (!sigA || !sigB)
{
rb_raise(Class_ImageMagickError, "can't get image signature");
}
res = memcmp(sigA, sigB, 64);
res = res > 0 ? 1 : (res < 0 ? -1 : 0); // reduce to 1, -1, 0
return INT2FIX(res);
}
|
#[](key_arg) ⇒ String
Returns the value of the image property identified by key. An image may have any number of properties.
Each property is identified by a string (or symbol) key. The property value is a string. ImageMagick predefines some properties, including “Label”, “Comment”, “Signature”, and in some cases “EXIF”.
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# File 'ext/RMagick/rmimage.c', line 726
VALUE
Image_aref(VALUE self, VALUE key_arg)
{
Image *image;
const char *key;
const char *attr;
image = rm_check_destroyed(self);
switch (TYPE(key_arg))
{
case T_NIL:
return Qnil;
case T_SYMBOL:
key = rb_id2name((ID)SYM2ID(key_arg));
break;
default:
key = StringValueCStr(key_arg);
if (*key == '\0')
{
return Qnil;
}
break;
}
if (rm_strcasecmp(key, "EXIF:*") == 0)
{
return rm_exif_by_entry(image);
}
else if (rm_strcasecmp(key, "EXIF:!") == 0)
{
return rm_exif_by_number(image);
}
attr = rm_get_property(image, key);
return attr ? rb_str_new2(attr) : Qnil;
}
|
#[]=(key_arg, attr_arg) ⇒ Magick::Image
Sets the value of an image property. An image may have any number of properties.
-
Specify attr=nil to remove the key from the list.
-
SetImageProperty normally APPENDS the new value to any existing value. Since this usage is tremendously counter-intuitive, this function always deletes the existing value before setting the new value.
-
There’s no use checking the return value since SetImageProperty returns “False” for many reasons, some legitimate.
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# File 'ext/RMagick/rmimage.c', line 781
VALUE
Image_aset(VALUE self, VALUE key_arg, VALUE attr_arg)
{
Image *image;
const char *key;
char *attr;
unsigned int okay;
image = rm_check_frozen(self);
attr = attr_arg == Qnil ? NULL : StringValueCStr(attr_arg);
switch (TYPE(key_arg))
{
case T_NIL:
return self;
case T_SYMBOL:
key = rb_id2name((ID)SYM2ID(key_arg));
break;
default:
key = StringValueCStr(key_arg);
if (*key == '\0')
{
return self;
}
break;
}
// Delete existing value. SetImageProperty returns False if
// the attribute doesn't exist - we don't care.
rm_set_property(image, key, NULL);
// Set new value
if (attr)
{
okay = rm_set_property(image, key, attr);
if (!okay)
{
rb_warning("SetImageProperty failed (probably out of memory)");
}
}
return self;
}
|
#_dump(depth) ⇒ String
Implement marshalling.
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# File 'ext/RMagick/rmimage.c', line 5710
VALUE
Image__dump(VALUE self, VALUE depth ATTRIBUTE_UNUSED)
{
Image *image;
ImageInfo *info;
void *blob;
size_t length;
DumpedImage mi;
VALUE str;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
info = CloneImageInfo(NULL);
if (!info)
{
rb_raise(rb_eNoMemError, "not enough memory to continue");
}
strlcpy(info->magick, image->magick, sizeof(info->magick));
exception = AcquireExceptionInfo();
blob = ImageToBlob(info, image, &length, exception);
// Free ImageInfo first - error handling may raise an exception
DestroyImageInfo(info);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
if (!blob)
{
rb_raise(rb_eNoMemError, "not enough memory to continue");
}
// Create a header for the blob: ID and version
// numbers, followed by the length of the magick
// string stored as a byte, followed by the
// magick string itself.
mi.id = DUMPED_IMAGE_ID;
mi.mj = DUMPED_IMAGE_MAJOR_VERS;
mi.mi = DUMPED_IMAGE_MINOR_VERS;
strlcpy(mi.magick, image->magick, sizeof(mi.magick));
mi.len = (unsigned char) min((size_t)UCHAR_MAX, rm_strnlen_s(mi.magick, sizeof(mi.magick)));
// Concatenate the blob onto the header & return the result
str = rb_str_new((char *)&mi, (long)(mi.len+offsetof(DumpedImage, magick)));
str = rb_str_buf_cat(str, (char *)blob, (long)length);
magick_free((void*)blob);
RB_GC_GUARD(str);
return str;
}
|
#adaptive_blur(radius = 0.0, sigma = 1.0) ⇒ Magick::Image
Adaptively blurs the image by blurring more intensely near image edges and less intensely far from edges. The #adaptive_blur method blurs the image with a Gaussian operator of the given radius and standard deviation (sigma). For reasonable results, radius should be larger than sigma. Use a radius of 0 and adaptive_blur selects a suitable radius for you.
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# File 'ext/RMagick/rmimage.c', line 214
VALUE
Image_adaptive_blur(int argc, VALUE *argv, VALUE self)
{
return adaptive_method(argc, argv, self, AdaptiveBlurImage);
}
|
#adaptive_blur_channel(radius = 0.0, sigma = 1.0, channel = Magick::AllChannels) ⇒ Magick::Image #adaptive_blur_channel(radius = 0.0, sigma = 1.0, *channels) ⇒ Magick::Image
The same as #adaptive_blur except only the specified channels are blurred.
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# File 'ext/RMagick/rmimage.c', line 237
VALUE
Image_adaptive_blur_channel(int argc, VALUE *argv, VALUE self)
{
#if defined(IMAGEMAGICK_7)
return adaptive_channel_method(argc, argv, self, AdaptiveBlurImage);
#else
return adaptive_channel_method(argc, argv, self, AdaptiveBlurImageChannel);
#endif
}
|
#adaptive_resize(scale_val) ⇒ Magick::Image #adaptive_resize(cols, rows) ⇒ Magick::Image
Resizes the image with data dependent triangulation.
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# File 'ext/RMagick/rmimage.c', line 262
VALUE
Image_adaptive_resize(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
unsigned long rows, columns;
double scale_val, drows, dcols;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
switch (argc)
{
case 2:
rows = NUM2ULONG(argv[1]);
columns = NUM2ULONG(argv[0]);
break;
case 1:
scale_val = NUM2DBL(argv[0]);
if (scale_val < 0.0)
{
rb_raise(rb_eArgError, "invalid scale_val value (%g given)", scale_val);
}
drows = scale_val * image->rows + 0.5;
dcols = scale_val * image->columns + 0.5;
if (drows > (double)ULONG_MAX || dcols > (double)ULONG_MAX)
{
rb_raise(rb_eRangeError, "resized image too big");
}
rows = (unsigned long) drows;
columns = (unsigned long) dcols;
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 or 2)", argc);
break;
}
exception = AcquireExceptionInfo();
new_image = AdaptiveResizeImage(image, columns, rows, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#adaptive_sharpen(radius = 0.0, sigma = 1.0) ⇒ Magick::Image
Adaptively sharpens the image by sharpening more intensely near image edges and less intensely far from edges.
The #adaptive_sharpen method sharpens the image with a Gaussian operator of the given radius and standard deviation (sigma).
For reasonable results, radius should be larger than sigma. Use a radius of 0 and adaptive_sharpen selects a suitable radius for you.
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# File 'ext/RMagick/rmimage.c', line 323
VALUE
Image_adaptive_sharpen(int argc, VALUE *argv, VALUE self)
{
return adaptive_method(argc, argv, self, AdaptiveSharpenImage);
}
|
#adaptive_sharpen_channel(radius = 0.0, sigma = 1.0, channel = Magick::AllChannels) ⇒ Magick::Image #adaptive_sharpen_channel(radius = 0.0, sigma = 1.0, *channels) ⇒ Magick::Image
The same as #adaptive_sharpen except only the specified channels are sharpened.
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# File 'ext/RMagick/rmimage.c', line 346
VALUE
Image_adaptive_sharpen_channel(int argc, VALUE *argv, VALUE self)
{
#if defined(IMAGEMAGICK_7)
return adaptive_channel_method(argc, argv, self, AdaptiveSharpenImage);
#else
return adaptive_channel_method(argc, argv, self, AdaptiveSharpenImageChannel);
#endif
}
|
#adaptive_threshold(width = 3, height = 3, offset = 0) ⇒ Magick::Image
Selects an individual threshold for each pixel based on the range of intensity values in its local neighborhood. This allows for thresholding of an image whose global intensity histogram doesn’t contain distinctive peaks.
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# File 'ext/RMagick/rmimage.c', line 369
VALUE
Image_adaptive_threshold(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
unsigned long width = 3, height = 3;
long offset = 0;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
switch (argc)
{
case 3:
offset = NUM2LONG(argv[2]);
case 2:
height = NUM2ULONG(argv[1]);
case 1:
width = NUM2ULONG(argv[0]);
case 0:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 3)", argc);
}
exception = AcquireExceptionInfo();
new_image = AdaptiveThresholdImage(image, width, height, offset, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#add_compose_mask(mask) ⇒ Object
Associates a mask with an image that will be used as the destination image in a #composite operation.
The areas of the destination image that are masked by white pixels will be modified by the #composite method, while areas masked by black pixels are unchanged.
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# File 'ext/RMagick/rmimage.c', line 413
VALUE
Image_add_compose_mask(VALUE self, VALUE mask)
{
Image *image, *mask_image = NULL;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
Image *clip_mask = NULL;
#endif
image = rm_check_frozen(self);
mask_image = rm_check_destroyed(mask);
if (image->columns != mask_image->columns || image->rows != mask_image->rows)
{
rb_raise(rb_eArgError, "mask must be the same size as image");
}
#if defined(IMAGEMAGICK_7)
clip_mask = rm_clone_image(mask_image);
exception = AcquireExceptionInfo();
NegateImage(clip_mask, MagickFalse, exception);
rm_check_exception(exception, clip_mask, DestroyOnError);
SetImageMask(image, CompositePixelMask, clip_mask, exception);
DestroyImage(clip_mask);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
// Delete any previously-existing mask image.
// Store a clone of the new mask image.
SetImageMask(image, mask_image);
NegateImage(image->mask, MagickFalse);
// Since both Set and GetImageMask clone the mask image I don't see any
// way to negate the mask without referencing it directly. Sigh.
#endif
return self;
}
|
#add_noise(noise) ⇒ Magick::Image
Adds random noise to the image.
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# File 'ext/RMagick/rmimage.c', line 459
VALUE
Image_add_noise(VALUE self, VALUE noise)
{
Image *image, *new_image;
NoiseType noise_type;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
VALUE_TO_ENUM(noise, noise_type, NoiseType);
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
new_image = AddNoiseImage(image, noise_type, 1.0, exception);
#else
new_image = AddNoiseImage(image, noise_type, exception);
#endif
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#add_noise_channel(noise_type, channel = Magick::AllChannels) ⇒ Magick::Image #add_noise_channel(noise_type, *channels) ⇒ Magick::Image
Adds random noise to the specified channel or channels in the image.
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# File 'ext/RMagick/rmimage.c', line 495
VALUE
Image_add_noise_channel(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
NoiseType noise_type;
ExceptionInfo *exception;
ChannelType channels;
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
// There must be 1 remaining argument.
if (argc == 0)
{
rb_raise(rb_eArgError, "missing noise type argument");
}
else if (argc > 1)
{
raise_ChannelType_error(argv[argc-1]);
}
VALUE_TO_ENUM(argv[0], noise_type, NoiseType);
channels &= ~OpacityChannel;
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
BEGIN_CHANNEL_MASK(image, channels);
new_image = AddNoiseImage(image, noise_type, 1.0, exception);
END_CHANNEL_MASK(new_image);
#else
new_image = AddNoiseImageChannel(image, channels, noise_type, exception);
#endif
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#add_profile(name) ⇒ Magick::Image
Adds an ICC (a.k.a. ICM), IPTC, or generic profile. If the file contains more than one profile all the profiles are added.
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# File 'ext/RMagick/rmimage.c', line 541
VALUE
Image_add_profile(VALUE self, VALUE name)
{
// ImageMagick code based on the code for the "-profile" option in mogrify.c
Image *image, *profile_image;
ImageInfo *info;
ExceptionInfo *exception;
char *profile_name;
char *profile_filename = NULL;
const StringInfo *profile;
image = rm_check_frozen(self);
// ProfileImage issues a warning if something goes wrong.
profile_filename = StringValueCStr(name);
info = CloneImageInfo(NULL);
if (!info)
{
rb_raise(rb_eNoMemError, "not enough memory to continue");
}
profile = GetImageProfile(image, "iptc");
if (profile)
{
info->profile = (void *)CloneStringInfo(profile);
}
strlcpy(info->filename, profile_filename, sizeof(info->filename));
exception = AcquireExceptionInfo();
profile_image = ReadImage(info, exception);
DestroyImageInfo(info);
rm_check_exception(exception, profile_image, DestroyOnError);
rm_ensure_result(profile_image);
ResetImageProfileIterator(profile_image);
profile_name = GetNextImageProfile(profile_image);
while (profile_name)
{
profile = GetImageProfile(profile_image, profile_name);
if (profile)
{
#if defined(IMAGEMAGICK_7)
ProfileImage(image, profile_name, GetStringInfoDatum(profile), GetStringInfoLength(profile), exception);
if (rm_should_raise_exception(exception, RetainExceptionRetention))
#else
ProfileImage(image, profile_name, GetStringInfoDatum(profile), GetStringInfoLength(profile), MagickFalse);
if (rm_should_raise_exception(&image->exception, RetainExceptionRetention))
#endif
{
break;
}
}
profile_name = GetNextImageProfile(profile_image);
}
DestroyImage(profile_image);
#if defined(IMAGEMAGICK_7)
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
DestroyExceptionInfo(exception);
rm_check_image_exception(image, RetainOnError);
#endif
return self;
}
|
#affine_transform(affine) ⇒ Magick::Image
Transform an image as dictated by the affine matrix argument.
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# File 'ext/RMagick/rmimage.c', line 693
VALUE
Image_affine_transform(VALUE self, VALUE affine)
{
Image *image, *new_image;
ExceptionInfo *exception;
AffineMatrix matrix;
image = rm_check_destroyed(self);
// Convert Magick::AffineMatrix to AffineMatrix structure.
Export_AffineMatrix(&matrix, affine);
exception = AcquireExceptionInfo();
new_image = AffineTransformImage(image, &matrix, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#alpha ⇒ Boolean #alpha(value) ⇒ Magick::AlphaChannelOption
Get/Set alpha channel.
-
Replaces #matte=, #alpha=
-
Originally there was an alpha attribute getter and setter. These are replaced with alpha? and alpha(type). We still define (but don’t document) alpha=. For backward compatibility, if this method is called without an argument, make it act like the old alpha getter and return true if the matte channel is active, false otherwise.
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# File 'ext/RMagick/rmimage.c', line 631
VALUE
Image_alpha(int argc, VALUE *argv, VALUE self)
{
Image *image;
AlphaChannelOption alpha;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
// For backward compatibility, make alpha() act like alpha?
if (argc == 0)
{
return Image_alpha_q(self);
}
else if (argc > 1)
{
rb_raise(rb_eArgError, "wrong number of arguments (%d for 1)", argc);
}
image = rm_check_frozen(self);
VALUE_TO_ENUM(argv[0], alpha, AlphaChannelOption);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
SetImageAlphaChannel(image, alpha, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
SetImageAlphaChannel(image, alpha);
rm_check_image_exception(image, RetainOnError);
#endif
return argv[0];
}
|
#alpha? ⇒ Boolean
Determine whether the image’s alpha channel is activated.
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# File 'ext/RMagick/rmimage.c', line 675
VALUE
Image_alpha_q(VALUE self)
{
Image *image = rm_check_destroyed(self);
#if defined(IMAGEMAGICK_7)
return image->alpha_trait == BlendPixelTrait ? Qtrue : Qfalse;
#else
return GetImageAlphaChannel(image) ? Qtrue : Qfalse;
#endif
}
|
#annotate(draw, width, height, x, y, text, &block) ⇒ Object
Provide an alternate version of Draw#annotate, for folks who want to find it in this class.
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# File 'lib/rmagick_internal.rb', line 823 def annotate(draw, width, height, x, y, text, &block) check_destroyed draw.annotate(self, width, height, x, y, text, &block) self end |
#auto_gamma_channel(channel = Magick::AllChannels) ⇒ Magick::Image #auto_gamma_channel(*channels) ⇒ Magick::Image
“Automagically” adjust the gamma level of an image.
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# File 'ext/RMagick/rmimage.c', line 922
VALUE
Image_auto_gamma_channel(int argc, VALUE *argv, VALUE self)
{
#if defined(IMAGEMAGICK_7)
return auto_channel(argc, argv, self, AutoGammaImage);
#else
return auto_channel(argc, argv, self, AutoGammaImageChannel);
#endif
}
|
#auto_level_channel(channel = Magick::AllChannels) ⇒ Magick::Image #auto_level_channel(*channels) ⇒ Magick::Image
“Automagically” adjust the color levels of an image.
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# File 'ext/RMagick/rmimage.c', line 944
VALUE
Image_auto_level_channel(int argc, VALUE *argv, VALUE self)
{
#if defined(IMAGEMAGICK_7)
return auto_channel(argc, argv, self, AutoLevelImage);
#else
return auto_channel(argc, argv, self, AutoLevelImageChannel);
#endif
}
|
#auto_orient ⇒ Magick::Image
Rotates or flips the image based on the image’s EXIF orientation tag.
Note that only some models of modern digital cameras can tag an image with the orientation. If the image does not have an orientation tag, or the image is already properly oriented, then #auto_orient returns an exact copy of the image.
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# File 'ext/RMagick/rmimage.c', line 1033
VALUE
Image_auto_orient(VALUE self)
{
rm_check_destroyed(self);
return auto_orient(False, self);
}
|
#auto_orient! ⇒ Magick::Image?
Rotates or flips the image based on the image’s EXIF orientation tag. Note that only some models of modern digital cameras can tag an image with the orientation. If the image does not have an orientation tag, or the image is already properly oriented, then #auto_orient! returns nil.
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# File 'ext/RMagick/rmimage.c', line 1050
VALUE
Image_auto_orient_bang(VALUE self)
{
rm_check_frozen(self);
return auto_orient(True, self);
}
|
#background_color ⇒ String
Return the name of the background color as a String.
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# File 'ext/RMagick/rmimage.c', line 1063
VALUE
Image_background_color(VALUE self)
{
Image *image = rm_check_destroyed(self);
return rm_pixelcolor_to_color_name(image, &image->background_color);
}
|
#background_color=(color) ⇒ Magick::Pixel, String
Set the the background color to the specified color spec.
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# File 'ext/RMagick/rmimage.c', line 1077
VALUE
Image_background_color_eq(VALUE self, VALUE color)
{
Image *image = rm_check_frozen(self);
Color_to_PixelColor(&image->background_color, color);
return color;
}
|
#base_columns ⇒ Numeric
Return the number of rows (before transformations).
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# File 'ext/RMagick/rmimage.c', line 1091
VALUE
Image_base_columns(VALUE self)
{
Image *image = rm_check_destroyed(self);
return INT2FIX(image->magick_columns);
}
|
#base_filename ⇒ String
Return the image filename (before transformations).
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# File 'ext/RMagick/rmimage.c', line 1103
VALUE
Image_base_filename(VALUE self)
{
Image *image = rm_check_destroyed(self);
if (*image->magick_filename)
{
return rb_str_new2(image->magick_filename);
}
else
{
return rb_str_new2(image->filename);
}
}
|
#base_rows ⇒ Numeric
Return the number of rows (before transformations).
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# File 'ext/RMagick/rmimage.c', line 1122
VALUE
Image_base_rows(VALUE self)
{
Image *image = rm_check_destroyed(self);
return INT2FIX(image->magick_rows);
}
|
#bias ⇒ Float
Get image bias (used when convolving an image).
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# File 'ext/RMagick/rmimage.c', line 1135
VALUE
Image_bias(VALUE self)
{
Image *image;
double bias = 0.0;
image = rm_check_destroyed(self);
#if defined(IMAGEMAGICK_7)
{
const char *artifact = GetImageArtifact(image, "convolve:bias");
if (artifact != (const char *) NULL)
{
char *q;
bias = InterpretLocaleValue(artifact, &q);
if (*q == '%')
{
bias *= ((double) QuantumRange + 1.0) / 100.0;
}
}
}
#else
bias = image->bias;
#endif
return rb_float_new(bias);
}
|
#bias=(pct) ⇒ Float, String
Set image bias (used when convolving an image).
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# File 'ext/RMagick/rmimage.c', line 1169
VALUE
Image_bias_eq(VALUE self, VALUE pct)
{
Image *image;
double bias;
image = rm_check_frozen(self);
bias = rm_percentage(pct, 1.0) * QuantumRange;
#if defined(IMAGEMAGICK_7)
{
char artifact[21];
snprintf(artifact, sizeof(artifact), "%.20g", bias);
SetImageArtifact(image, "convolve:bias", artifact);
}
#else
image->bias = bias;
#endif
return pct;
}
|
#bilevel_channel(threshold, channel = Magick::AllChannels) ⇒ Magick::Image #bilevel_channel(threshold, *channels) ⇒ Magick::Image
Changes the value of individual pixels based on the intensity of each pixel channel. The result is a high-contrast image.
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# File 'ext/RMagick/rmimage.c', line 1205
VALUE
Image_bilevel_channel(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
ChannelType channels;
double threshold;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
if (argc > 1)
{
raise_ChannelType_error(argv[argc-1]);
}
if (argc == 0)
{
rb_raise(rb_eArgError, "no threshold specified");
}
threshold = NUM2DBL(argv[0]);
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
BEGIN_CHANNEL_MASK(new_image, channels);
BilevelImage(new_image, threshold, exception);
END_CHANNEL_MASK(new_image);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
BilevelImageChannel(new_image, channels, threshold);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#black_point_compensation ⇒ Boolean
Return current black point compensation attribute.
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# File 'ext/RMagick/rmimage.c', line 1251
VALUE
Image_black_point_compensation(VALUE self)
{
Image *image;
const char *attr;
VALUE value;
image = rm_check_destroyed(self);
attr = rm_get_property(image, BlackPointCompensationKey);
if (attr && rm_strcasecmp(attr, "true") == 0)
{
value = Qtrue;
}
else
{
value = Qfalse;
}
RB_GC_GUARD(value);
return value;
}
|
#black_point_compensation=(arg) ⇒ Boolean
Set black point compensation attribute.
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# File 'ext/RMagick/rmimage.c', line 1282
VALUE
Image_black_point_compensation_eq(VALUE self, VALUE arg)
{
Image *image;
const char *value;
image = rm_check_frozen(self);
rm_set_property(image, BlackPointCompensationKey, NULL);
value = RTEST(arg) ? "true" : "false";
rm_set_property(image, BlackPointCompensationKey, value);
return arg;
}
|
#black_threshold(red) ⇒ Numeric #black_threshold(red, green) ⇒ Numeric #black_threshold(red, green, blue) ⇒ Numeric #black_threshold(red, green, blue, alpha: ) ⇒ Numeric
Forces all pixels below the threshold into black while leaving all pixels above the threshold unchanged.
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# File 'ext/RMagick/rmimage.c', line 1322
VALUE
Image_black_threshold(int argc, VALUE *argv, VALUE self)
{
return threshold_image(argc, argv, self, BlackThresholdImage);
}
|
#blend(overlay, src_percent, dst_percent, gravity = Magick::NorthWestGravity, x_offset = 0, y_offset = 0) ⇒ Magick::Image
Adds the overlay image to the target image according to src_percent and dst_percent.
-
The default value for dst_percent is 100%-src_percent
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# File 'ext/RMagick/rmimage.c', line 1668
VALUE
Image_blend(int argc, VALUE *argv, VALUE self)
{
VALUE ovly;
Image *image, *overlay;
double src_percent, dst_percent;
long x_offset = 0L, y_offset = 0L;
image = rm_check_destroyed(self);
if (argc < 1)
{
rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 to 6)", argc);
}
ovly = rm_cur_image(argv[0]);
overlay = rm_check_destroyed(ovly);
if (argc > 3)
{
get_composite_offsets(argc-3, &argv[3], image, overlay, &x_offset, &y_offset);
// There must be 3 arguments left
argc = 3;
}
switch (argc)
{
case 3:
dst_percent = rm_percentage(argv[2], 1.0) * 100.0;
src_percent = rm_percentage(argv[1], 1.0) * 100.0;
break;
case 2:
src_percent = rm_percentage(argv[1], 1.0) * 100.0;
dst_percent = FMAX(100.0 - src_percent, 0);
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 to 6)", argc);
break;
}
RB_GC_GUARD(ovly);
return special_composite(image, overlay, src_percent, dst_percent,
x_offset, y_offset, BlendCompositeOp);
}
|
#blue_shift(factor = 1.5) ⇒ Magick::Image
Simulate a scene at nighttime in the moonlight.
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# File 'ext/RMagick/rmimage.c', line 1724
VALUE
Image_blue_shift(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
double factor = 1.5;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
switch (argc)
{
case 1:
factor = NUM2DBL(argv[0]);
case 0:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
break;
}
exception = AcquireExceptionInfo();
new_image = BlueShiftImage(image, factor, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#blur_channel(radius = 0.0, sigma = 1.0, channel = Magick::AllChannels) ⇒ Magick::Image #blur_channel(radius = 0.0, sigma = 1.0, *channels) ⇒ Magick::Image
Blurs the specified channel. Convolves the image with a Gaussian operator of the given radius and standard deviation (sigma).
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# File 'ext/RMagick/rmimage.c', line 1770
VALUE
Image_blur_channel(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
ExceptionInfo *exception;
ChannelType channels;
double radius = 0.0, sigma = 1.0;
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
// There can be 0, 1, or 2 remaining arguments.
switch (argc)
{
case 2:
sigma = NUM2DBL(argv[1]);
case 1:
radius = NUM2DBL(argv[0]);
case 0:
break;
default:
raise_ChannelType_error(argv[argc-1]);
}
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
BEGIN_CHANNEL_MASK(image, channels);
new_image = BlurImage(image, radius, sigma, exception);
CHANGE_RESULT_CHANNEL_MASK(new_image);
END_CHANNEL_MASK(image);
#else
new_image = BlurImageChannel(image, channels, radius, sigma, exception);
#endif
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#blur_image(radius = 0.0, sigma = 1.0) ⇒ Magick::Image
Blur the image.
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# File 'ext/RMagick/rmimage.c', line 1819
VALUE
Image_blur_image(int argc, VALUE *argv, VALUE self)
{
return effect_image(self, argc, argv, BlurImage);
}
|
#border(width, height, color) ⇒ Magick::Image
Surrounds the image with a border of the specified width, height, and named color.
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# File 'ext/RMagick/rmimage.c', line 1905
VALUE
Image_border(VALUE self, VALUE width, VALUE height, VALUE color)
{
rm_check_destroyed(self);
return border(False, self, width, height, color);
}
|
#border!(width, height, color) ⇒ Object
Surrounds the image with a border of the specified width, height, and named color. In-place form of #border.
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# File 'ext/RMagick/rmimage.c', line 1889
VALUE
Image_border_bang(VALUE self, VALUE width, VALUE height, VALUE color)
{
rm_check_frozen(self);
return border(True, self, width, height, color);
}
|
#border_color ⇒ String
Return the name of the border color as a String.
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# File 'ext/RMagick/rmimage.c', line 1918
VALUE
Image_border_color(VALUE self)
{
Image *image = rm_check_destroyed(self);
return rm_pixelcolor_to_color_name(image, &image->border_color);
}
|
#border_color=(color) ⇒ Magick::Pixel, String
Set the the border color.
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# File 'ext/RMagick/rmimage.c', line 1932
VALUE
Image_border_color_eq(VALUE self, VALUE color)
{
Image *image = rm_check_frozen(self);
Color_to_PixelColor(&image->border_color, color);
return color;
}
|
#bounding_box ⇒ Magick::Rectangle
Returns the bounding box of an image canvas.
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# File 'ext/RMagick/rmimage.c', line 1946
VALUE
Image_bounding_box(VALUE self)
{
Image *image;
RectangleInfo box;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
exception = AcquireExceptionInfo();
box = GetImageBoundingBox(image, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
return Import_RectangleInfo(&box);
}
|
#change_geometry(geom_arg) {|column, row, image| ... } ⇒ Object
#change_geometry! is an alias for #change_geometry.
This method supports resizing a method by specifying constraints. For example, you can specify that the image should be resized such that the aspect ratio should be retained but the resulting image should be no larger than 640 pixels wide and 480 pixels tall.
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# File 'ext/RMagick/rmimage.c', line 2078
VALUE
Image_change_geometry(VALUE self, VALUE geom_arg)
{
Image *image;
RectangleInfo rect;
VALUE geom_str;
char *geometry;
unsigned int flags;
VALUE ary;
image = rm_check_destroyed(self);
geom_str = rb_String(geom_arg);
geometry = StringValueCStr(geom_str);
memset(&rect, 0, sizeof(rect));
SetGeometry(image, &rect);
flags = ParseMetaGeometry(geometry, &rect.x, &rect.y, &rect.width, &rect.height);
if (flags == NoValue)
{
rb_raise(rb_eArgError, "invalid geometry string `%s'", geometry);
}
ary = rb_ary_new2(3);
rb_ary_store(ary, 0, ULONG2NUM(rect.width));
rb_ary_store(ary, 1, ULONG2NUM(rect.height));
rb_ary_store(ary, 2, self);
RB_GC_GUARD(geom_str);
RB_GC_GUARD(ary);
return rb_yield(ary);
}
|
#change_geometry!(geom_arg) {|column, row, image| ... } ⇒ Object
#change_geometry! is an alias for #change_geometry.
This method supports resizing a method by specifying constraints. For example, you can specify that the image should be resized such that the aspect ratio should be retained but the resulting image should be no larger than 640 pixels wide and 480 pixels tall.
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# File 'ext/RMagick/rmimage.c', line 2078
VALUE
Image_change_geometry(VALUE self, VALUE geom_arg)
{
Image *image;
RectangleInfo rect;
VALUE geom_str;
char *geometry;
unsigned int flags;
VALUE ary;
image = rm_check_destroyed(self);
geom_str = rb_String(geom_arg);
geometry = StringValueCStr(geom_str);
memset(&rect, 0, sizeof(rect));
SetGeometry(image, &rect);
flags = ParseMetaGeometry(geometry, &rect.x, &rect.y, &rect.width, &rect.height);
if (flags == NoValue)
{
rb_raise(rb_eArgError, "invalid geometry string `%s'", geometry);
}
ary = rb_ary_new2(3);
rb_ary_store(ary, 0, ULONG2NUM(rect.width));
rb_ary_store(ary, 1, ULONG2NUM(rect.height));
rb_ary_store(ary, 2, self);
RB_GC_GUARD(geom_str);
RB_GC_GUARD(ary);
return rb_yield(ary);
}
|
#changed? ⇒ Boolean
Return true if any pixel in the image has been altered since the image was constituted.
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# File 'ext/RMagick/rmimage.c', line 2118
VALUE
Image_changed_q(VALUE self)
{
Image *image = rm_check_destroyed(self);
VALUE okay = IsTaintImage(image) ? Qtrue : Qfalse;
return okay;
}
|
#channel(channel_arg) ⇒ Magick::Image
Extract a channel from the image. A channel is a particular color component of each pixel in the image.
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# File 'ext/RMagick/rmimage.c', line 2134
VALUE
Image_channel(VALUE self, VALUE channel_arg)
{
Image *image, *new_image;
ChannelType channel;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
VALUE_TO_ENUM(channel_arg, channel, ChannelType);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
new_image = SeparateImage(image, channel, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
new_image = rm_clone_image(image);
SeparateImageChannel(new_image, channel);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#compare_channel(image, metric, channel = Magick::AllChannels) ⇒ Array #compare_channel(image, metric, channel = Magick::AllChannels) { ... } ⇒ Array #compare_channel(image, metric, *channels) ⇒ Array #compare_channel(image, metric, *channels) { ... } ⇒ Array
Compare one or more channels in two images and returns the specified distortion metric and a comparison image.
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# File 'ext/RMagick/rmimage.c', line 3143
VALUE
Image_compare_channel(int argc, VALUE *argv, VALUE self)
{
Image *image, *r_image, *difference_image;
double distortion;
VALUE ary, ref;
MetricType metric_type;
ChannelType channels;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
if (argc > 2)
{
raise_ChannelType_error(argv[argc-1]);
}
if (argc != 2)
{
rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 or more)", argc);
}
rm_get_optional_arguments(self);
ref = rm_cur_image(argv[0]);
r_image = rm_check_destroyed(ref);
VALUE_TO_ENUM(argv[1], metric_type, MetricType);
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
BEGIN_CHANNEL_MASK(image, channels);
difference_image = CompareImages(image, r_image, metric_type, &distortion, exception);
END_CHANNEL_MASK(image);
#else
difference_image = CompareImageChannels(image, r_image, channels, metric_type, &distortion, exception);
#endif
rm_check_exception(exception, difference_image, DestroyOnError);
DestroyExceptionInfo(exception);
ary = rb_ary_new2(2);
rb_ary_store(ary, 0, rm_image_new(difference_image));
rb_ary_store(ary, 1, rb_float_new(distortion));
RB_GC_GUARD(ary);
RB_GC_GUARD(ref);
return ary;
}
|
#channel_depth(channel = Magick::AllChannels) ⇒ Numeric #channel_depth(*channels) ⇒ Numeric
Returns the maximum depth for the specified channel or channels.
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# File 'ext/RMagick/rmimage.c', line 2174
VALUE
Image_channel_depth(int argc, VALUE *argv, VALUE self)
{
Image *image;
ChannelType channels;
unsigned long channel_depth;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
// Ensure all arguments consumed.
if (argc > 0)
{
raise_ChannelType_error(argv[argc-1]);
}
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
BEGIN_CHANNEL_MASK(image, channels);
channel_depth = GetImageDepth(image, exception);
END_CHANNEL_MASK(image);
#else
channel_depth = GetImageChannelDepth(image, channels, exception);
#endif
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
return ULONG2NUM(channel_depth);
}
|
#channel_entropy(*args) ⇒ Object
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# File 'ext/RMagick/rmimage.c', line 2364
VALUE
Image_channel_entropy(int argc ATTRIBUTE_UNUSED, VALUE *argv ATTRIBUTE_UNUSED, VALUE self ATTRIBUTE_UNUSED)
{
rm_not_implemented();
}
|
#channel_extrema(channel = Magick::AllChannels) ⇒ Array<Numeric> #channel_extrema(*channels) ⇒ Array<Numeric>
Returns the minimum and maximum intensity values for the specified channel or channels.
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# File 'ext/RMagick/rmimage.c', line 2220
VALUE
Image_channel_extrema(int argc, VALUE *argv, VALUE self)
{
Image *image;
ChannelType channels;
ExceptionInfo *exception;
size_t min, max;
VALUE ary;
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
// Ensure all arguments consumed.
if (argc > 0)
{
raise_ChannelType_error(argv[argc-1]);
}
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
BEGIN_CHANNEL_MASK(image, channels);
GetImageExtrema(image, &min, &max, exception);
END_CHANNEL_MASK(image);
#else
GetImageChannelExtrema(image, channels, &min, &max, exception);
#endif
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
ary = rb_ary_new2(2);
rb_ary_store(ary, 0, ULONG2NUM(min));
rb_ary_store(ary, 1, ULONG2NUM(max));
RB_GC_GUARD(ary);
return ary;
}
|
#channel_mean(channel = Magick::AllChannels) ⇒ Array<Float> #channel_mean(*channels) ⇒ Array<Float>
Returns the mean and standard deviation values for the specified channel or channels.
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# File 'ext/RMagick/rmimage.c', line 2273
VALUE
Image_channel_mean(int argc, VALUE *argv, VALUE self)
{
Image *image;
ChannelType channels;
ExceptionInfo *exception;
double mean, stddev;
VALUE ary;
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
// Ensure all arguments consumed.
if (argc > 0)
{
raise_ChannelType_error(argv[argc-1]);
}
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
BEGIN_CHANNEL_MASK(image, channels);
GetImageMean(image, &mean, &stddev, exception);
END_CHANNEL_MASK(image);
#else
GetImageChannelMean(image, channels, &mean, &stddev, exception);
#endif
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
ary = rb_ary_new2(2);
rb_ary_store(ary, 0, rb_float_new(mean));
rb_ary_store(ary, 1, rb_float_new(stddev));
RB_GC_GUARD(ary);
return ary;
}
|
#charcoal(radius = 0.0, sigma = 1.0) ⇒ Magick::Image
Return a new image that is a copy of the input image with the edges highlighted.
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# File 'ext/RMagick/rmimage.c', line 2379
VALUE
Image_charcoal(int argc, VALUE *argv, VALUE self)
{
return effect_image(self, argc, argv, CharcoalImage);
}
|
#check_destroyed ⇒ nil
Raises DestroyedImageError if the image has been destroyed. Returns nil otherwise.
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# File 'ext/RMagick/rmimage.c', line 2392
VALUE
Image_check_destroyed(VALUE self)
{
rm_check_destroyed(self);
return Qnil;
}
|
#chop(x, y, width, height) ⇒ Magick::Image
Remove a region of an image and collapses the image to occupy the removed portion.
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# File 'ext/RMagick/rmimage.c', line 2409
VALUE
Image_chop(VALUE self, VALUE x, VALUE y, VALUE width, VALUE height)
{
rm_check_destroyed(self);
return xform_image(False, self, x, y, width, height, ChopImage);
}
|
#chromaticity ⇒ Magick::Chromaticity
Return the red, green, blue, and white-point chromaticity values as a Chromaticity.
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# File 'ext/RMagick/rmimage.c', line 2422
VALUE
Image_chromaticity(VALUE self)
{
Image *image = rm_check_destroyed(self);
return ChromaticityInfo_new(&image->chromaticity);
}
|
#chromaticity=(chroma) ⇒ Magick::Chromaticity
Set the red, green, blue, and white-point chromaticity values from a Chromaticity.
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# File 'ext/RMagick/rmimage.c', line 2436
VALUE
Image_chromaticity_eq(VALUE self, VALUE chroma)
{
Image *image = rm_check_frozen(self);
Export_ChromaticityInfo(&image->chromaticity, chroma);
return chroma;
}
|
#class_type ⇒ Magick::ClassType
Return the image’s storage class (a.k.a. storage type, class type). If DirectClass then the pixels contain valid RGB or CMYK colors. If PseudoClass then the image has a colormap referenced by the pixel’s index member.
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# File 'ext/RMagick/rmimage.c', line 13245
VALUE
Image_class_type(VALUE self)
{
Image *image = rm_check_destroyed(self);
return ClassType_find(image->storage_class);
}
|
#class_type=(new_class_type) ⇒ Magick::ClassType
Change the image’s storage class.
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# File 'ext/RMagick/rmimage.c', line 13259
VALUE
Image_class_type_eq(VALUE self, VALUE new_class_type)
{
Image *image;
ClassType class_type;
QuantizeInfo qinfo;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_frozen(self);
VALUE_TO_ENUM(new_class_type, class_type, ClassType);
if (class_type == UndefinedClass)
{
rb_raise(rb_eArgError, "Invalid class type specified.");
}
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
#endif
if (image->storage_class == PseudoClass && class_type == DirectClass)
{
#if defined(IMAGEMAGICK_7)
SyncImage(image, exception);
CHECK_EXCEPTION();
#else
SyncImage(image);
#endif
magick_free(image->colormap);
image->colormap = NULL;
}
else if (image->storage_class == DirectClass && class_type == PseudoClass)
{
GetQuantizeInfo(&qinfo);
qinfo.number_colors = QuantumRange+1;
#if defined(IMAGEMAGICK_7)
QuantizeImage(&qinfo, image, exception);
CHECK_EXCEPTION();
#else
QuantizeImage(&qinfo, image);
#endif
}
#if defined(IMAGEMAGICK_7)
SetImageStorageClass(image, class_type, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
SetImageStorageClass(image, class_type);
#endif
return new_class_type;
}
|
#clone ⇒ Magick::Image
Same as #dup except the frozen state of the original is propagated to the new copy.
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# File 'ext/RMagick/rmimage.c', line 2451
VALUE
Image_clone(VALUE self)
{
VALUE clone;
clone = Image_dup(self);
if (OBJ_FROZEN(self))
{
OBJ_FREEZE(clone);
}
RB_GC_GUARD(clone);
return clone;
}
|
#clut_channel(clut_image, channel = Magick::AllChannels) ⇒ Magick::Image #clut_channel(clut_image, *channels) ⇒ Magick::Image
Replace the channel values in the target image with a lookup of its replacement value in an LUT gradient image.
The LUT image should be either a single row or column image of replacement colors. The lookup is controlled by the -interpolate setting, especially for an LUT which is not the full length needed by the IM installed Quality (Q) level. Good settings for this is the default ‘bilinear’ or ‘bicubic’ interpolation setting for a smooth color gradient, or ‘integer’ for a direct unsmoothed lookup of color values.
This method is especially suited to replacing a grayscale image with specific color gradient from the CLUT image.
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# File 'ext/RMagick/rmimage.c', line 2491
VALUE
Image_clut_channel(int argc, VALUE *argv, VALUE self)
{
Image *image, *clut;
ChannelType channels;
MagickBooleanType okay;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_frozen(self);
// check_destroyed before confirming the arguments
if (argc >= 1)
{
rm_check_destroyed(argv[0]);
channels = extract_channels(&argc, argv);
if (argc != 1)
{
rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 or more)", argc);
}
}
else
{
rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 or more)", argc);
}
Data_Get_Struct(argv[0], Image, clut);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
BEGIN_CHANNEL_MASK(image, channels);
okay = ClutImage(image, clut, image->interpolate, exception);
END_CHANNEL_MASK(image);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
okay = ClutImageChannel(image, channels, clut);
rm_check_image_exception(image, RetainOnError);
rm_check_image_exception(clut, RetainOnError);
#endif
if (!okay)
{
rb_raise(rb_eRuntimeError, "ClutImageChannel failed.");
}
return self;
}
|
#color_fill_to_border(x, y, fill) ⇒ Object
Set all pixels that are neighbors of x,y and are not the border color to the fill color
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# File 'lib/rmagick_internal.rb', line 845 def color_fill_to_border(x, y, fill) color_flood_fill(border_color, fill, x, y, Magick::FillToBorderMethod) end |
#color_flood_fill(target_color, fill_color, xv, yv, method) ⇒ Magick::Image
Change the color value of any pixel that matches target_color and is an immediate neighbor.
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# File 'ext/RMagick/rmimage.c', line 2785
VALUE
Image_color_flood_fill(VALUE self, VALUE target_color, VALUE fill_color,
VALUE xv, VALUE yv, VALUE method)
{
Image *image, *new_image;
PixelColor target;
DrawInfo *draw_info;
PixelColor fill;
long x, y;
int fill_method;
MagickPixel target_mpp;
MagickBooleanType invert;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
// The target and fill args can be either a color name or
// a Magick::Pixel.
Color_to_PixelColor(&target, target_color);
Color_to_PixelColor(&fill, fill_color);
x = NUM2LONG(xv);
y = NUM2LONG(yv);
if ((unsigned long)x > image->columns || (unsigned long)y > image->rows)
{
rb_raise(rb_eArgError, "target out of range. %lux%lu given, image is %"RMIuSIZE"x%"RMIuSIZE"",
x, y, image->columns, image->rows);
}
VALUE_TO_ENUM(method, fill_method, PaintMethod);
if (!(fill_method == FloodfillMethod || fill_method == FillToBorderMethod))
{
rb_raise(rb_eArgError, "paint method must be FloodfillMethod or "
"FillToBorderMethod (%d given)", fill_method);
}
draw_info = CloneDrawInfo(NULL, NULL);
if (!draw_info)
{
rb_raise(rb_eNoMemError, "not enough memory to continue");
}
draw_info->fill = fill;
new_image = rm_clone_image(image);
rm_init_magickpixel(new_image, &target_mpp);
if (fill_method == FillToBorderMethod)
{
invert = MagickTrue;
target_mpp.red = (MagickRealType) image->border_color.red;
target_mpp.green = (MagickRealType) image->border_color.green;
target_mpp.blue = (MagickRealType) image->border_color.blue;
}
else
{
invert = MagickFalse;
target_mpp.red = (MagickRealType) target.red;
target_mpp.green = (MagickRealType) target.green;
target_mpp.blue = (MagickRealType) target.blue;
}
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
FloodfillPaintImage(new_image, draw_info, &target_mpp, x, y, invert, exception);
DestroyDrawInfo(draw_info);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
FloodfillPaintImage(new_image, DefaultChannels, draw_info, &target_mpp, x, y, invert);
DestroyDrawInfo(draw_info);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#color_floodfill(x, y, fill) ⇒ Object
Set all pixels that have the same color as the pixel at x,y and are neighbors to the fill color
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# File 'lib/rmagick_internal.rb', line 838 def color_floodfill(x, y, fill) target = pixel_color(x, y) color_flood_fill(target, fill, x, y, Magick::FloodfillMethod) end |
#color_histogram ⇒ Hash
Computes the number of times each unique color appears in the image.
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# File 'ext/RMagick/rmimage.c', line 2547
VALUE
Image_color_histogram(VALUE self)
{
Image *image, *dc_copy = NULL;
VALUE hash, pixel;
size_t x, colors;
ExceptionInfo *exception;
#if defined(IMAGEMAGICK_7)
PixelInfo *histogram;
#else
ColorPacket *histogram;
#endif
image = rm_check_destroyed(self);
exception = AcquireExceptionInfo();
// If image not DirectClass make a DirectClass copy.
if (image->storage_class != DirectClass)
{
dc_copy = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
SetImageStorageClass(dc_copy, DirectClass, exception);
#else
SetImageStorageClass(dc_copy, DirectClass);
#endif
image = dc_copy;
}
histogram = GetImageHistogram(image, &colors, exception);
if (histogram == NULL)
{
if (dc_copy)
{
DestroyImage(dc_copy);
}
rb_raise(rb_eNoMemError, "not enough memory to continue");
}
if (rm_should_raise_exception(exception, DestroyExceptionRetention))
{
RelinquishMagickMemory(histogram);
if (dc_copy)
{
DestroyImage(dc_copy);
}
rm_raise_exception(exception);
}
hash = rb_hash_new();
for (x = 0; x < colors; x++)
{
#if defined(IMAGEMAGICK_7)
pixel = Pixel_from_PixelColor(&histogram[x]);
#else
pixel = Pixel_from_PixelColor(&histogram[x].pixel);
#endif
rb_hash_aset(hash, pixel, ULONG2NUM((unsigned long)histogram[x].count));
}
/*
Christy evidently didn't agree with Bob's memory management.
*/
RelinquishMagickMemory(histogram);
if (dc_copy)
{
// Do not trace destruction
DestroyImage(dc_copy);
}
RB_GC_GUARD(hash);
RB_GC_GUARD(pixel);
return hash;
}
|
#color_point(x, y, fill) ⇒ Object
Set the color at x,y
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# File 'lib/rmagick_internal.rb', line 830 def color_point(x, y, fill) f = copy f.pixel_color(x, y, fill) f end |
#color_profile ⇒ String?
Return the ICC color profile as a String.
-
If there is no profile, returns “”
-
This method has no real use but is retained for compatibility with earlier releases of RMagick, where it had no real use either.
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# File 'ext/RMagick/rmimage.c', line 2735
VALUE
Image_color_profile(VALUE self)
{
Image *image;
const StringInfo *profile;
image = rm_check_destroyed(self);
profile = GetImageProfile(image, "icc");
if (!profile)
{
return Qnil;
}
return rb_str_new((char *)profile->datum, (long)profile->length);
}
|
#color_profile=(profile) ⇒ String
Set the ICC color profile.
-
Pass nil to remove any existing profile.
-
Removes any existing profile before adding the new one.
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# File 'ext/RMagick/rmimage.c', line 2762
VALUE
Image_color_profile_eq(VALUE self, VALUE profile)
{
Image_delete_profile(self, rb_str_new2("ICC"));
if (profile != Qnil)
{
set_profile(self, "ICC", profile);
}
return profile;
}
|
#color_reset!(fill) ⇒ Object
Set all pixels to the fill color. Very similar to Image#erase! Accepts either String or Pixel arguments
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# File 'lib/rmagick_internal.rb', line 851 def color_reset!(fill) save = background_color # Change the background color _outside_ the begin block # so that if this object is frozen the exeception will be # raised before we have to handle it explicitly. self.background_color = fill begin erase! ensure self.background_color = save end self end |
#colorize(red, green, blue, target) ⇒ Magick::Image #colorize(red, green, blue, matte, target) ⇒ Magick::Image
Blend the fill color specified by “target” with each pixel in the image. Specify the percentage blend for each r, g, b component.
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# File 'ext/RMagick/rmimage.c', line 2884
VALUE
Image_colorize(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
double red, green, blue, matte;
char opacity[50];
PixelColor target;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
if (argc == 4)
{
red = floor(100*NUM2DBL(argv[0])+0.5);
green = floor(100*NUM2DBL(argv[1])+0.5);
blue = floor(100*NUM2DBL(argv[2])+0.5);
Color_to_PixelColor(&target, argv[3]);
snprintf(opacity, sizeof(opacity), "%f/%f/%f", red, green, blue);
}
else if (argc == 5)
{
red = floor(100*NUM2DBL(argv[0])+0.5);
green = floor(100*NUM2DBL(argv[1])+0.5);
blue = floor(100*NUM2DBL(argv[2])+0.5);
matte = floor(100*NUM2DBL(argv[3])+0.5);
Color_to_PixelColor(&target, argv[4]);
snprintf(opacity, sizeof(opacity), "%f/%f/%f/%f", red, green, blue, matte);
}
else
{
rb_raise(rb_eArgError, "wrong number of arguments (%d for 4 or 5)", argc);
}
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
new_image = ColorizeImage(image, opacity, &target, exception);
#else
new_image = ColorizeImage(image, opacity, target, exception);
#endif
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#colormap(index) ⇒ String #colormap(index, new_color) ⇒ String
Return the color in the colormap at the specified index. If a new color is specified, replaces the color at the index with the new color.
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# File 'ext/RMagick/rmimage.c', line 2947
VALUE
Image_colormap(int argc, VALUE *argv, VALUE self)
{
Image *image;
unsigned long idx;
PixelColor color, new_color;
image = rm_check_destroyed(self);
// We can handle either 1 or 2 arguments. Nothing else.
if (argc == 0 || argc > 2)
{
rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 or 2)", argc);
}
idx = NUM2ULONG(argv[0]);
if (idx > QuantumRange)
{
rb_raise(rb_eIndexError, "index out of range");
}
// If this is a simple "get" operation, ensure the image has a colormap.
if (argc == 1)
{
if (!image->colormap)
{
rb_raise(rb_eIndexError, "image does not contain a colormap");
}
// Validate the index
if (idx > image->colors-1)
{
rb_raise(rb_eIndexError, "index out of range");
}
return rm_pixelcolor_to_color_name(image, &image->colormap[idx]);
}
// This is a "set" operation. Things are different.
rb_check_frozen(self);
// Replace with new color? The arg can be either a color name or
// a Magick::Pixel.
Color_to_PixelColor(&new_color, argv[1]);
// Handle no colormap or current colormap too small.
if (!image->colormap || idx > image->colors-1)
{
PixelColor black;
unsigned long i;
memset(&black, 0, sizeof(black));
if (!image->colormap)
{
image->colormap = (PixelColor *)magick_safe_malloc((idx+1), sizeof(PixelColor));
image->colors = 0;
}
else
{
image->colormap = (PixelColor *)magick_safe_realloc(image->colormap, (idx+1), sizeof(PixelColor));
}
for (i = image->colors; i < idx; i++)
{
image->colormap[i] = black;
}
image->colors = idx+1;
}
// Save the current color so we can return it. Set the new color.
color = image->colormap[idx];
image->colormap[idx] = new_color;
return rm_pixelcolor_to_color_name(image, &color);
}
|
#colors ⇒ Numeric
Get the number of colors in the colormap.
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# File 'ext/RMagick/rmimage.c', line 3029
VALUE
Image_colors(VALUE self)
{
IMPLEMENT_ATTR_READER(Image, colors, ulong);
}
|
#colorspace ⇒ Magick::ColorspaceType
Return the Image pixel interpretation. If the colorspace is RGB the pixels are red, green, blue. If matte is true, then red, green, blue, and index. If it is CMYK, the pixels are cyan, yellow, magenta, black. Otherwise the colorspace is ignored.
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# File 'ext/RMagick/rmimage.c', line 3042
VALUE
Image_colorspace(VALUE self)
{
Image *image;
image = rm_check_destroyed(self);
return ColorspaceType_find(image->colorspace);
}
|
#colorspace=(colorspace) ⇒ Magick::ColorspaceType
Set the image’s colorspace.
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# File 'ext/RMagick/rmimage.c', line 3058
VALUE
Image_colorspace_eq(VALUE self, VALUE colorspace)
{
Image *image;
ColorspaceType new_cs;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_frozen(self);
VALUE_TO_ENUM(colorspace, new_cs, ColorspaceType);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
TransformImageColorspace(image, new_cs, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
TransformImageColorspace(image, new_cs);
rm_check_image_exception(image, RetainOnError);
#endif
return colorspace;
}
|
#columns ⇒ Numeric
Get image columns.
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# File 'ext/RMagick/rmimage.c', line 3089
VALUE
Image_columns(VALUE self)
{
IMPLEMENT_ATTR_READER(Image, columns, int);
}
|
#compare_channel(image, metric, channel = Magick::AllChannels) ⇒ Array #compare_channel(image, metric, channel = Magick::AllChannels) { ... } ⇒ Array #compare_channel(image, metric, *channels) ⇒ Array #compare_channel(image, metric, *channels) { ... } ⇒ Array
Compare one or more channels in two images and returns the specified distortion metric and a comparison image.
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# File 'ext/RMagick/rmimage.c', line 3143
VALUE
Image_compare_channel(int argc, VALUE *argv, VALUE self)
{
Image *image, *r_image, *difference_image;
double distortion;
VALUE ary, ref;
MetricType metric_type;
ChannelType channels;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
if (argc > 2)
{
raise_ChannelType_error(argv[argc-1]);
}
if (argc != 2)
{
rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 or more)", argc);
}
rm_get_optional_arguments(self);
ref = rm_cur_image(argv[0]);
r_image = rm_check_destroyed(ref);
VALUE_TO_ENUM(argv[1], metric_type, MetricType);
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
BEGIN_CHANNEL_MASK(image, channels);
difference_image = CompareImages(image, r_image, metric_type, &distortion, exception);
END_CHANNEL_MASK(image);
#else
difference_image = CompareImageChannels(image, r_image, channels, metric_type, &distortion, exception);
#endif
rm_check_exception(exception, difference_image, DestroyOnError);
DestroyExceptionInfo(exception);
ary = rb_ary_new2(2);
rb_ary_store(ary, 0, rm_image_new(difference_image));
rb_ary_store(ary, 1, rb_float_new(distortion));
RB_GC_GUARD(ary);
RB_GC_GUARD(ref);
return ary;
}
|
#compose ⇒ Magick::CompositeOperator
Return the composite operator attribute.
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# File 'ext/RMagick/rmimage.c', line 3200
VALUE
Image_compose(VALUE self)
{
Image *image = rm_check_destroyed(self);
return CompositeOperator_find(image->compose);
}
|
#compose=(compose_arg) ⇒ Magick::CompositeOperator
Set the composite operator attribute.
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# File 'ext/RMagick/rmimage.c', line 3214
VALUE
Image_compose_eq(VALUE self, VALUE compose_arg)
{
Image *image = rm_check_frozen(self);
VALUE_TO_ENUM(compose_arg, image->compose, CompositeOperator);
return compose_arg;
}
|
#composite(image, x_off, y_off, composite_op) ⇒ Magick::Image #composite(image, gravity, composite_op) ⇒ Magick::Image #composite(image, gravity, x_off, y_off, composite_op) ⇒ Magick::Image
Composites src onto dest using the specified composite operator.
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# File 'ext/RMagick/rmimage.c', line 3483
VALUE
Image_composite(int argc, VALUE *argv, VALUE self)
{
return composite(False, argc, argv, self, DefaultChannels);
}
|
#composite!(image, x_off, y_off, composite_op) ⇒ Magick::Image #composite!(image, gravity, composite_op) ⇒ Magick::Image #composite!(image, gravity, x_off, y_off, composite_op) ⇒ Magick::Image
Composites src onto dest using the specified composite operator. In-place form of #composite.
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# File 'ext/RMagick/rmimage.c', line 3443
VALUE
Image_composite_bang(int argc, VALUE *argv, VALUE self)
{
return composite(True, argc, argv, self, DefaultChannels);
}
|
#composite_affine(source, affine_matrix) ⇒ Magick::Image
Composite the source over the destination image as dictated by the affine transform.
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# File 'ext/RMagick/rmimage.c', line 3497
VALUE
Image_composite_affine(VALUE self, VALUE source, VALUE affine_matrix)
{
Image *image, *composite_image, *new_image;
AffineMatrix affine;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
composite_image = rm_check_destroyed(source);
Export_AffineMatrix(&affine, affine_matrix);
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
DrawAffineImage(new_image, composite_image, &affine, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
DrawAffineImage(new_image, composite_image, &affine);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#composite_channel(image, x_off, y_off, composite_op, channel = Magick::AllChannels) ⇒ Magick::Image #composite_channel(image, x_off, y_off, composite_op, *channels) ⇒ Magick::Image #composite_channel(image, gravity, composite_op, channel = Magick::AllChannels) ⇒ Magick::Image #composite_channel(image, gravity, composite_op, *channels) ⇒ Magick::Image #composite_channel(image, gravity, x_off, y_off, composite_op, channel = Magick::AllChannels) ⇒ Magick::Image #composite_channel(image, gravity, x_off, y_off, composite_op, *channels) ⇒ Magick::Image
Composite the source over the destination image channel as dictated by the affine transform.
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# File 'ext/RMagick/rmimage.c', line 3631
VALUE
Image_composite_channel(int argc, VALUE *argv, VALUE self)
{
return composite_channel(False, argc, argv, self);
}
|
#composite_channel!(image, x_off, y_off, composite_op, channel = Magick::AllChannels) ⇒ Magick::Image #composite_channel!(image, x_off, y_off, composite_op, *channels) ⇒ Magick::Image #composite_channel!(image, gravity, composite_op, channel = Magick::AllChannels) ⇒ Magick::Image #composite_channel!(image, gravity, composite_op, *channels) ⇒ Magick::Image #composite_channel!(image, gravity, x_off, y_off, composite_op, channel = Magick::AllChannels) ⇒ Magick::Image #composite_channel!(image, gravity, x_off, y_off, composite_op, *channels) ⇒ Magick::Image
Composite the source over the destination image channel as dictated by the affine transform. In-place form of #composite_channel.
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# File 'ext/RMagick/rmimage.c', line 3706
VALUE
Image_composite_channel_bang(int argc, VALUE *argv, VALUE self)
{
return composite_channel(True, argc, argv, self);
}
|
#composite_mathematics(image, a, b, c, d, gravity) ⇒ Magick::Image #composite_mathematics(image, a, b, c, d, x_off, y_off) ⇒ Magick::Image #composite_mathematics(image, a, b, c, d, gravity, x_off, y_off) ⇒ Magick::Image
Merge the source and destination images according to the formula
a*Sc*Dc + b*Sc + c*Dc + d
where Sc is the source pixel and Dc is the destination pixel.
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# File 'ext/RMagick/rmimage.c', line 3754
VALUE
Image_composite_mathematics(int argc, VALUE *argv, VALUE self)
{
Image *composite_image;
VALUE args[5];
signed long x_off = 0L;
signed long y_off = 0L;
GravityType gravity = NorthWestGravity;
char compose_args[200];
rm_check_destroyed(self);
switch (argc)
{
case 8:
VALUE_TO_ENUM(argv[5], gravity, GravityType);
x_off = NUM2LONG(argv[6]);
y_off = NUM2LONG(argv[7]);
break;
case 7:
x_off = NUM2LONG(argv[5]);
y_off = NUM2LONG(argv[6]);
break;
case 6:
VALUE_TO_ENUM(argv[5], gravity, GravityType);
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (got %d, expected 6 to 8)", argc);
break;
}
composite_image = rm_check_destroyed(rm_cur_image(argv[0]));
snprintf(compose_args, sizeof(compose_args), "%-.16g,%-.16g,%-.16g,%-.16g", NUM2DBL(argv[1]), NUM2DBL(argv[2]), NUM2DBL(argv[3]), NUM2DBL(argv[4]));
SetImageArtifact(composite_image, "compose:args", compose_args);
// Call composite(False, gravity, x_off, y_off, MathematicsCompositeOp, DefaultChannels)
args[0] = argv[0];
args[1] = GravityType_find(gravity);
args[2] = LONG2FIX(x_off);
args[3] = LONG2FIX(y_off);
args[4] = CompositeOperator_find(MathematicsCompositeOp);
return composite(False, 5, args, self, DefaultChannels);
}
|
#composite_tiled(src, composite_op = Magick::OverCompositeOp, channel = Magick::AllChannels) ⇒ Magick::Image #composite_tiled(src, composite_op = Magick::OverCompositeOp, *channels) ⇒ Magick::Image
Composites multiple copies of the source image across and down the image, producing the same results as ImageMagick’s composite command with the -tile option.
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# File 'ext/RMagick/rmimage.c', line 3919
VALUE
Image_composite_tiled(int argc, VALUE *argv, VALUE self)
{
return composite_tiled(False, argc, argv, self);
}
|
#composite_tiled!(src, composite_op = Magick::OverCompositeOp, channel = Magick::AllChannels) ⇒ Magick::Image #composite_tiled!(src, composite_op = Magick::OverCompositeOp, *channels) ⇒ Magick::Image
Composites multiple copies of the source image across and down the image, producing the same results as ImageMagick’s composite command with the -tile option. In-place form of #composite_tiled.
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# File 'ext/RMagick/rmimage.c', line 3946
VALUE
Image_composite_tiled_bang(int argc, VALUE *argv, VALUE self)
{
return composite_tiled(True, argc, argv, self);
}
|
#compress_colormap! ⇒ Magick::Image
Removes duplicate or unused entries in the colormap. Only PseudoClass images have a colormap. If the image is DirectClass then compress_colormap! converts it to PseudoClass.
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# File 'ext/RMagick/rmimage.c', line 3986
VALUE
Image_compress_colormap_bang(VALUE self)
{
Image *image;
MagickBooleanType okay;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_frozen(self);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
okay = CompressImageColormap(image, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
okay = CompressImageColormap(image);
rm_check_image_exception(image, RetainOnError);
#endif
if (!okay)
{
rb_warning("CompressImageColormap failed (probably DirectClass image)");
}
return self;
}
|
#compression ⇒ Magick::CompressionType
Get the compression attribute.
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# File 'ext/RMagick/rmimage.c', line 3958
VALUE
Image_compression(VALUE self)
{
Image *image = rm_check_destroyed(self);
return CompressionType_find(image->compression);
}
|
#compression=(compression) ⇒ Magick::CompressionType
Set the compression attribute.
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# File 'ext/RMagick/rmimage.c', line 3971
VALUE
Image_compression_eq(VALUE self, VALUE compression)
{
Image *image = rm_check_frozen(self);
VALUE_TO_ENUM(compression, image->compression, CompressionType);
return compression;
}
|
#contrast(sharpen = false) ⇒ Magick::Image
Enhance the intensity differences between the lighter and darker elements of the image.
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# File 'ext/RMagick/rmimage.c', line 4194
VALUE
Image_contrast(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
unsigned int sharpen = 0;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
if (argc > 1)
{
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
}
else if (argc == 1)
{
sharpen = RTEST(argv[0]);
}
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
ContrastImage(new_image, sharpen, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
ContrastImage(new_image, sharpen);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#contrast_stretch_channel(black_point, white_point = pixels-black_point, channel = Magick::AllChannels) ⇒ Magick::Image #contrast_stretch_channel(black_point, white_point = pixels-black_point, *channels) ⇒ Magick::Image
This method is a simple image enhancement technique that attempts to improve the contrast in an image by ‘stretching’ the range of intensity values it contains to span a desired range of values. It differs from the more sophisticated histogram equalization in that it can only apply a linear scaling function to the image pixel values.
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# File 'ext/RMagick/rmimage.c', line 4317
VALUE
Image_contrast_stretch_channel(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
ChannelType channels;
double black_point, white_point;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
if (argc > 2)
{
raise_ChannelType_error(argv[argc-1]);
}
get_black_white_point(image, argc, argv, &black_point, &white_point);
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
BEGIN_CHANNEL_MASK(new_image, channels);
ContrastStretchImage(new_image, black_point, white_point, exception);
END_CHANNEL_MASK(new_image);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
ContrastStretchImageChannel(new_image, channels, black_point, white_point);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#convolve(order_arg, kernel_arg) ⇒ Magick::Image
Apply a custom convolution kernel to the image.
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# File 'ext/RMagick/rmimage.c', line 4488
VALUE
Image_convolve(VALUE self, VALUE order_arg, VALUE kernel_arg)
{
Image *image, *new_image;
int order;
ExceptionInfo *exception;
#if defined(IMAGEMAGICK_7)
KernelInfo *kernel;
#else
double *kernel;
unsigned int x;
#endif
image = rm_check_destroyed(self);
order = NUM2INT(order_arg);
if (order <= 0)
{
rb_raise(rb_eArgError, "order must be non-zero and positive");
}
kernel_arg = rb_Array(kernel_arg);
rm_check_ary_len(kernel_arg, (long)(order*order));
#if defined(IMAGEMAGICK_7)
kernel = convolve_create_kernel_info(order, kernel_arg);
#else
// Convert the kernel array argument to an array of doubles
kernel = (double *)ALLOC_N(double, order*order);
for (x = 0; x < (unsigned)(order * order); x++)
{
VALUE element = rb_ary_entry(kernel_arg, (long)x);
if (rm_check_num2dbl(element))
{
kernel[x] = NUM2DBL(element);
}
else
{
xfree((void *)kernel);
rb_raise(rb_eTypeError, "type mismatch: %s given", rb_class2name(CLASS_OF(element)));
}
}
#endif
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
new_image = ConvolveImage(image, kernel, exception);
DestroyKernelInfo(kernel);
#else
new_image = ConvolveImage(image, order, kernel, exception);
xfree((void *)kernel);
#endif
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#convolve_channel(order, kernel, channel = Magick::AllChannels) ⇒ Magick::Image #convolve_channel(order, kernel, *channels) ⇒ Magick::Image
Applies a custom convolution kernel to the specified channel or channels in the image.
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# File 'ext/RMagick/rmimage.c', line 4566
VALUE
Image_convolve_channel(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
VALUE ary;
int order;
ChannelType channels;
ExceptionInfo *exception;
#if defined(IMAGEMAGICK_7)
KernelInfo *kernel;
#else
double *kernel;
unsigned int x;
#endif
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
// There are 2 required arguments.
if (argc > 2)
{
raise_ChannelType_error(argv[argc-1]);
}
if (argc != 2)
{
rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 or more)", argc);
}
order = NUM2INT(argv[0]);
if (order <= 0)
{
rb_raise(rb_eArgError, "order must be non-zero and positive");
}
ary = rb_Array(argv[1]);
rm_check_ary_len(ary, (long)(order*order));
#if defined(IMAGEMAGICK_7)
kernel = convolve_create_kernel_info(order, ary);
#else
kernel = ALLOC_N(double, (long)(order*order));
// Convert the kernel array argument to an array of doubles
for (x = 0; x < (unsigned)(order * order); x++)
{
VALUE element = rb_ary_entry(ary, (long)x);
if (rm_check_num2dbl(element))
{
kernel[x] = NUM2DBL(element);
}
else
{
xfree((void *)kernel);
rb_raise(rb_eTypeError, "type mismatch: %s given", rb_class2name(CLASS_OF(element)));
}
}
#endif
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
BEGIN_CHANNEL_MASK(image, channels);
new_image = ConvolveImage(image, kernel, exception);
CHANGE_RESULT_CHANNEL_MASK(new_image);
END_CHANNEL_MASK(image);
DestroyKernelInfo(kernel);
#else
new_image = ConvolveImageChannel(image, channels, order, kernel, exception);
xfree((void *)kernel);
#endif
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
RB_GC_GUARD(ary);
return rm_image_new(new_image);
}
|
#copy ⇒ Magick::Image
Alias for #dup.
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# File 'ext/RMagick/rmimage.c', line 4653
VALUE
Image_copy(VALUE self)
{
return rb_funcall(self, rm_ID_dup, 0);
}
|
#crop(reset = false, x, y, width, height) ⇒ Magick::Image #crop(reset = false, gravity, width, height) ⇒ Magick::Image #crop(reset = false, gravity, x, y, width, height) ⇒ Magick::Image
Extract a region of the image defined by width, height, x, y.
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# File 'ext/RMagick/rmimage.c', line 4708
VALUE
Image_crop(int argc, VALUE *argv, VALUE self)
{
rm_check_destroyed(self);
return cropper(False, argc, argv, self);
}
|
#crop!(reset = false, x, y, width, height) ⇒ Magick::Image #crop!(reset = false, gravity, width, height) ⇒ Magick::Image #crop!(reset = false, gravity, x, y, width, height) ⇒ Magick::Image
Extract a region of the image defined by width, height, x, y. In-place form of #crop.
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# File 'ext/RMagick/rmimage.c', line 4744
VALUE
Image_crop_bang(int argc, VALUE *argv, VALUE self)
{
rm_check_frozen(self);
return cropper(True, argc, argv, self);
}
|
#cur_image ⇒ Object
Used by ImageList methods - see ImageList#cur_image
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# File 'lib/rmagick_internal.rb', line 866 def cur_image self end |
#cycle_colormap(amount) ⇒ Magick::Image
Displaces the colormap by a given number of positions. If you cycle the colormap a number of times you can produce a psychedelic effect.
The returned image is always a PseudoClass image, regardless of the type of the original image.
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# File 'ext/RMagick/rmimage.c', line 4761
VALUE
Image_cycle_colormap(VALUE self, VALUE amount)
{
Image *image, *new_image;
int amt;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
amt = NUM2INT(amount);
image = rm_check_destroyed(self);
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
CycleColormapImage(new_image, amt, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
CycleColormapImage(new_image, amt);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#decipher(passphrase) ⇒ Magick::Image
Decipher an enciphered image.
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# File 'ext/RMagick/rmimage.c', line 4902
VALUE
Image_decipher(VALUE self, VALUE passphrase)
{
Image *image, *new_image;
char *pf;
ExceptionInfo *exception;
MagickBooleanType okay;
image = rm_check_destroyed(self);
pf = StringValueCStr(passphrase); // ensure passphrase is a string
exception = AcquireExceptionInfo();
new_image = rm_clone_image(image);
okay = DecipherImage(new_image, pf, exception);
rm_check_exception(exception, new_image, DestroyOnError);
if (!okay)
{
DestroyImage(new_image);
rb_raise(rb_eRuntimeError, "DecipherImage failed for unknown reason.");
}
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#define(artifact, value) ⇒ String
Associates makes a copy of the given string arguments and inserts it into the artifact tree.
-
Normally a script should never call this method. Any calls to SetImageArtifact will be part of the methods in which they’re needed, or be called via the OptionalMethodArguments class.
-
If value is nil, the artifact will be removed
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# File 'ext/RMagick/rmimage.c', line 4943
VALUE
Image_define(VALUE self, VALUE artifact, VALUE value)
{
Image *image;
char *key, *val;
MagickBooleanType status;
image = rm_check_frozen(self);
artifact = rb_String(artifact);
key = StringValueCStr(artifact);
if (value == Qnil)
{
DeleteImageArtifact(image, key);
}
else
{
value = rb_String(value);
val = StringValueCStr(value);
status = SetImageArtifact(image, key, val);
if (!status)
{
rb_raise(rb_eNoMemError, "not enough memory to continue");
}
}
return value;
}
|
#delay ⇒ Numeric
Get the Number of ticks which must expire before displaying the next image in an animated sequence. The default number of ticks is 0. By default there are 100 ticks per second but this number can be changed via the ticks_per_second attribute.
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# File 'ext/RMagick/rmimage.c', line 4980
VALUE
Image_delay(VALUE self)
{
IMPLEMENT_ATTR_READER(Image, delay, ulong);
}
|
#delay=(val) ⇒ Numeric
Set the Number of ticks which must expire before displaying the next image in an animated sequence.
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# File 'ext/RMagick/rmimage.c', line 4993
VALUE
Image_delay_eq(VALUE self, VALUE val)
{
IMPLEMENT_ATTR_WRITER(Image, delay, ulong);
}
|
#delete_compose_mask ⇒ Magick::Image
Delete the image composite mask.
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# File 'ext/RMagick/rmimage.c', line 5006
VALUE
Image_delete_compose_mask(VALUE self)
{
Image *image;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_frozen(self);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
SetImageMask(image, CompositePixelMask, NULL, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
SetImageMask(image, NULL);
rm_check_image_exception(image, RetainOnError);
#endif
return self;
}
|
#delete_profile(name) ⇒ Magick::Image
Deletes the specified profile.
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# File 'ext/RMagick/rmimage.c', line 5038
VALUE
Image_delete_profile(VALUE self, VALUE name)
{
Image *image = rm_check_frozen(self);
DeleteImageProfile(image, StringValueCStr(name));
return self;
}
|
#density ⇒ String
Get the vertical and horizontal resolution in pixels of the image. The default is “72x72”.
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# File 'ext/RMagick/rmimage.c', line 4796
VALUE
Image_density(VALUE self)
{
Image *image;
char density[128];
image = rm_check_destroyed(self);
#if defined(IMAGEMAGICK_7)
snprintf(density, sizeof(density), "%gx%g", image->resolution.x, image->resolution.y);
#else
snprintf(density, sizeof(density), "%gx%g", image->x_resolution, image->y_resolution);
#endif
return rb_str_new2(density);
}
|
#density=(density_arg) ⇒ String, Magick::Geometry
Set the vertical and horizontal resolution in pixels of the image.
-
The density is a string of the form “XresxYres” or simply “Xres”.
-
If the y resolution is not specified, set it equal to the x resolution.
-
This is equivalent to PerlMagick’s handling of density.
-
The density can also be a Geometry object. The width attribute is used for the x resolution. The height attribute is used for the y resolution. If the height attribute is missing, the width attribute is used for both.
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# File 'ext/RMagick/rmimage.c', line 4827
VALUE
Image_density_eq(VALUE self, VALUE density_arg)
{
Image *image;
char *density;
VALUE x_val, y_val;
int count;
double x_res, y_res;
image = rm_check_frozen(self);
// Get the Class ID for the Geometry class.
if (!Class_Geometry)
{
Class_Geometry = rb_const_get(Module_Magick, rm_ID_Geometry);
}
// Geometry object. Width and height attributes are always positive.
if (CLASS_OF(density_arg) == Class_Geometry)
{
x_val = rb_funcall(density_arg, rm_ID_width, 0);
x_res = NUM2DBL(x_val);
y_val = rb_funcall(density_arg, rm_ID_height, 0);
y_res = NUM2DBL(y_val);
if (x_res == 0.0)
{
rb_raise(rb_eArgError, "invalid x resolution: %f", x_res);
}
#if defined(IMAGEMAGICK_7)
image->resolution.y = y_res != 0.0 ? y_res : x_res;
image->resolution.x = x_res;
#else
image->y_resolution = y_res != 0.0 ? y_res : x_res;
image->x_resolution = x_res;
#endif
}
// Convert the argument to a string
else
{
density = StringValueCStr(density_arg);
if (!IsGeometry(density))
{
rb_raise(rb_eArgError, "invalid density geometry %s", density);
}
#if defined(IMAGEMAGICK_7)
count = sscanf(density, "%lfx%lf", &image->resolution.x, &image->resolution.y);
#else
count = sscanf(density, "%lfx%lf", &image->x_resolution, &image->y_resolution);
#endif
if (count < 2)
{
#if defined(IMAGEMAGICK_7)
image->resolution.y = image->resolution.x;
#else
image->y_resolution = image->x_resolution;
#endif
}
}
RB_GC_GUARD(x_val);
RB_GC_GUARD(y_val);
return density_arg;
}
|
#depth ⇒ Numeric
Return the image depth (8, 16 or 32).
-
If all pixels have lower-order bytes equal to higher-order bytes, the depth will be reported as 8 even if the depth field in the Image structure says 16.
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# File 'ext/RMagick/rmimage.c', line 5056
VALUE
Image_depth(VALUE self)
{
Image *image;
unsigned long depth = 0;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
exception = AcquireExceptionInfo();
depth = GetImageDepth(image, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
return INT2FIX(depth);
}
|
#deskew(threshold = 0.40, auto_crop_width = nil) ⇒ Magick::Image
Straightens an image. A threshold of 40% works for most images.
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# File 'ext/RMagick/rmimage.c', line 5085
VALUE
Image_deskew(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
double threshold = 40.0 * QuantumRange / 100.0;
unsigned long width;
char auto_crop_width[20];
ExceptionInfo *exception;
image = rm_check_destroyed(self);
switch (argc)
{
case 2:
width = NUM2ULONG(argv[1]);
memset(auto_crop_width, 0, sizeof(auto_crop_width));
snprintf(auto_crop_width, sizeof(auto_crop_width), "%lu", width);
SetImageArtifact(image, "deskew:auto-crop", auto_crop_width);
case 1:
threshold = rm_percentage(argv[0], 1.0) * QuantumRange;
case 0:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 or 2)", argc);
break;
}
exception = AcquireExceptionInfo();
new_image = DeskewImage(image, threshold, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#despeckle ⇒ Magick::Image
Reduce the speckle noise in an image while preserving the edges of the original image.
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# File 'ext/RMagick/rmimage.c', line 5126
VALUE
Image_despeckle(VALUE self)
{
Image *image, *new_image;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
exception = AcquireExceptionInfo();
new_image = DespeckleImage(image, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#destroy! ⇒ Magick::Image
Free all the memory associated with an image.
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# File 'ext/RMagick/rmimage.c', line 5148
VALUE
Image_destroy_bang(VALUE self)
{
Image *image;
rb_check_frozen(self);
Data_Get_Struct(self, Image, image);
rm_image_destroy(image);
DATA_PTR(self) = NULL;
return self;
}
|
#destroyed? ⇒ Boolean
Return true if the image has been destroyed, false otherwise.
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# File 'ext/RMagick/rmimage.c', line 5166
VALUE
Image_destroyed_q(VALUE self)
{
Image *image;
Data_Get_Struct(self, Image, image);
return image ? Qfalse : Qtrue;
}
|
#difference(other) ⇒ Array<Float>
Compares two images and computes statistics about their difference.
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# File 'ext/RMagick/rmimage.c', line 5193
VALUE
Image_difference(VALUE self, VALUE other)
{
Image *image;
Image *image2;
VALUE mean, nmean, nmax;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
other = rm_cur_image(other);
image2 = rm_check_destroyed(other);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
IsImagesEqual(image, image2, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
IsImagesEqual(image, image2);
rm_check_image_exception(image, RetainOnError);
#endif
mean = rb_float_new(image->error.mean_error_per_pixel);
nmean = rb_float_new(image->error.normalized_mean_error);
nmax = rb_float_new(image->error.normalized_maximum_error);
RB_GC_GUARD(mean);
RB_GC_GUARD(nmean);
RB_GC_GUARD(nmax);
return rb_ary_new3(3, mean, nmean, nmax);
}
|
#directory ⇒ String
Get image directory.
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# File 'ext/RMagick/rmimage.c', line 5234
VALUE
Image_directory(VALUE self)
{
IMPLEMENT_ATTR_READER(Image, directory, str);
}
|
#dispatch(x, y, columns, rows, map, float = false) ⇒ Array<Numeric>
Extract pixel data from the image and returns it as an array of pixels. The “x”, “y”, “width” and “height” parameters specify the rectangle to be extracted. The “map” parameter reflects the expected ordering of the pixel array. It can be any combination or order of R = red, G = green, B = blue, A = alpha, C = cyan, Y = yellow, M = magenta, K = black, or I = intensity (for grayscale). If the “float” parameter is specified and true, the pixel data is returned as floating-point numbers in the range [0..1]. By default the pixel data is returned as integers in the range [0..QuantumRange].
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# File 'ext/RMagick/rmimage.c', line 5318
VALUE
Image_dispatch(int argc, VALUE *argv, VALUE self)
{
Image *image;
long x, y;
unsigned long columns, rows, n, npixels;
VALUE pixels_ary;
StorageType stg_type = QuantumPixel;
char *map;
long mapL;
MagickBooleanType okay;
ExceptionInfo *exception;
volatile union
{
Quantum *i;
double *f;
void *v;
} pixels;
rm_check_destroyed(self);
if (argc < 5 || argc > 6)
{
rb_raise(rb_eArgError, "wrong number of arguments (%d for 5 or 6)", argc);
}
x = NUM2LONG(argv[0]);
y = NUM2LONG(argv[1]);
columns = NUM2ULONG(argv[2]);
rows = NUM2ULONG(argv[3]);
map = rm_str2cstr(argv[4], &mapL);
if (argc == 6)
{
stg_type = RTEST(argv[5]) ? DoublePixel : QuantumPixel;
}
// Compute the size of the pixel array and allocate the memory.
npixels = columns * rows * mapL;
pixels.v = stg_type == QuantumPixel ? (void *) ALLOC_N(Quantum, npixels)
: (void *) ALLOC_N(double, npixels);
// Create the Ruby array for the pixels. Return this even if ExportImagePixels fails.
pixels_ary = rb_ary_new();
Data_Get_Struct(self, Image, image);
exception = AcquireExceptionInfo();
okay = ExportImagePixels(image, x, y, columns, rows, map, stg_type, (void *)pixels.v, exception);
if (!okay)
{
goto exit;
}
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
// Convert the pixel data to the appropriate Ruby type
if (stg_type == QuantumPixel)
{
for (n = 0; n < npixels; n++)
{
rb_ary_push(pixels_ary, QUANTUM2NUM(pixels.i[n]));
}
}
else
{
for (n = 0; n < npixels; n++)
{
rb_ary_push(pixels_ary, rb_float_new(pixels.f[n]));
}
}
exit:
xfree((void *)pixels.v);
RB_GC_GUARD(pixels_ary);
return pixels_ary;
}
|
#displace(displacement_map, x_amp, y_amp = x_amp, gravity = Magick::NorthWestGravity, x_offset = 0, y_offset = 0) ⇒ Magick::Image
Uses displacement_map to move color from img to the output image. This method corresponds to the -displace option of ImageMagick’s composite command.
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# File 'ext/RMagick/rmimage.c', line 5256
VALUE
Image_displace(int argc, VALUE *argv, VALUE self)
{
Image *image, *displacement_map;
VALUE dmap;
double x_amplitude = 0.0, y_amplitude = 0.0;
long x_offset = 0L, y_offset = 0L;
image = rm_check_destroyed(self);
if (argc < 2)
{
rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 to 6)", argc);
}
dmap = rm_cur_image(argv[0]);
displacement_map = rm_check_destroyed(dmap);
if (argc > 3)
{
get_composite_offsets(argc-3, &argv[3], image, displacement_map, &x_offset, &y_offset);
// There must be 3 arguments left
argc = 3;
}
switch (argc)
{
case 3:
y_amplitude = NUM2DBL(argv[2]);
x_amplitude = NUM2DBL(argv[1]);
break;
case 2:
x_amplitude = NUM2DBL(argv[1]);
y_amplitude = x_amplitude;
break;
}
RB_GC_GUARD(dmap);
return special_composite(image, displacement_map, x_amplitude, y_amplitude,
x_offset, y_offset, DisplaceCompositeOp);
}
|
#display ⇒ Magick::Image Also known as: __display__
Display the image to an X window screen.
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# File 'ext/RMagick/rmimage.c', line 5406
VALUE
Image_display(VALUE self)
{
Image *image;
Info *info;
VALUE info_obj;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
if (image->rows == 0 || image->columns == 0)
{
rb_raise(rb_eArgError, "invalid image geometry (%"RMIuSIZE"x%"RMIuSIZE")", image->rows, image->columns);
}
info_obj = rm_info_new();
Data_Get_Struct(info_obj, Info, info);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
DisplayImages(info, image, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
DisplayImages(info, image);
rm_check_image_exception(image, RetainOnError);
#endif
RB_GC_GUARD(info_obj);
return self;
}
|
#dispose ⇒ Magick::DisposeType
Return the dispose attribute as a DisposeType enum.
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# File 'ext/RMagick/rmimage.c', line 5447
VALUE
Image_dispose(VALUE self)
{
Image *image = rm_check_destroyed(self);
return DisposeType_find(image->dispose);
}
|
#dispose=(dispose) ⇒ Magick::DisposeType
Set the dispose attribute.
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# File 'ext/RMagick/rmimage.c', line 5461
VALUE
Image_dispose_eq(VALUE self, VALUE dispose)
{
Image *image = rm_check_frozen(self);
VALUE_TO_ENUM(dispose, image->dispose, DisposeType);
return dispose;
}
|
#dissolve(overlay, src_percent, dst_percent = -1.0, gravity = Magick::NorthWestGravity, x_offset = 0, y_offset = 0) ⇒ Magick::Image
Composites the overlay image into the target image. The opacity of img is multiplied by dst_percentage and opacity of overlay is multiplied by src_percentage.
This method corresponds to the -dissolve option of ImageMagick’s composite command.
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# File 'ext/RMagick/rmimage.c', line 5493
VALUE
Image_dissolve(int argc, VALUE *argv, VALUE self)
{
Image *image, *overlay;
double src_percent, dst_percent = -1.0;
long x_offset = 0L, y_offset = 0L;
VALUE composite_image, ovly;
image = rm_check_destroyed(self);
if (argc < 1)
{
rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 to 6)", argc);
}
ovly = rm_cur_image(argv[0]);
overlay = rm_check_destroyed(ovly);
if (argc > 3)
{
get_composite_offsets(argc-3, &argv[3], image, overlay, &x_offset, &y_offset);
// There must be 3 arguments left
argc = 3;
}
switch (argc)
{
case 3:
dst_percent = rm_percentage(argv[2], 1.0) * 100.0;
case 2:
src_percent = rm_percentage(argv[1], 1.0) * 100.0;
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 to 6)", argc);
break;
}
composite_image = special_composite(image, overlay, src_percent, dst_percent,
x_offset, y_offset, DissolveCompositeOp);
RB_GC_GUARD(composite_image);
RB_GC_GUARD(ovly);
return composite_image;
}
|
#distort(type, points, bestfit = false) ⇒ Magick::Image #distort(type, points, bestfit = false) { ... } ⇒ Magick::Image
Distort an image using the specified distortion type and its required arguments. This method is equivalent to ImageMagick’s -distort option.
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# File 'ext/RMagick/rmimage.c', line 5582
VALUE
Image_distort(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
VALUE pts;
unsigned long n, npoints;
DistortMethod distortion_method;
double *points;
MagickBooleanType bestfit = MagickFalse;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
rm_get_optional_arguments(self);
switch (argc)
{
case 3:
bestfit = RTEST(argv[2]);
case 2:
// Ensure pts is an array
pts = rb_Array(argv[1]);
VALUE_TO_ENUM(argv[0], distortion_method, DistortMethod);
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (expected 2 or 3, got %d)", argc);
break;
}
npoints = RARRAY_LEN(pts);
points = ALLOC_N(double, npoints);
for (n = 0; n < npoints; n++)
{
VALUE element = rb_ary_entry(pts, n);
if (rm_check_num2dbl(element))
{
points[n] = NUM2DBL(element);
}
else
{
xfree(points);
rb_raise(rb_eTypeError, "type mismatch: %s given", rb_class2name(CLASS_OF(element)));
}
}
exception = AcquireExceptionInfo();
new_image = DistortImage(image, distortion_method, npoints, points, bestfit, exception);
xfree(points);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
RB_GC_GUARD(pts);
return rm_image_new(new_image);
}
|
#distortion_channel(reconstructed_image, metric, channel = Magick::AllChannels) ⇒ Float #distortion_channel(reconstructed_image, metric, *channels) ⇒ Float
Compares one or more image channels of an image to a reconstructed image and returns the specified distortion metric.
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# File 'ext/RMagick/rmimage.c', line 5657
VALUE
Image_distortion_channel(int argc, VALUE *argv, VALUE self)
{
Image *image, *reconstruct;
ChannelType channels;
ExceptionInfo *exception;
MetricType metric;
VALUE rec;
double distortion;
#if defined(IMAGEMAGICK_7)
Image *difference_image;
#endif
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
if (argc > 2)
{
raise_ChannelType_error(argv[argc-1]);
}
if (argc < 2)
{
rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 or more)", argc);
}
rec = rm_cur_image(argv[0]);
reconstruct = rm_check_destroyed(rec);
VALUE_TO_ENUM(argv[1], metric, MetricType);
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
BEGIN_CHANNEL_MASK(image, channels);
difference_image = CompareImages(image, reconstruct, metric, &distortion, exception);
END_CHANNEL_MASK(image);
DestroyImage(difference_image);
#else
GetImageChannelDistortion(image, reconstruct, channels, metric, &distortion, exception);
#endif
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
RB_GC_GUARD(rec);
return rb_float_new(distortion);
}
|
#dup ⇒ Magick::Image
Duplicates a image.
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# File 'ext/RMagick/rmimage.c', line 5771
VALUE
Image_dup(VALUE self)
{
VALUE dup;
rm_check_destroyed(self);
dup = Data_Wrap_Struct(CLASS_OF(self), NULL, rm_image_destroy, NULL);
RB_GC_GUARD(dup);
return rb_funcall(dup, rm_ID_initialize_copy, 1, self);
}
|
#each_iptc_dataset ⇒ Object
Iterate over IPTC record number:dataset tags, yield for each non-nil dataset
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# File 'lib/rmagick_internal.rb', line 926 def each_iptc_dataset Magick::IPTC.constants.each do |record| rec = Magick::IPTC.const_get(record) rec.constants.each do |dataset| data_field = get_iptc_dataset(rec.const_get(dataset)) yield(dataset, data_field) unless data_field.nil? end end nil end |
#each_pixel ⇒ Object
Thanks to Russell Norris!
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# File 'lib/rmagick_internal.rb', line 871 def each_pixel get_pixels(0, 0, columns, rows).each_with_index do |p, n| yield(p, n % columns, n / columns) end self end |
#each_profile {|name, val| ... } ⇒ Object
Calls block once for each profile in the image, passing the profile name and value as parameters.
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# File 'ext/RMagick/rmimage.c', line 5792
VALUE
Image_each_profile(VALUE self)
{
Image *image;
VALUE ary;
VALUE val = Qnil;
char *name;
const StringInfo *profile;
image = rm_check_destroyed(self);
ResetImageProfileIterator(image);
ary = rb_ary_new2(2);
name = GetNextImageProfile(image);
while (name)
{
rb_ary_store(ary, 0, rb_str_new2(name));
profile = GetImageProfile(image, name);
if (!profile)
{
rb_ary_store(ary, 1, Qnil);
}
else
{
rb_ary_store(ary, 1, rb_str_new((char *)profile->datum, (long)profile->length));
}
val = rb_yield(ary);
name = GetNextImageProfile(image);
}
RB_GC_GUARD(ary);
RB_GC_GUARD(val);
return val;
}
|
#edge(radius = 0.0) ⇒ Magick::Image
Find edges in an image. “radius” defines the radius of the convolution filter.
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# File 'ext/RMagick/rmimage.c', line 5838
VALUE
Image_edge(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
double radius = 0.0;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
switch (argc)
{
case 1:
radius = NUM2DBL(argv[0]);
case 0:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
break;
}
exception = AcquireExceptionInfo();
new_image = EdgeImage(image, radius, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#emboss(radius = 0.0, sigma = 1.0) ⇒ Magick::Image
Adds a 3-dimensional effect.
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# File 'ext/RMagick/rmimage.c', line 5922
VALUE
Image_emboss(int argc, VALUE *argv, VALUE self)
{
return effect_image(self, argc, argv, EmbossImage);
}
|
#encipher(passphrase) ⇒ Magick::Image
Encipher an image.
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# File 'ext/RMagick/rmimage.c', line 5937
VALUE
Image_encipher(VALUE self, VALUE passphrase)
{
Image *image, *new_image;
char *pf;
ExceptionInfo *exception;
MagickBooleanType okay;
image = rm_check_destroyed(self);
pf = StringValueCStr(passphrase); // ensure passphrase is a string
exception = AcquireExceptionInfo();
new_image = rm_clone_image(image);
okay = EncipherImage(new_image, pf, exception);
rm_check_exception(exception, new_image, DestroyOnError);
if (!okay)
{
DestroyImage(new_image);
rb_raise(rb_eRuntimeError, "EncipherImage failed for unknown reason.");
}
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#endian ⇒ Magick::EndianType
Return endian option for images that support it.
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# File 'ext/RMagick/rmimage.c', line 5971
VALUE
Image_endian(VALUE self)
{
Image *image = rm_check_destroyed(self);
return EndianType_find(image->endian);
}
|
#endian=(type) ⇒ Magick::EndianType
Set endian option for images that support it.
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# File 'ext/RMagick/rmimage.c', line 5985
VALUE
Image_endian_eq(VALUE self, VALUE type)
{
Image *image = rm_check_frozen(self);
VALUE_TO_ENUM(type, image->endian, EndianType);
return type;
}
|
#enhance ⇒ Magick::Image
Apply a digital filter that improves the quality of a noisy image.
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# File 'ext/RMagick/rmimage.c', line 5998
VALUE
Image_enhance(VALUE self)
{
Image *image, *new_image;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
exception = AcquireExceptionInfo();
new_image = EnhanceImage(image, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#equalize ⇒ Magick::Image
Apply a histogram equalization to the image.
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# File 'ext/RMagick/rmimage.c', line 6020
VALUE
Image_equalize(VALUE self)
{
Image *image, *new_image;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
EqualizeImage(new_image, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
EqualizeImage(new_image);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#equalize_channel(channel = Magick::AllChannels) ⇒ Magick::Image #equalize_channel(*channels) ⇒ Magick::Image
Applies a histogram equalization to the image. Only the specified channels are equalized.
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# File 'ext/RMagick/rmimage.c', line 6056
VALUE
Image_equalize_channel(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
ChannelType channels;
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
if (argc > 0)
{
raise_ChannelType_error(argv[argc-1]);
}
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
BEGIN_CHANNEL_MASK(new_image, channels);
EqualizeImage(new_image, exception);
END_CHANNEL_MASK(new_image);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
EqualizeImageChannel(new_image, channels);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#erase! ⇒ Magick::Image
Reset the image to the background color.
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# File 'ext/RMagick/rmimage.c', line 6096
VALUE
Image_erase_bang(VALUE self)
{
Image *image;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_frozen(self);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
SetImageBackgroundColor(image, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
SetImageBackgroundColor(image);
rm_check_image_exception(image, RetainOnError);
#endif
return self;
}
|
#excerpt(x, y, width, height) ⇒ Magick::Image
This method is very similar to crop. It extracts the rectangle specified by its arguments from the image and returns it as a new image. However, excerpt does not respect the virtual page offset and does not update the page offset and is more efficient than cropping.
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# File 'ext/RMagick/rmimage.c', line 6188
VALUE
Image_excerpt(VALUE self, VALUE x, VALUE y, VALUE width, VALUE height)
{
rm_check_destroyed(self);
return excerpt(False, self, x, y, width, height);
}
|
#excerpt!(x, y, width, height) ⇒ Magick::Image
In-place form of #excerpt.
This method is very similar to crop. It extracts the rectangle specified by its arguments from the image and returns it as a new image. However, excerpt does not respect the virtual page offset and does not update the page offset and is more efficient than cropping.
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# File 'ext/RMagick/rmimage.c', line 6213
VALUE
Image_excerpt_bang(VALUE self, VALUE x, VALUE y, VALUE width, VALUE height)
{
rm_check_frozen(self);
return excerpt(True, self, x, y, width, height);
}
|
#export_pixels(x = 0, y = 0, cols = self.columns, rows = self.rows, map = "RGB") ⇒ Array<Numeric>
Extracts the pixel data from the specified rectangle and returns it as an array of Integer values. The array returned by #export_pixels is suitable for use as an argument to #import_pixels.
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# File 'ext/RMagick/rmimage.c', line 6238
VALUE
Image_export_pixels(int argc, VALUE *argv, VALUE self)
{
Image *image;
long x_off = 0L, y_off = 0L;
unsigned long cols, rows;
long n, npixels;
unsigned int okay;
const char *map = "RGB";
Quantum *pixels;
VALUE ary;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
cols = image->columns;
rows = image->rows;
switch (argc)
{
case 5:
map = StringValueCStr(argv[4]);
case 4:
rows = NUM2ULONG(argv[3]);
case 3:
cols = NUM2ULONG(argv[2]);
case 2:
y_off = NUM2LONG(argv[1]);
case 1:
x_off = NUM2LONG(argv[0]);
case 0:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 5)", argc);
break;
}
if ( x_off < 0 || (unsigned long)x_off > image->columns
|| y_off < 0 || (unsigned long)y_off > image->rows
|| cols == 0 || rows == 0)
{
rb_raise(rb_eArgError, "invalid extract geometry");
}
npixels = (long)(cols * rows * strlen(map));
pixels = ALLOC_N(Quantum, npixels);
if (!pixels) // app recovered from exception
{
return rb_ary_new2(0L);
}
exception = AcquireExceptionInfo();
okay = ExportImagePixels(image, x_off, y_off, cols, rows, map, QuantumPixel, (void *)pixels, exception);
if (!okay)
{
xfree((void *)pixels);
CHECK_EXCEPTION();
// Should never get here...
rm_magick_error("ExportImagePixels failed with no explanation.");
}
DestroyExceptionInfo(exception);
ary = rb_ary_new2(npixels);
for (n = 0; n < npixels; n++)
{
rb_ary_push(ary, QUANTUM2NUM(pixels[n]));
}
xfree((void *)pixels);
RB_GC_GUARD(ary);
return ary;
}
|
#export_pixels_to_str(x = 0, y = 0, cols = self.columns, rows = self.rows, map = "RGB", type = Magick::CharPixel) ⇒ String
Extracts the pixel data from the specified rectangle and returns it as a string.
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# File 'ext/RMagick/rmimage.c', line 6401
VALUE
Image_export_pixels_to_str(int argc, VALUE *argv, VALUE self)
{
Image *image;
long x_off = 0L, y_off = 0L;
unsigned long cols, rows;
unsigned long npixels;
size_t sz;
unsigned int okay;
const char *map = "RGB";
StorageType type = CharPixel;
VALUE string;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
cols = image->columns;
rows = image->rows;
switch (argc)
{
case 6:
VALUE_TO_ENUM(argv[5], type, StorageType);
case 5:
map = StringValueCStr(argv[4]);
case 4:
rows = NUM2ULONG(argv[3]);
case 3:
cols = NUM2ULONG(argv[2]);
case 2:
y_off = NUM2LONG(argv[1]);
case 1:
x_off = NUM2LONG(argv[0]);
case 0:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 to 6)", argc);
break;
}
if ( x_off < 0 || (unsigned long)x_off > image->columns
|| y_off < 0 || (unsigned long)y_off > image->rows
|| cols == 0 || rows == 0)
{
rb_raise(rb_eArgError, "invalid extract geometry");
}
npixels = cols * rows * strlen(map);
switch (type)
{
case CharPixel:
sz = sizeof(unsigned char);
break;
case ShortPixel:
sz = sizeof(unsigned short);
break;
case DoublePixel:
sz = sizeof(double);
break;
case FloatPixel:
sz = sizeof(float);
break;
case LongPixel:
sz = sizeof(unsigned long);
break;
case QuantumPixel:
sz = sizeof(Quantum);
break;
case UndefinedPixel:
default:
rb_raise(rb_eArgError, "undefined storage type");
break;
}
// Allocate a string long enough to hold the exported pixel data.
// Get a pointer to the buffer.
string = rb_str_new2("");
rb_str_resize(string, (long)(sz * npixels));
exception = AcquireExceptionInfo();
okay = ExportImagePixels(image, x_off, y_off, cols, rows, map, type, (void *)RSTRING_PTR(string), exception);
if (!okay)
{
// Let GC have the string buffer.
rb_str_resize(string, 0);
CHECK_EXCEPTION();
// Should never get here...
rm_magick_error("ExportImagePixels failed with no explanation.");
}
DestroyExceptionInfo(exception);
RB_GC_GUARD(string);
return string;
}
|
#extent(width, height, x = 0, y = 0) ⇒ Magick::Image
If width or height is greater than the target image’s width or height, extends the width and height of the target image to the specified values. The new pixels are set to the background color. If width or height is less than the target image’s width or height, crops the target image.
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# File 'ext/RMagick/rmimage.c', line 6331
VALUE
Image_extent(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
RectangleInfo geometry;
long height, width;
ExceptionInfo *exception;
rm_check_destroyed(self);
if (argc < 2 || argc > 4)
{
rb_raise(rb_eArgError, "wrong number of arguments (expected 2 to 4, got %d)", argc);
}
geometry.y = geometry.x = 0L;
switch (argc)
{
case 4:
geometry.y = NUM2LONG(argv[3]);
case 3:
geometry.x = NUM2LONG(argv[2]);
default:
geometry.height = height = NUM2LONG(argv[1]);
geometry.width = width = NUM2LONG(argv[0]);
break;
}
// Use the signed versions of these two values to test for < 0
if (height <= 0L || width <= 0L)
{
if (geometry.x == 0 && geometry.y == 0)
{
rb_raise(rb_eArgError, "invalid extent geometry %ldx%ld", width, height);
}
else
{
rb_raise(rb_eArgError, "invalid extent geometry %ldx%ld+%"RMIdSIZE"+%"RMIdSIZE"",
width, height, geometry.x, geometry.y);
}
}
Data_Get_Struct(self, Image, image);
exception = AcquireExceptionInfo();
new_image = ExtentImage(image, &geometry, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#extract_info ⇒ Magick::Rectangle
The extract_info attribute reader.
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# File 'ext/RMagick/rmimage.c', line 6506
VALUE
Image_extract_info(VALUE self)
{
Image *image = rm_check_destroyed(self);
return Import_RectangleInfo(&image->extract_info);
}
|
#extract_info=(rect) ⇒ Magick::Rectangle
Set the extract_info attribute.
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# File 'ext/RMagick/rmimage.c', line 6520
VALUE
Image_extract_info_eq(VALUE self, VALUE rect)
{
Image *image = rm_check_frozen(self);
Export_RectangleInfo(&image->extract_info, rect);
return rect;
}
|
#filename ⇒ String
Get image filename.
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# File 'ext/RMagick/rmimage.c', line 6534
VALUE
Image_filename(VALUE self)
{
IMPLEMENT_ATTR_READER(Image, filename, str);
}
|
#filesize ⇒ Numeric
Return the image file size.
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# File 'ext/RMagick/rmimage.c', line 6546
VALUE Image_filesize(VALUE self)
{
Image *image = rm_check_destroyed(self);
return INT2FIX(GetBlobSize(image));
}
|
#filter ⇒ Magick::FilterType
Get filter type.
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# File 'ext/RMagick/rmimage.c', line 6558
VALUE
Image_filter(VALUE self)
{
Image *image = rm_check_destroyed(self);
return FilterType_find(image->filter);
}
|
#filter=(filter) ⇒ Magick::FilterType
Set filter type.
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# File 'ext/RMagick/rmimage.c', line 6572
VALUE
Image_filter_eq(VALUE self, VALUE filter)
{
Image *image = rm_check_frozen(self);
VALUE_TO_ENUM(filter, image->filter, FilterType);
return filter;
}
|
#find_similar_region(target, x = 0, y = 0) ⇒ Array<Numeric>?
This interesting method searches for a rectangle in the image that is similar to the target. For the rectangle to be similar each pixel in the rectangle must match the corresponding pixel in the target image within the range specified by the fuzz attributes of the image and the target image.
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# File 'ext/RMagick/rmimage.c', line 6597
VALUE
Image_find_similar_region(int argc, VALUE *argv, VALUE self)
{
Image *image, *target;
VALUE region, targ;
ssize_t x = 0L, y = 0L;
ExceptionInfo *exception;
unsigned int okay;
image = rm_check_destroyed(self);
switch (argc)
{
case 3:
y = NUM2LONG(argv[2]);
case 2:
x = NUM2LONG(argv[1]);
case 1:
targ = rm_cur_image(argv[0]);
target = rm_check_destroyed(targ);
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 to 3)", argc);
break;
}
exception = AcquireExceptionInfo();
okay = IsEquivalentImage(image, target, &x, &y, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
if (!okay)
{
return Qnil;
}
region = rb_ary_new2(2);
rb_ary_store(region, 0L, LONG2NUM(x));
rb_ary_store(region, 1L, LONG2NUM(y));
RB_GC_GUARD(region);
RB_GC_GUARD(targ);
return region;
}
|
#flip ⇒ Magick::Image
Create a vertical mirror image by reflecting the pixels around the central x-axis.
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# File 'ext/RMagick/rmimage.c', line 6691
VALUE
Image_flip(VALUE self)
{
rm_check_destroyed(self);
return flipflop(False, self, FlipImage);
}
|
#flip! ⇒ Magick::Image
Create a vertical mirror image by reflecting the pixels around the central x-axis. In-place form of #flip.
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# File 'ext/RMagick/rmimage.c', line 6708
VALUE
Image_flip_bang(VALUE self)
{
rm_check_frozen(self);
return flipflop(True, self, FlipImage);
}
|
#flop ⇒ Magick::Image
Create a horizonal mirror image by reflecting the pixels around the central y-axis.
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# File 'ext/RMagick/rmimage.c', line 6724
VALUE
Image_flop(VALUE self)
{
rm_check_destroyed(self);
return flipflop(False, self, FlopImage);
}
|
#flop! ⇒ Magick::Image
Create a horizonal mirror image by reflecting the pixels around the central y-axis. In-place form of #flop.
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# File 'ext/RMagick/rmimage.c', line 6741
VALUE
Image_flop_bang(VALUE self)
{
rm_check_frozen(self);
return flipflop(True, self, FlopImage);
}
|
#format ⇒ String?
Return the image encoding format. For example, “GIF” or “PNG”.
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# File 'ext/RMagick/rmimage.c', line 6754
VALUE
Image_format(VALUE self)
{
Image *image;
const MagickInfo *magick_info;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
if (*image->magick)
{
// Deliberately ignore the exception info!
exception = AcquireExceptionInfo();
magick_info = GetMagickInfo(image->magick, exception);
DestroyExceptionInfo(exception);
return magick_info ? rb_str_new2(magick_info->name) : Qnil;
}
return Qnil;
}
|
#format=(magick) ⇒ String
Set the image encoding format. For example, “GIF” or “PNG”.
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# File 'ext/RMagick/rmimage.c', line 6782
VALUE
Image_format_eq(VALUE self, VALUE magick)
{
Image *image;
const MagickInfo *m;
char *mgk;
ExceptionInfo *exception;
image = rm_check_frozen(self);
mgk = StringValueCStr(magick);
exception = AcquireExceptionInfo();
m = GetMagickInfo(mgk, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
if (!m)
{
rb_raise(rb_eArgError, "unknown format: %s", mgk);
}
strlcpy(image->magick, m->name, sizeof(image->magick));
return magick;
}
|
#frame(width = self.columns+25*2, height = self.rows+25*2, x = 25, y = 25, inner_bevel = 6, outer_bevel = 6, color = self.matte_color) ⇒ Magick::Image
Add a simulated three-dimensional border around the image.
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# File 'ext/RMagick/rmimage.c', line 6824
VALUE
Image_frame(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
ExceptionInfo *exception;
FrameInfo frame_info;
image = rm_check_destroyed(self);
frame_info.width = image->columns + 50;
frame_info.height = image->rows + 50;
frame_info.x = 25;
frame_info.y = 25;
frame_info.inner_bevel = 6;
frame_info.outer_bevel = 6;
switch (argc)
{
case 7:
Color_to_PixelColor(&image->matte_color, argv[6]);
case 6:
frame_info.outer_bevel = NUM2LONG(argv[5]);
case 5:
frame_info.inner_bevel = NUM2LONG(argv[4]);
case 4:
frame_info.y = NUM2LONG(argv[3]);
case 3:
frame_info.x = NUM2LONG(argv[2]);
case 2:
frame_info.height = image->rows + 2*NUM2LONG(argv[1]);
case 1:
frame_info.width = image->columns + 2*NUM2LONG(argv[0]);
case 0:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 7)", argc);
break;
}
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
new_image = FrameImage(image, &frame_info, image->compose, exception);
#else
new_image = FrameImage(image, &frame_info, exception);
#endif
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#function_channel(function, *args, channel = Magick::AllChannels) ⇒ Magick::Image #function_channel(function, *args, *channels) ⇒ Magick::Image
Set the function on a channel.
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# File 'ext/RMagick/rmimage.c', line 6942
VALUE
Image_function_channel(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
MagickFunction function;
unsigned long n, nparms;
double *parms;
ChannelType channels;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
// The number of parameters depends on the function.
if (argc == 0)
{
rb_raise(rb_eArgError, "no function specified");
}
VALUE_TO_ENUM(argv[0], function, MagickFunction);
argc -= 1;
argv += 1;
switch (function)
{
case PolynomialFunction:
if (argc == 0)
{
rb_raise(rb_eArgError, "PolynomialFunction requires at least one argument.");
}
break;
case SinusoidFunction:
case ArcsinFunction:
case ArctanFunction:
if (argc < 1 || argc > 4)
{
rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 to 4)", argc);
}
break;
default:
rb_raise(rb_eArgError, "undefined function");
break;
}
nparms = argc;
parms = ALLOC_N(double, nparms);
for (n = 0; n < nparms; n++)
{
VALUE element = argv[n];
if (rm_check_num2dbl(element))
{
parms[n] = NUM2DBL(element);
}
else
{
xfree(parms);
rb_raise(rb_eTypeError, "type mismatch: %s given", rb_class2name(CLASS_OF(element)));
}
}
exception = AcquireExceptionInfo();
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
BEGIN_CHANNEL_MASK(new_image, channels);
FunctionImage(new_image, function, nparms, parms, exception);
END_CHANNEL_MASK(new_image);
#else
FunctionImageChannel(new_image, channels, function, nparms, parms, exception);
#endif
xfree(parms);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#fuzz ⇒ Float
Get the number of algorithms search for a target color. By default the color must be exact. Use this attribute to match colors that are close to the target color in RGB space.
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# File 'ext/RMagick/rmimage.c', line 7028
VALUE
Image_fuzz(VALUE self)
{
IMPLEMENT_ATTR_READER(Image, fuzz, dbl);
}
|
#fuzz=(fuzz) ⇒ String, Float
Set the number of algorithms search for a target color.
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# File 'ext/RMagick/rmimage.c', line 7043
VALUE
Image_fuzz_eq(VALUE self, VALUE fuzz)
{
Image *image = rm_check_frozen(self);
image->fuzz = rm_fuzz_to_dbl(fuzz);
return fuzz;
}
|
#fx(expression, channel = Magick::AllChannels) ⇒ Magick::Image #fx(expression, *channels) ⇒ Magick::Image
Apply fx on the image.
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# File 'ext/RMagick/rmimage.c', line 7065
VALUE
Image_fx(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
char *expression;
ChannelType channels;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
// There must be exactly 1 remaining argument.
if (argc == 0)
{
rb_raise(rb_eArgError, "wrong number of arguments (0 for 1 or more)");
}
else if (argc > 1)
{
raise_ChannelType_error(argv[argc-1]);
}
expression = StringValueCStr(argv[0]);
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
BEGIN_CHANNEL_MASK(image, channels);
new_image = FxImage(image, expression, exception);
CHANGE_RESULT_CHANNEL_MASK(new_image);
END_CHANNEL_MASK(image);
#else
new_image = FxImageChannel(image, channels, expression, exception);
#endif
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#gamma ⇒ Float
Get the gamma level of the image.
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# File 'ext/RMagick/rmimage.c', line 7108
VALUE
Image_gamma(VALUE self)
{
IMPLEMENT_ATTR_READER(Image, gamma, dbl);
}
|
#gamma=(val) ⇒ Float
Set the gamma level of the image.
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# File 'ext/RMagick/rmimage.c', line 7120
VALUE
Image_gamma_eq(VALUE self, VALUE val)
{
IMPLEMENT_ATTR_WRITER(Image, gamma, dbl);
}
|
#gamma_channel(gamma, channel = Magick::AllChannels) ⇒ Magick::Image #gamma_channel(gamma, *channels) ⇒ Magick::Image
Apply gamma to a channel.
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# File 'ext/RMagick/rmimage.c', line 7142
VALUE
Image_gamma_channel(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
ChannelType channels;
double gamma;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
// There must be exactly one remaining argument.
if (argc == 0)
{
rb_raise(rb_eArgError, "missing gamma argument");
}
else if (argc > 1)
{
raise_ChannelType_error(argv[argc-1]);
}
gamma = NUM2DBL(argv[0]);
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
BEGIN_CHANNEL_MASK(new_image, channels);
GammaImage(new_image, gamma, exception);
END_CHANNEL_MASK(new_image);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
GammaImageChannel(new_image, channels, gamma);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#gamma_correct(red_gamma, green_gamma = red_gamma, blue_gamma = green_gamma) ⇒ Magick::Image
gamma-correct an image.
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# File 'ext/RMagick/rmimage.c', line 7190
VALUE
Image_gamma_correct(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
double red_gamma, green_gamma, blue_gamma;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
switch (argc)
{
case 1:
red_gamma = NUM2DBL(argv[0]);
green_gamma = blue_gamma = red_gamma;
break;
case 2:
red_gamma = NUM2DBL(argv[0]);
green_gamma = NUM2DBL(argv[1]);
blue_gamma = green_gamma;
break;
case 3:
case 4:
red_gamma = NUM2DBL(argv[0]);
green_gamma = NUM2DBL(argv[1]);
blue_gamma = NUM2DBL(argv[2]);
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 to 3)", argc);
break;
}
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
#endif
if ((red_gamma == green_gamma) && (green_gamma == blue_gamma))
{
#if defined(IMAGEMAGICK_7)
BEGIN_CHANNEL_MASK(new_image, (ChannelType) (RedChannel | GreenChannel | BlueChannel));
GammaImage(new_image, red_gamma, exception);
END_CHANNEL_MASK(new_image);
#else
GammaImageChannel(new_image, (ChannelType) (RedChannel | GreenChannel | BlueChannel), red_gamma);
#endif
}
else
{
#if defined(IMAGEMAGICK_7)
BEGIN_CHANNEL_MASK(new_image, RedChannel);
GammaImage(new_image, red_gamma, exception);
END_CHANNEL_MASK(new_image);
BEGIN_CHANNEL_MASK(new_image, GreenChannel);
GammaImage(new_image, green_gamma, exception);
END_CHANNEL_MASK(new_image);
BEGIN_CHANNEL_MASK(new_image, BlueChannel);
GammaImage(new_image, blue_gamma, exception);
END_CHANNEL_MASK(new_image);
#else
GammaImageChannel(new_image, RedChannel, red_gamma);
GammaImageChannel(new_image, GreenChannel, green_gamma);
GammaImageChannel(new_image, BlueChannel, blue_gamma);
#endif
}
#if defined(IMAGEMAGICK_7)
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#gaussian_blur(radius = 0.0, sigma = 1.0) ⇒ Magick::Image
Blur the image.
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# File 'ext/RMagick/rmimage.c', line 7278
VALUE
Image_gaussian_blur(int argc, VALUE *argv, VALUE self)
{
return effect_image(self, argc, argv, GaussianBlurImage);
}
|
#gaussian_blur_channel(radius = 0.0, sigma = 1.0, channel = Magick::AllChannels) ⇒ Magick::Image #gaussian_blur_channel(radius = 0.0, sigma = 1.0, *channels) ⇒ Magick::Image
Blur the image on a channel.
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# File 'ext/RMagick/rmimage.c', line 7300
VALUE
Image_gaussian_blur_channel(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
ChannelType channels;
ExceptionInfo *exception;
double radius = 0.0, sigma = 1.0;
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
// There can be 0, 1, or 2 remaining arguments.
switch (argc)
{
case 2:
sigma = NUM2DBL(argv[1]);
/* Fall thru */
case 1:
radius = NUM2DBL(argv[0]);
/* Fall thru */
case 0:
break;
default:
raise_ChannelType_error(argv[argc-1]);
}
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
BEGIN_CHANNEL_MASK(image, channels);
new_image = GaussianBlurImage(image, radius, sigma, exception);
CHANGE_RESULT_CHANNEL_MASK(new_image);
END_CHANNEL_MASK(image);
rm_check_exception(exception, new_image, DestroyOnError);
#else
new_image = GaussianBlurImageChannel(image, channels, radius, sigma, exception);
rm_check_exception(exception, new_image, DestroyOnError);
#endif
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#geometry ⇒ String
Get the preferred size of the image when encoding.
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# File 'ext/RMagick/rmimage.c', line 7350
VALUE
Image_geometry(VALUE self)
{
IMPLEMENT_ATTR_READER(Image, geometry, str);
}
|
#geometry=(geometry) ⇒ String
Set the preferred size of the image when encoding.
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# File 'ext/RMagick/rmimage.c', line 7364
VALUE
Image_geometry_eq(VALUE self, VALUE geometry)
{
Image *image;
VALUE geom_str;
char *geom;
image = rm_check_frozen(self);
if (geometry == Qnil)
{
magick_free(image->geometry);
image->geometry = NULL;
return self;
}
geom_str = rb_String(geometry);
geom = StringValueCStr(geom_str);
if (!IsGeometry(geom))
{
rb_raise(rb_eTypeError, "invalid geometry: %s", geom);
}
magick_clone_string(&image->geometry, geom);
RB_GC_GUARD(geom_str);
return geometry;
}
|
#get_exif_by_entry(*entry) ⇒ Object
Retrieve EXIF data by entry or all. If one or more entry names specified, return the values associated with the entries. If no entries specified, return all entries and values. The return value is an array of [name,value] arrays.
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# File 'lib/rmagick_internal.rb', line 882 def get_exif_by_entry(*entry) ary = [] if entry.length.zero? exif_data = self['EXIF:*'] exif_data.split("\n").each { |exif| ary.push(exif.split('=')) } if exif_data else get_exif_by_entry # ensure properties is populated with exif data entry.each do |name| rval = self["EXIF:#{name}"] ary.push([name, rval]) end end ary end |
#get_exif_by_number(*tag) ⇒ Object
Retrieve EXIF data by tag number or all tag/value pairs. The return value is a hash.
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# File 'lib/rmagick_internal.rb', line 898 def get_exif_by_number(*tag) hash = {} if tag.length.zero? exif_data = self['EXIF:!'] if exif_data exif_data.split("\n").each do |exif| tag, value = exif.split('=') tag = tag[1, 4].hex hash[tag] = value end end else get_exif_by_number # ensure properties is populated with exif data tag.each do |num| rval = self[sprintf('#%04X', num.to_i)] hash[num] = rval == 'unknown' ? nil : rval end end hash end |
#get_iptc_dataset(ds) ⇒ Object
Retrieve IPTC information by record number:dataset tag constant defined in Magick::IPTC, above.
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# File 'lib/rmagick_internal.rb', line 921 def get_iptc_dataset(ds) self['IPTC:' + ds] end |
#get_pixels(x_arg, y_arg, cols_arg, rows_arg) ⇒ Array<Magick::Pixel>
Gets the pixels from the specified rectangle within the image.
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# File 'ext/RMagick/rmimage.c', line 7406
VALUE
Image_get_pixels(VALUE self, VALUE x_arg, VALUE y_arg, VALUE cols_arg, VALUE rows_arg)
{
Image *image;
ExceptionInfo *exception;
long x, y;
unsigned long columns, rows;
long size, n;
VALUE pixel_ary;
#if defined(IMAGEMAGICK_7)
const Quantum *pixels;
#else
const PixelPacket *pixels;
const IndexPacket *indexes;
#endif
image = rm_check_destroyed(self);
x = NUM2LONG(x_arg);
y = NUM2LONG(y_arg);
columns = NUM2ULONG(cols_arg);
rows = NUM2ULONG(rows_arg);
if ((x+columns) > image->columns || (y+rows) > image->rows)
{
rb_raise(rb_eRangeError, "geometry (%lux%lu%+ld%+ld) exceeds image bounds",
columns, rows, x, y);
}
// Cast AcquireImagePixels to get rid of the const qualifier. We're not going
// to change the pixels but I don't want to make "pixels" const.
exception = AcquireExceptionInfo();
pixels = GetVirtualPixels(image, x, y, columns, rows, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
// If the function failed, return a 0-length array.
if (!pixels)
{
return rb_ary_new();
}
// Allocate an array big enough to contain the PixelPackets.
size = (long)(columns * rows);
pixel_ary = rb_ary_new2(size);
#if defined(IMAGEMAGICK_6)
indexes = GetVirtualIndexQueue(image);
#endif
// Convert the PixelPackets to Magick::Pixel objects
for (n = 0; n < size; n++)
{
#if defined(IMAGEMAGICK_7)
PixelPacket color;
memset(&color, 0, sizeof(color));
color.red = GetPixelRed(image, pixels);
color.green = GetPixelGreen(image, pixels);
color.blue = GetPixelBlue(image, pixels);
color.alpha = GetPixelAlpha(image, pixels);
color.black = GetPixelBlack(image, pixels);
rb_ary_store(pixel_ary, n, Pixel_from_PixelPacket(&color));
pixels += GetPixelChannels(image);
#else
MagickPixel mpp;
mpp.red = GetPixelRed(pixels);
mpp.green = GetPixelGreen(pixels);
mpp.blue = GetPixelBlue(pixels);
mpp.opacity = GetPixelOpacity(pixels);
if (indexes)
{
mpp.index = GetPixelIndex(indexes + n);
}
rb_ary_store(pixel_ary, n, Pixel_from_MagickPixel(&mpp));
pixels++;
#endif
}
return pixel_ary;
}
|
#gravity ⇒ Magick::GravityType
Get the direction that the image gravitates within the composite.
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# File 'ext/RMagick/rmimage.c', line 14428
VALUE Image_gravity(VALUE self)
{
Image *image = rm_check_destroyed(self);
return GravityType_find(image->gravity);
}
|
#gravity=(gravity) ⇒ Magick::GravityType
Set the direction that the image gravitates within the composite.
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# File 'ext/RMagick/rmimage.c', line 14441
VALUE Image_gravity_eq(VALUE self, VALUE gravity)
{
Image *image = rm_check_frozen(self);
VALUE_TO_ENUM(gravity, image->gravity, GravityType);
return gravity;
}
|
#gray? ⇒ Boolean
Return true if all the pixels in the image have the same red, green, and blue intensities.
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# File 'ext/RMagick/rmimage.c', line 7545
VALUE
Image_gray_q(VALUE self)
{
#if defined(HAVE_SETIMAGEGRAY)
return has_attribute(self, (MagickBooleanType (*)(const Image *, ExceptionInfo *))SetImageGray);
#else
#if defined(IMAGEMAGICK_GREATER_THAN_EQUAL_6_8_9)
return has_attribute(self, IsGrayImage);
#else
// For ImageMagick 6.7
Image *image;
ColorspaceType colorspace;
VALUE ret;
image = rm_check_destroyed(self);
colorspace = image->colorspace;
if (image->colorspace == sRGBColorspace || image->colorspace == TransparentColorspace) {
// Workaround
// If image colorspace has non-RGBColorspace, IsGrayImage() always return false.
image->colorspace = RGBColorspace;
}
ret = has_attribute(self, IsGrayImage);
image->colorspace = colorspace;
return ret;
#endif
#endif
}
|
#grey? ⇒ Boolean
Return true if all the pixels in the image have the same red, green, and blue intensities.
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# File 'ext/RMagick/rmimage.c', line 7545
VALUE
Image_gray_q(VALUE self)
{
#if defined(HAVE_SETIMAGEGRAY)
return has_attribute(self, (MagickBooleanType (*)(const Image *, ExceptionInfo *))SetImageGray);
#else
#if defined(IMAGEMAGICK_GREATER_THAN_EQUAL_6_8_9)
return has_attribute(self, IsGrayImage);
#else
// For ImageMagick 6.7
Image *image;
ColorspaceType colorspace;
VALUE ret;
image = rm_check_destroyed(self);
colorspace = image->colorspace;
if (image->colorspace == sRGBColorspace || image->colorspace == TransparentColorspace) {
// Workaround
// If image colorspace has non-RGBColorspace, IsGrayImage() always return false.
image->colorspace = RGBColorspace;
}
ret = has_attribute(self, IsGrayImage);
image->colorspace = colorspace;
return ret;
#endif
#endif
}
|
#histogram? ⇒ Boolean
Return true if has 1024 unique colors or less.
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# File 'ext/RMagick/rmimage.c', line 7580
VALUE
Image_histogram_q(VALUE self)
{
return has_attribute(self, IsHistogramImage);
}
|
#image_type ⇒ Magick::ImageType
Get the image type classification. For example, GrayscaleType. Don’t confuse this attribute with the format, that is “GIF” or “JPG”.
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# File 'ext/RMagick/rmimage.c', line 14456
VALUE Image_image_type(VALUE self)
{
Image *image;
ImageType type;
#if defined(IMAGEMAGICK_6)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
#if defined(IMAGEMAGICK_7)
type = GetImageType(image);
#else
exception = AcquireExceptionInfo();
type = GetImageType(image, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#endif
return ImageType_find(type);
}
|
#image_type=(image_type) ⇒ Magick::ImageType
Set the image type classification.
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# File 'ext/RMagick/rmimage.c', line 14485
VALUE Image_image_type_eq(VALUE self, VALUE image_type)
{
Image *image;
ImageType type;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_frozen(self);
VALUE_TO_ENUM(image_type, type, ImageType);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
SetImageType(image, type, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
SetImageType(image, type);
#endif
return image_type;
}
|
#implode(amount = 0.50) ⇒ Magick::Image
Implode the image by the specified percentage.
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# File 'ext/RMagick/rmimage.c', line 7593
VALUE
Image_implode(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
double amount = 0.50;
ExceptionInfo *exception;
switch (argc)
{
case 1:
amount = NUM2DBL(argv[0]);
case 0:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
}
image = rm_check_destroyed(self);
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
new_image = ImplodeImage(image, amount, image->interpolate, exception);
#else
new_image = ImplodeImage(image, amount, exception);
#endif
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#store_pixels(x, y, columns, rows, map, pixels, type = Magick::CharPixel) ⇒ Magick::Image
Store image pixel data from an array.
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# File 'ext/RMagick/rmimage.c', line 7642
VALUE
Image_import_pixels(int argc, VALUE *argv, VALUE self)
{
Image *image;
long x_off, y_off;
unsigned long cols, rows;
unsigned long n, npixels;
long buffer_l;
char *map;
VALUE pixel_arg, pixel_ary;
StorageType stg_type = CharPixel;
size_t type_sz, map_l;
Quantum *pixels = NULL;
double *fpixels = NULL;
void *buffer;
unsigned int okay;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_frozen(self);
switch (argc)
{
case 7:
VALUE_TO_ENUM(argv[6], stg_type, StorageType);
case 6:
x_off = NUM2LONG(argv[0]);
y_off = NUM2LONG(argv[1]);
cols = NUM2ULONG(argv[2]);
rows = NUM2ULONG(argv[3]);
map = StringValueCStr(argv[4]);
pixel_arg = argv[5];
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 6 or 7)", argc);
break;
}
if (x_off < 0 || y_off < 0 || cols <= 0 || rows <= 0)
{
rb_raise(rb_eArgError, "invalid import geometry");
}
map_l = rm_strnlen_s(map, MaxTextExtent);
npixels = cols * rows * map_l;
// Assume that any object that responds to :to_str is a string buffer containing
// binary pixel data.
if (rb_respond_to(pixel_arg, rb_intern("to_str")))
{
buffer = (void *)rm_str2cstr(pixel_arg, &buffer_l);
switch (stg_type)
{
case CharPixel:
type_sz = 1;
break;
case ShortPixel:
type_sz = sizeof(unsigned short);
break;
case LongPixel:
type_sz = sizeof(unsigned long);
break;
case DoublePixel:
type_sz = sizeof(double);
break;
case FloatPixel:
type_sz = sizeof(float);
break;
case QuantumPixel:
type_sz = sizeof(Quantum);
break;
default:
rb_raise(rb_eArgError, "unsupported storage type %s", StorageType_name(stg_type));
break;
}
if (buffer_l % type_sz != 0)
{
rb_raise(rb_eArgError, "pixel buffer must be an exact multiple of the storage type size");
}
if ((buffer_l / type_sz) % map_l != 0)
{
rb_raise(rb_eArgError, "pixel buffer must contain an exact multiple of the map length");
}
if ((unsigned long)(buffer_l / type_sz) < npixels)
{
rb_raise(rb_eArgError, "pixel buffer too small (need %lu channel values, got %"RMIuSIZE")",
npixels, buffer_l/type_sz);
}
}
// Otherwise convert the argument to an array and convert the array elements
// to binary pixel data.
else
{
// rb_Array converts an object that is not an array to an array if possible,
// and raises TypeError if it can't. It usually is possible.
pixel_ary = rb_Array(pixel_arg);
if (RARRAY_LEN(pixel_ary) % map_l != 0)
{
rb_raise(rb_eArgError, "pixel array must contain an exact multiple of the map length");
}
if ((unsigned long)RARRAY_LEN(pixel_ary) < npixels)
{
rb_raise(rb_eArgError, "pixel array too small (need %lu elements, got %ld)",
npixels, RARRAY_LEN(pixel_ary));
}
if (stg_type == DoublePixel || stg_type == FloatPixel)
{
fpixels = ALLOC_N(double, npixels);
for (n = 0; n < npixels; n++)
{
VALUE element = rb_ary_entry(pixel_ary, n);
if (rm_check_num2dbl(element))
{
fpixels[n] = NUM2DBL(element);
}
else
{
xfree(fpixels);
rb_raise(rb_eTypeError, "type mismatch: %s given", rb_class2name(CLASS_OF(element)));
}
}
buffer = (void *) fpixels;
stg_type = DoublePixel;
}
else
{
pixels = ALLOC_N(Quantum, npixels);
for (n = 0; n < npixels; n++)
{
VALUE element = rb_ary_entry(pixel_ary, n);
if (rm_check_num2dbl(element))
{
pixels[n] = NUM2DBL(element);
}
else
{
xfree(pixels);
rb_raise(rb_eTypeError, "type mismatch: %s given", rb_class2name(CLASS_OF(element)));
}
}
buffer = (void *) pixels;
stg_type = QuantumPixel;
}
}
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
okay = ImportImagePixels(image, x_off, y_off, cols, rows, map, stg_type, buffer, exception);
#else
okay = ImportImagePixels(image, x_off, y_off, cols, rows, map, stg_type, buffer);
#endif
// Free pixel array before checking for errors.
if (pixels)
{
xfree((void *)pixels);
}
if (fpixels)
{
xfree((void *)fpixels);
}
if (!okay)
{
#if defined(IMAGEMAGICK_7)
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
rm_check_image_exception(image, RetainOnError);
#endif
// Shouldn't get here...
rm_magick_error("ImportImagePixels failed with no explanation.");
}
#if defined(IMAGEMAGICK_7)
DestroyExceptionInfo(exception);
#endif
RB_GC_GUARD(pixel_arg);
RB_GC_GUARD(pixel_ary);
return self;
}
|
#initialize_copy(orig) ⇒ Magick::Image
Initialize copy, clone, dup.
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# File 'ext/RMagick/rmimage.c', line 4668
VALUE
Image_init_copy(VALUE copy, VALUE orig)
{
Image *image, *new_image;
image = rm_check_destroyed(orig);
new_image = rm_clone_image(image);
UPDATE_DATA_PTR(copy, new_image);
return copy;
}
|
#inspect ⇒ String
Override Object#inspect - return a string description of the image.
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# File 'ext/RMagick/rmimage.c', line 7978
VALUE
Image_inspect(VALUE self)
{
Image *image;
char buffer[MaxTextExtent]; // image description buffer
Data_Get_Struct(self, Image, image);
if (!image)
{
return rb_str_new2("#<Magick::Image: (destroyed)>");
}
build_inspect_string(image, buffer, sizeof(buffer));
return rb_str_new2(buffer);
}
|
#interlace ⇒ Magick::InterlaceType
Get the type of interlacing scheme (default NoInterlace). This option is used to specify the type of interlacing scheme for raw image formats such as RGB or YUV. NoInterlace means do not interlace, LineInterlace uses scanline interlacing, and PlaneInterlace uses plane interlacing. PartitionInterlace is like PlaneInterlace except the different planes are saved to individual files (e.g. image.R, image.G, and image.B).
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# File 'ext/RMagick/rmimage.c', line 8004
VALUE
Image_interlace(VALUE self)
{
Image *image = rm_check_destroyed(self);
return InterlaceType_find(image->interlace);
}
|
#interlace=(interlace) ⇒ Magick::InterlaceType
Set the type of interlacing scheme.
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# File 'ext/RMagick/rmimage.c', line 8018
VALUE
Image_interlace_eq(VALUE self, VALUE interlace)
{
Image *image = rm_check_frozen(self);
VALUE_TO_ENUM(interlace, image->interlace, InterlaceType);
return interlace;
}
|
#iptc_profile ⇒ String?
Return the IPTC profile as a String.
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# File 'ext/RMagick/rmimage.c', line 8032
VALUE
Image_iptc_profile(VALUE self)
{
Image *image;
const StringInfo *profile;
image = rm_check_destroyed(self);
profile = GetImageProfile(image, "iptc");
if (!profile)
{
return Qnil;
}
return rb_str_new((char *)profile->datum, (long)profile->length);
}
|
#iptc_profile=(profile) ⇒ String
Set the IPTC profile. The argument is a string.
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# File 'ext/RMagick/rmimage.c', line 8057
VALUE
Image_iptc_profile_eq(VALUE self, VALUE profile)
{
Image_delete_profile(self, rb_str_new2("iptc"));
if (profile != Qnil)
{
set_profile(self, "iptc", profile);
}
return profile;
}
|
#iterations ⇒ Object
These are undocumented methods. The writer is called only by Image#iterations=. The reader is only used by the unit tests!
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# File 'ext/RMagick/rmimage.c', line 8074
VALUE
Image_iterations(VALUE self)
{
IMPLEMENT_ATTR_READER(Image, iterations, int);
}
|
#iterations=(val) ⇒ Object
do not document! Only used by Image#iterations=
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# File 'ext/RMagick/rmimage.c', line 8079
VALUE
Image_iterations_eq(VALUE self, VALUE val)
{
IMPLEMENT_ATTR_WRITER(Image, iterations, int);
}
|
#level(black_point = 0.0, white_point = nil, gamma = nil) ⇒ Object
(Thanks to Al Evans for the suggestion.)
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# File 'lib/rmagick_internal.rb', line 950 def level(black_point = 0.0, white_point = nil, gamma = nil) black_point = Float(black_point) white_point ||= Magick::QuantumRange - black_point white_point = Float(white_point) gamma_arg = gamma gamma ||= 1.0 gamma = Float(gamma) if gamma.abs > 10.0 || white_point.abs <= 10.0 || white_point.abs < gamma.abs gamma, white_point = white_point, gamma white_point = Magick::QuantumRange - black_point unless gamma_arg end level2(black_point, white_point, gamma) end |
#level2(black_point = 0.0, white_point = Magick::QuantumRange, gamma = 1.0) ⇒ Magick::Image
Adjusts the levels of an image by scaling the colors falling between specified white and black points to the full available quantum range.
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# File 'ext/RMagick/rmimage.c', line 8095
VALUE
Image_level2(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
double black_point = 0.0, gamma_val = 1.0, white_point = (double)QuantumRange;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#else
char level[50];
#endif
image = rm_check_destroyed(self);
switch (argc)
{
case 0: // take all the defaults
break;
case 1:
black_point = NUM2DBL(argv[0]);
white_point = QuantumRange - black_point;
break;
case 2:
black_point = NUM2DBL(argv[0]);
white_point = NUM2DBL(argv[1]);
break;
case 3:
black_point = NUM2DBL(argv[0]);
white_point = NUM2DBL(argv[1]);
gamma_val = NUM2DBL(argv[2]);
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 3)", argc);
break;
}
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
LevelImage(new_image, black_point, white_point, gamma_val, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
snprintf(level, sizeof(level), "%gx%g+%g", black_point, white_point, gamma_val);
LevelImage(new_image, level);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#level_channel(aChannelType, black = 0.0, white = 1.0, gamma = Magick::QuantumRange) ⇒ Magick::Image
Similar to #level2 but applies to a single channel only.
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# File 'ext/RMagick/rmimage.c', line 8157
VALUE
Image_level_channel(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
double black_point = 0.0, gamma_val = 1.0, white_point = (double)QuantumRange;
ChannelType channel;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
switch (argc)
{
case 1: // take all the defaults
break;
case 2:
black_point = NUM2DBL(argv[1]);
white_point = QuantumRange - black_point;
break;
case 3:
black_point = NUM2DBL(argv[1]);
white_point = NUM2DBL(argv[2]);
break;
case 4:
black_point = NUM2DBL(argv[1]);
white_point = NUM2DBL(argv[2]);
gamma_val = NUM2DBL(argv[3]);
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 to 4)", argc);
break;
}
VALUE_TO_ENUM(argv[0], channel, ChannelType);
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
BEGIN_CHANNEL_MASK(new_image, channel);
LevelImage(new_image, black_point, white_point, gamma_val, exception);
END_CHANNEL_MASK(new_image);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
LevelImageChannel(new_image, channel, black_point, white_point, gamma_val);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#level_colors(black_color = "black", white_color = "white", invert = true, channel = Magick::AllChannels) ⇒ Magick::Image #level_colors(black_color = "black", white_color = "white", invert = true, *channels) ⇒ Magick::Image
When invert is true, black and white will be mapped to the black_color and white_color colors, compressing all other colors linearly. When invert is false, black and white will be mapped to the black_color and white_color colors, stretching all other colors linearly.
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# File 'ext/RMagick/rmimage.c', line 8229
VALUE
Image_level_colors(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
MagickPixel black_color, white_color;
ChannelType channels;
MagickBooleanType invert = MagickTrue;
MagickBooleanType status;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
rm_init_magickpixel(image, &white_color);
rm_init_magickpixel(image, &black_color);
switch (argc)
{
case 3:
invert = RTEST(argv[2]);
case 2:
Color_to_MagickPixel(image, &white_color, argv[1]);
Color_to_MagickPixel(image, &black_color, argv[0]);
break;
case 1:
rm_set_magickpixel(&white_color, "white");
Color_to_MagickPixel(image, &black_color, argv[0]);
break;
case 0:
rm_set_magickpixel(&white_color, "white");
rm_set_magickpixel(&black_color, "black");
break;
default:
raise_ChannelType_error(argv[argc-1]);
break;
}
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
BEGIN_CHANNEL_MASK(new_image, channels);
status = LevelImageColors(new_image, &black_color, &white_color, invert, exception);
END_CHANNEL_MASK(new_image);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
status = LevelColorsImageChannel(new_image, channels, &black_color, &white_color, invert);
rm_check_image_exception(new_image, DestroyOnError);
#endif
if (!status)
{
rb_raise(rb_eRuntimeError, "LevelImageColors failed for unknown reason.");
}
return rm_image_new(new_image);
}
|
#levelize_channel(black_point, white_point = Magick::QuantumRange-black_point, gamma = 1.0, channel = Magick::AllChannels) ⇒ Magick::Image #levelize_channel(black_point, white_point = Magick::QuantumRange-black_point, gamma = 1.0, *channels) ⇒ Magick::Image
Maps black and white to the specified points. The reverse of #level_channel.
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# File 'ext/RMagick/rmimage.c', line 8312
VALUE
Image_levelize_channel(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
ChannelType channels;
double black_point, white_point;
double gamma = 1.0;
MagickBooleanType status;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
if (argc > 3)
{
raise_ChannelType_error(argv[argc-1]);
}
switch (argc)
{
case 3:
gamma = NUM2DBL(argv[2]);
case 2:
white_point = NUM2DBL(argv[1]);
black_point = NUM2DBL(argv[0]);
break;
case 1:
black_point = NUM2DBL(argv[0]);
white_point = QuantumRange - black_point;
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 or more)", argc);
break;
}
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
BEGIN_CHANNEL_MASK(new_image, channels);
status = LevelizeImage(new_image, black_point, white_point, gamma, exception);
END_CHANNEL_MASK(new_image);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
status = LevelizeImageChannel(new_image, channels, black_point, white_point, gamma);
rm_check_image_exception(new_image, DestroyOnError);
#endif
if (!status)
{
rb_raise(rb_eRuntimeError, "LevelizeImageChannel failed for unknown reason.");
}
return rm_image_new(new_image);
}
|
#linear_stretch(black_point, white_point = pixels-black_point) ⇒ Magick::Image
Linear with saturation stretch.
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# File 'ext/RMagick/rmimage.c', line 8384
VALUE
Image_linear_stretch(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
double black_point, white_point;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
get_black_white_point(image, argc, argv, &black_point, &white_point);
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
LinearStretchImage(new_image, black_point, white_point, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
LinearStretchImage(new_image, black_point, white_point);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#liquid_rescale(columns, rows, delta_x = 0.0, rigidity = 0.0) ⇒ Magick::Image
Rescale image with seam carving.
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# File 'ext/RMagick/rmimage.c', line 8422
VALUE
Image_liquid_rescale(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
unsigned long cols, rows;
double delta_x = 0.0;
double rigidity = 0.0;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
switch (argc)
{
case 4:
rigidity = NUM2DBL(argv[3]);
case 3:
delta_x = NUM2DBL(argv[2]);
case 2:
rows = NUM2ULONG(argv[1]);
cols = NUM2ULONG(argv[0]);
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 to 4)", argc);
break;
}
exception = AcquireExceptionInfo();
new_image = LiquidRescaleImage(image, cols, rows, delta_x, rigidity, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#magnify ⇒ Magick::Image
Scale an image proportionally to twice its size.
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# File 'ext/RMagick/rmimage.c', line 8570
VALUE
Image_magnify(VALUE self)
{
rm_check_destroyed(self);
return magnify(False, self, MagnifyImage);
}
|
#magnify! ⇒ Magick::Image
Scale an image proportionally to twice its size. In-place form of #magnify.
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# File 'ext/RMagick/rmimage.c', line 8585
VALUE
Image_magnify_bang(VALUE self)
{
rm_check_frozen(self);
return magnify(True, self, MagnifyImage);
}
|
#marshal_dump ⇒ Array<String>
Support Marshal.dump.
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# File 'ext/RMagick/rmimage.c', line 8599
VALUE
Image_marshal_dump(VALUE self)
{
Image *image;
Info *info;
unsigned char *blob;
size_t length;
VALUE ary;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
info = CloneImageInfo(NULL);
if (!info)
{
rb_raise(rb_eNoMemError, "not enough memory to initialize Info object");
}
ary = rb_ary_new2(2);
rb_ary_store(ary, 0, rb_str_new2(image->filename));
exception = AcquireExceptionInfo();
blob = ImageToBlob(info, image, &length, exception);
// Destroy info before raising an exception
DestroyImageInfo(info);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
rb_ary_store(ary, 1, rb_str_new((char *)blob, (long)length));
magick_free((void*)blob);
return ary;
}
|
#marshal_load(ary) ⇒ Object
Support Marshal.load.
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# File 'ext/RMagick/rmimage.c', line 8641
VALUE
Image_marshal_load(VALUE self, VALUE ary)
{
VALUE blob, filename;
Info *info;
Image *image;
ExceptionInfo *exception;
info = CloneImageInfo(NULL);
if (!info)
{
rb_raise(rb_eNoMemError, "not enough memory to initialize Info object");
}
filename = rb_ary_shift(ary);
blob = rb_ary_shift(ary);
filename = StringValue(filename);
blob = StringValue(blob);
exception = AcquireExceptionInfo();
if (filename != Qnil)
{
strlcpy(info->filename, RSTRING_PTR(filename), sizeof(info->filename));
}
image = BlobToImage(info, RSTRING_PTR(blob), RSTRING_LEN(blob), exception);
// Destroy info before raising an exception
DestroyImageInfo(info);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
UPDATE_DATA_PTR(self, image);
return self;
}
|
#mask ⇒ Magick::Image #mask(image) ⇒ Magick::Image
Get/Sets an image clip mask created from the specified mask image. The mask image must have the same dimensions as the image being masked. If not, the mask image is resized to match. If the mask image has an alpha channel the opacity of each pixel is used to define the mask. Otherwise, the intensity (gray level) of each pixel is used.
In general, if the mask image does not have an alpha channel, a white pixel in the mask prevents changes to the corresponding pixel in the image being masked, while a black pixel allows changes. A pixel that is neither black nor white will allow partial changes depending on its intensity.
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# File 'ext/RMagick/rmimage.c', line 8862
VALUE
Image_mask(int argc, VALUE *argv, VALUE self)
{
VALUE mask;
Image *image;
image = rm_check_destroyed(self);
if (argc == 0)
{
return get_image_mask(image);
}
if (argc > 1)
{
rb_raise(rb_eArgError, "wrong number of arguments (expected 0 or 1, got %d)", argc);
}
rb_check_frozen(self);
mask = argv[0];
return set_image_mask(image, mask);
}
|
#matte_color ⇒ String
Return the matte color.
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# File 'ext/RMagick/rmimage.c', line 8889
VALUE
Image_matte_color(VALUE self)
{
Image *image = rm_check_destroyed(self);
return rm_pixelcolor_to_color_name(image, &image->matte_color);
}
|
#matte_color=(color) ⇒ Magick::Pixel, String
Set the matte color.
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# File 'ext/RMagick/rmimage.c', line 8902
VALUE
Image_matte_color_eq(VALUE self, VALUE color)
{
Image *image = rm_check_frozen(self);
Color_to_PixelColor(&image->matte_color, color);
return color;
}
|
#matte_fill_to_border(x, y) ⇒ Object
Make transparent any neighbor pixel that is not the border color.
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# File 'lib/rmagick_internal.rb', line 1001 def matte_fill_to_border(x, y) f = copy f.alpha(OpaqueAlphaChannel) unless f.alpha? f.matte_flood_fill(border_color, x, y, FillToBorderMethod, alpha: TransparentAlpha) end |
#Image ⇒ Magick::Image
Makes transparent all the pixels that are the same color as the pixel at x, y, and are neighbors.
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# File 'ext/RMagick/rmimage.c', line 8922
VALUE
Image_matte_flood_fill(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
PixelColor target;
Quantum alpha;
long x, y;
PaintMethod method;
DrawInfo *draw_info;
MagickPixel target_mpp;
MagickBooleanType invert;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
if (argc != 5)
{
rb_raise(rb_eArgError, "wrong number of arguments (%d for 5)", argc);
}
alpha = get_named_alpha_value(argv[4]);
Color_to_PixelColor(&target, argv[0]);
VALUE_TO_ENUM(argv[3], method, PaintMethod);
if (!(method == FloodfillMethod || method == FillToBorderMethod))
{
rb_raise(rb_eArgError, "paint method_obj must be FloodfillMethod or "
"FillToBorderMethod (%d given)", method);
}
x = NUM2LONG(argv[1]);
y = NUM2LONG(argv[2]);
if ((unsigned long)x > image->columns || (unsigned long)y > image->rows)
{
rb_raise(rb_eArgError, "target out of range. %ldx%ld given, image is %"RMIuSIZE"x%"RMIuSIZE"",
x, y, image->columns, image->rows);
}
new_image = rm_clone_image(image);
// FloodfillPaintImage looks for the opacity in the DrawInfo.fill field.
draw_info = CloneDrawInfo(NULL, NULL);
if (!draw_info)
{
rb_raise(rb_eNoMemError, "not enough memory to continue");
}
#if defined(IMAGEMAGICK_7)
draw_info->fill.alpha = alpha;
#else
draw_info->fill.opacity = QuantumRange - alpha;
#endif
if (method == FillToBorderMethod)
{
invert = MagickTrue;
target_mpp.red = (MagickRealType) image->border_color.red;
target_mpp.green = (MagickRealType) image->border_color.green;
target_mpp.blue = (MagickRealType) image->border_color.blue;
}
else
{
invert = MagickFalse;
target_mpp.red = (MagickRealType) target.red;
target_mpp.green = (MagickRealType) target.green;
target_mpp.blue = (MagickRealType) target.blue;
}
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
BEGIN_CHANNEL_MASK(new_image, OpacityChannel);
FloodfillPaintImage(new_image, draw_info, &target_mpp, x, y, invert, exception);
END_CHANNEL_MASK(new_image);
DestroyDrawInfo(draw_info);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
FloodfillPaintImage(new_image, OpacityChannel, draw_info, &target_mpp, x, y, invert);
DestroyDrawInfo(draw_info);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#matte_floodfill(x, y) ⇒ Object
Make transparent any pixel that matches the color of the pixel at (x,y) and is a neighbor.
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# File 'lib/rmagick_internal.rb', line 993 def matte_floodfill(x, y) f = copy f.alpha(OpaqueAlphaChannel) unless f.alpha? target = f.pixel_color(x, y) f.matte_flood_fill(target, x, y, FloodfillMethod, alpha: TransparentAlpha) end |
#matte_point(x, y) ⇒ Object
Make the pixel at (x,y) transparent.
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# File 'lib/rmagick_internal.rb', line 973 def matte_point(x, y) f = copy f.alpha(OpaqueAlphaChannel) unless f.alpha? pixel = f.pixel_color(x, y) pixel.alpha = TransparentAlpha f.pixel_color(x, y, pixel) f end |
#matte_replace(x, y) ⇒ Object
Make transparent all pixels that are the same color as the pixel at (x, y).
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# File 'lib/rmagick_internal.rb', line 984 def matte_replace(x, y) f = copy f.alpha(OpaqueAlphaChannel) unless f.alpha? target = f.pixel_color(x, y) f.transparent(target) end |
#matte_reset! ⇒ Object
Make all pixels transparent.
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# File 'lib/rmagick_internal.rb', line 1008 def matte_reset! alpha(TransparentAlphaChannel) self end |
#mean_error_per_pixel ⇒ Float
Get the mean error per pixel computed when a image is color reduced.
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# File 'ext/RMagick/rmimage.c', line 9051
VALUE
Image_mean_error_per_pixel(VALUE self)
{
IMPLEMENT_ATTR_READERF(Image, mean_error_per_pixel, error.mean_error_per_pixel, dbl);
}
|
#median_filter(radius = 0.0) ⇒ Magick::Image
Apply a digital filter that improves the quality of a noisy image. Each pixel is replaced by the median in a set of neighboring pixels as defined by radius.
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# File 'ext/RMagick/rmimage.c', line 9018
VALUE
Image_median_filter(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
double radius = 0.0;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
switch (argc)
{
case 1:
radius = NUM2DBL(argv[0]);
case 0:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
break;
}
exception = AcquireExceptionInfo();
new_image = StatisticImage(image, MedianStatistic, (size_t)radius, (size_t)radius, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#mime_type ⇒ String?
Return the officially registered (or de facto) MIME media-type corresponding to the image format.
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# File 'ext/RMagick/rmimage.c', line 9063
VALUE
Image_mime_type(VALUE self)
{
Image *image;
char *type;
VALUE mime_type;
image = rm_check_destroyed(self);
type = MagickToMime(image->magick);
if (!type)
{
return Qnil;
}
mime_type = rb_str_new2(type);
// The returned string must be deallocated by the user.
magick_free(type);
RB_GC_GUARD(mime_type);
return mime_type;
}
|
#minify ⇒ Magick::Image
Scale an image proportionally to half its size.
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# File 'ext/RMagick/rmimage.c', line 9093
VALUE
Image_minify(VALUE self)
{
rm_check_destroyed(self);
return magnify(False, self, MinifyImage);
}
|
#minify! ⇒ Magick::Image
Scale an image proportionally to half its size. In-place form of #minify.
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# File 'ext/RMagick/rmimage.c', line 9107
VALUE
Image_minify_bang(VALUE self)
{
rm_check_frozen(self);
return magnify(True, self, MinifyImage);
}
|
#modulate(brightness = 1.0, saturation = 1.0, hue = 1.0) ⇒ Magick::Image
Changes the brightness, saturation, and hue.
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# File 'ext/RMagick/rmimage.c', line 9124
VALUE
Image_modulate(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
double pct_brightness = 100.0,
pct_saturation = 100.0,
pct_hue = 100.0;
char modulate[100];
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
switch (argc)
{
case 3:
pct_hue = 100*NUM2DBL(argv[2]);
case 2:
pct_saturation = 100*NUM2DBL(argv[1]);
case 1:
pct_brightness = 100*NUM2DBL(argv[0]);
break;
case 0:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 3)", argc);
break;
}
if (pct_brightness <= 0.0)
{
rb_raise(rb_eArgError, "brightness is %g%%, must be positive", pct_brightness);
}
snprintf(modulate, sizeof(modulate), "%f%%,%f%%,%f%%", pct_brightness, pct_saturation, pct_hue);
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
ModulateImage(new_image, modulate, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
ModulateImage(new_image, modulate);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#monitor=(monitor) ⇒ Proc
Establish a progress monitor.
-
A progress monitor is a callable object. Save the monitor proc as the client_data and establish ‘progress_monitor’ as the monitor exit. When ‘progress_monitor’ is called, retrieve the proc and call it.
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# File 'ext/RMagick/rmimage.c', line 9190
VALUE
Image_monitor_eq(VALUE self, VALUE monitor)
{
Image *image = rm_check_frozen(self);
if (NIL_P(monitor))
{
image->progress_monitor = NULL;
}
else
{
SetImageProgressMonitor(image, rm_progress_monitor, (void *)monitor);
}
return monitor;
}
|
#monochrome? ⇒ Boolean
Return true if all the pixels in the image have the same red, green, and blue intensities and the intensity is either 0 or QuantumRange.
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# File 'ext/RMagick/rmimage.c', line 9214
VALUE
Image_monochrome_q(VALUE self)
{
#if defined(IMAGEMAGICK_7)
return has_image_attribute(self, IsImageMonochrome);
#else
return has_attribute(self, IsMonochromeImage);
#endif
}
|
#montage ⇒ String
Tile size and offset within an image montage. Only valid for montage images.
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# File 'ext/RMagick/rmimage.c', line 9230
VALUE
Image_montage(VALUE self)
{
IMPLEMENT_ATTR_READER(Image, montage, str);
}
|
#morphology(method_v, iterations, kernel_v) ⇒ Magick::Image
Apply a user supplied kernel to the image according to the given mophology method.
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# File 'ext/RMagick/rmimage.c', line 4365
VALUE
Image_morphology(VALUE self, VALUE method_v, VALUE iterations, VALUE kernel_v)
{
static VALUE default_channels_const = 0;
if(!default_channels_const)
{
default_channels_const = rb_const_get(Module_Magick, rb_intern("DefaultChannels"));
}
return Image_morphology_channel(self, default_channels_const, method_v, iterations, kernel_v);
}
|
#morphology_channel(channel_v, method_v, iterations, kernel_v) ⇒ Magick::Image
Apply a user supplied kernel to the image channel according to the given mophology method.
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# File 'ext/RMagick/rmimage.c', line 4391
VALUE
Image_morphology_channel(VALUE self, VALUE channel_v, VALUE method_v, VALUE iterations, VALUE kernel_v)
{
Image *image, *new_image;
ExceptionInfo *exception;
MorphologyMethod method;
ChannelType channel;
KernelInfo *kernel;
image = rm_check_destroyed(self);
VALUE_TO_ENUM(method_v, method, MorphologyMethod);
VALUE_TO_ENUM(channel_v, channel, ChannelType);
Check_Type(iterations, T_FIXNUM);
if (TYPE(kernel_v) == T_STRING)
{
kernel_v = rb_class_new_instance(1, &kernel_v, Class_KernelInfo);
}
if (!rb_obj_is_kind_of(kernel_v, Class_KernelInfo))
{
rb_raise(rb_eArgError, "expected String or Magick::KernelInfo");
}
Data_Get_Struct(kernel_v, KernelInfo, kernel);
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
BEGIN_CHANNEL_MASK(image, channel);
new_image = MorphologyImage(image, method, NUM2LONG(iterations), kernel, exception);
CHANGE_RESULT_CHANNEL_MASK(new_image);
END_CHANNEL_MASK(image);
#else
new_image = MorphologyImageChannel(image, channel, method, NUM2LONG(iterations), kernel, exception);
#endif
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#motion_blur(radius = 0.0, sigma = 1.0, angle = 0.0) ⇒ Magick::Image
Simulate motion blur. Convolve the image with a Gaussian operator of the given radius and standard deviation (sigma). For reasonable results, radius should be larger than sigma. Use a radius of 0 and motion_blur selects a suitable radius for you. Angle gives the angle of the blurring motion.
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# File 'ext/RMagick/rmimage.c', line 9303
VALUE
Image_motion_blur(int argc, VALUE *argv, VALUE self)
{
rm_check_destroyed(self);
return motion_blur(argc, argv, self, MotionBlurImage);
}
|
#negate(grayscale = false) ⇒ Magick::Image
Negate the colors in the reference image. The grayscale option means that only grayscale values within the image are negated.
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# File 'ext/RMagick/rmimage.c', line 9319
VALUE
Image_negate(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
unsigned int grayscale = MagickFalse;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
if (argc == 1)
{
grayscale = RTEST(argv[0]);
}
else if (argc > 1)
{
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
}
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
NegateImage(new_image, grayscale, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
NegateImage(new_image, grayscale);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#negate_channel(grayscale = false, channel = Magick::AllChannels) ⇒ Magick::Image #negate_channel(grayscale = false, *channels) ⇒ Magick::Image
Negate the colors on a particular channel. The grayscale option means that only grayscale values within the image are negated.
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# File 'ext/RMagick/rmimage.c', line 9371
VALUE
Image_negate_channel(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
ChannelType channels;
unsigned int grayscale = MagickFalse;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
// There can be at most 1 remaining argument.
if (argc > 1)
{
raise_ChannelType_error(argv[argc-1]);
}
else if (argc == 1)
{
grayscale = RTEST(argv[0]);
}
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
BEGIN_CHANNEL_MASK(new_image, channels);
NegateImage(new_image, grayscale, exception);
END_CHANNEL_MASK(new_image);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
NegateImageChannel(new_image, channels, grayscale);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#normalize ⇒ Magick::Image
Enhance the contrast of a color image by adjusting the pixels color to span the entire range of colors available.
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# File 'ext/RMagick/rmimage.c', line 9544
VALUE
Image_normalize(VALUE self)
{
Image *image, *new_image;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
NormalizeImage(new_image, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
NormalizeImage(new_image);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#normalize_channel(channel = Magick::AllChannels) ⇒ Magick::Image
Enhances the contrast of a color image by adjusting the pixel color to span the entire range of colors available. Only the specified channels are normalized.
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# File 'ext/RMagick/rmimage.c', line 9577
VALUE
Image_normalize_channel(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
ChannelType channels;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
// Ensure all arguments consumed.
if (argc > 0)
{
raise_ChannelType_error(argv[argc-1]);
}
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
BEGIN_CHANNEL_MASK(new_image, channels);
NormalizeImage(new_image, exception);
END_CHANNEL_MASK(new_image);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
NormalizeImageChannel(new_image, channels);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#normalized_maximum_error ⇒ Float
Get The normalized maximum error per pixel computed when an image is color reduced.
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# File 'ext/RMagick/rmimage.c', line 9628
VALUE
Image_normalized_maximum_error(VALUE self)
{
IMPLEMENT_ATTR_READERF(Image, normalized_maximum_error, error.normalized_maximum_error, dbl);
}
|
#normalized_mean_error ⇒ Float
Get the normalized mean error per pixel computed when an image is color reduced.
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# File 'ext/RMagick/rmimage.c', line 9617
VALUE
Image_normalized_mean_error(VALUE self)
{
IMPLEMENT_ATTR_READERF(Image, normalized_mean_error, error.normalized_mean_error, dbl);
}
|
#number_colors ⇒ Numeric
Return the number of unique colors in the image.
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# File 'ext/RMagick/rmimage.c', line 9640
VALUE
Image_number_colors(VALUE self)
{
Image *image;
ExceptionInfo *exception;
unsigned long n = 0;
image = rm_check_destroyed(self);
exception = AcquireExceptionInfo();
n = (unsigned long) GetNumberColors(image, NULL, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
return ULONG2NUM(n);
}
|
#offset ⇒ Number
Get the number of bytes to skip over when reading raw image.
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# File 'ext/RMagick/rmimage.c', line 9664
VALUE
Image_offset(VALUE self)
{
IMPLEMENT_ATTR_READER(Image, offset, long);
}
|
#offset=(val) ⇒ Number
Set the number of bytes to skip over when reading raw image.
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# File 'ext/RMagick/rmimage.c', line 9676
VALUE
Image_offset_eq(VALUE self, VALUE val)
{
IMPLEMENT_ATTR_WRITER(Image, offset, long);
}
|
#oil_paint(radius = 3.0) ⇒ Magick::Image
Apply a special effect filter that simulates an oil painting.
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# File 'ext/RMagick/rmimage.c', line 9690
VALUE
Image_oil_paint(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
double radius = 3.0;
ExceptionInfo *exception;
#if defined(IMAGEMAGICK_7)
double sigma = 1.0;
#endif
image = rm_check_destroyed(self);
switch (argc)
{
case 1:
radius = NUM2DBL(argv[0]);
case 0:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
break;
}
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
new_image = OilPaintImage(image, radius, sigma, exception);
#else
new_image = OilPaintImage(image, radius, exception);
#endif
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#opaque(target, fill) ⇒ Magick::Image
Change any pixel that matches target with the color defined by fill.
- By default a pixel must match the specified target color exactly.
- Use {Image#fuzz=} to set the amount of tolerance acceptable to consider two colors as the
same.
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# File 'ext/RMagick/rmimage.c', line 9738
VALUE
Image_opaque(VALUE self, VALUE target, VALUE fill)
{
Image *image, *new_image;
MagickPixel target_pp;
MagickPixel fill_pp;
MagickBooleanType okay;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
// Allow color name or Pixel
Color_to_MagickPixel(image, &target_pp, target);
Color_to_MagickPixel(image, &fill_pp, fill);
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
okay = OpaquePaintImage(new_image, &target_pp, &fill_pp, MagickFalse, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
okay = OpaquePaintImageChannel(new_image, DefaultChannels, &target_pp, &fill_pp, MagickFalse);
rm_check_image_exception(new_image, DestroyOnError);
#endif
if (!okay)
{
// Force exception
DestroyImage(new_image);
rm_ensure_result(NULL);
}
return rm_image_new(new_image);
}
|
#opaque? ⇒ Boolean
Returns true if all of the pixels in the receiver have an opacity value of OpaqueOpacity.
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# File 'ext/RMagick/rmimage.c', line 9877
VALUE
Image_opaque_q(VALUE self)
{
#if defined(IMAGEMAGICK_7)
return has_attribute(self, IsImageOpaque);
#else
return has_attribute(self, IsOpaqueImage);
#endif
}
|
#opaque_channel(target, fill, invert = false, fuzz = self.fuzz, channel = Magick::AllChannels) ⇒ Magick::Image #opaque_channel(target, fill, invert, fuzz, *channels) ⇒ Magick::Image
Changes all pixels having the target color to the fill color. If invert is true, changes all the pixels that are not the target color to the fill color.
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# File 'ext/RMagick/rmimage.c', line 9800
VALUE
Image_opaque_channel(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
MagickPixel target_pp, fill_pp;
ChannelType channels;
double keep, fuzz;
MagickBooleanType okay, invert = MagickFalse;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
if (argc > 4)
{
raise_ChannelType_error(argv[argc-1]);
}
// Default fuzz value is image's fuzz attribute.
fuzz = image->fuzz;
switch (argc)
{
case 4:
fuzz = NUM2DBL(argv[3]);
if (fuzz < 0.0)
{
rb_raise(rb_eArgError, "fuzz must be >= 0.0 (%g given)", fuzz);
}
case 3:
invert = RTEST(argv[2]);
case 2:
// Allow color name or Pixel
Color_to_MagickPixel(image, &fill_pp, argv[1]);
Color_to_MagickPixel(image, &target_pp, argv[0]);
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (got %d, expected 2 or more)", argc);
break;
}
new_image = rm_clone_image(image);
keep = new_image->fuzz;
new_image->fuzz = fuzz;
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
BEGIN_CHANNEL_MASK(new_image, channels);
okay = OpaquePaintImage(new_image, &target_pp, &fill_pp, invert, exception);
END_CHANNEL_MASK(new_image);
new_image->fuzz = keep;
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
okay = OpaquePaintImageChannel(new_image, channels, &target_pp, &fill_pp, invert);
new_image->fuzz = keep;
rm_check_image_exception(new_image, DestroyOnError);
#endif
if (!okay)
{
// Force exception
DestroyImage(new_image);
rm_ensure_result(NULL);
}
return rm_image_new(new_image);
}
|
#ordered_dither(threshold_map = '2x2') ⇒ Magick::Image
Dithers the image to a predefined pattern. The threshold_map argument defines the pattern to use.
-
Default threshold_map is ‘2x2’
-
Order of threshold_map must be 2, 3, or 4.
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# File 'ext/RMagick/rmimage.c', line 9898
VALUE
Image_ordered_dither(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
int order;
const char *threshold_map = "2x2";
ExceptionInfo *exception;
image = rm_check_destroyed(self);
if (argc > 1)
{
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
}
if (argc == 1)
{
if (TYPE(argv[0]) == T_STRING)
{
threshold_map = StringValueCStr(argv[0]);
}
else
{
order = NUM2INT(argv[0]);
if (order == 3)
{
threshold_map = "3x3";
}
else if (order == 4)
{
threshold_map = "4x4";
}
else if (order != 2)
{
rb_raise(rb_eArgError, "order must be 2, 3, or 4 (%d given)", order);
}
}
}
new_image = rm_clone_image(image);
exception = AcquireExceptionInfo();
OrderedDitherImage(new_image, threshold_map, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#orientation ⇒ Magick::OrientationType
Get the value of the Exif Orientation Tag.
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# File 'ext/RMagick/rmimage.c', line 9954
VALUE
Image_orientation(VALUE self)
{
Image *image = rm_check_destroyed(self);
return OrientationType_find(image->orientation);
}
|
#orientation=(orientation) ⇒ Magick::OrientationType
Set the orientation attribute.
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# File 'ext/RMagick/rmimage.c', line 9968
VALUE
Image_orientation_eq(VALUE self, VALUE orientation)
{
Image *image = rm_check_frozen(self);
VALUE_TO_ENUM(orientation, image->orientation, OrientationType);
return orientation;
}
|
#page ⇒ Magick::Rectang
The page attribute getter.
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# File 'ext/RMagick/rmimage.c', line 9982
VALUE
Image_page(VALUE self)
{
Image *image = rm_check_destroyed(self);
return Import_RectangleInfo(&image->page);
}
|
#page=(rect) ⇒ Magick::Rectang
The page attribute setter.
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# File 'ext/RMagick/rmimage.c', line 9996
VALUE
Image_page_eq(VALUE self, VALUE rect)
{
Image *image = rm_check_frozen(self);
Export_RectangleInfo(&image->page, rect);
return rect;
}
|
#paint_transparent(target, invert, fuzz, alpha: Magick::TransparentAlpha) ⇒ Magick::Image
Changes the opacity value of all the pixels that match color to the value specified by opacity. If invert is true, changes the pixels that don’t match color.
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# File 'ext/RMagick/rmimage.c', line 10019
VALUE
Image_paint_transparent(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
MagickPixel color;
Quantum alpha = TransparentAlpha;
double keep, fuzz;
MagickBooleanType okay, invert;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
// Default fuzz value is image's fuzz attribute.
fuzz = image->fuzz;
invert = MagickFalse;
switch (argc)
{
case 4:
if (TYPE(argv[argc - 1]) == T_HASH)
{
fuzz = NUM2DBL(argv[2]);
}
else
{
fuzz = NUM2DBL(argv[3]);
}
case 3:
if (TYPE(argv[argc - 1]) == T_HASH)
{
invert = RTEST(argv[1]);
}
else
{
invert = RTEST(argv[2]);
}
case 2:
alpha = get_named_alpha_value(argv[argc - 1]);
case 1:
Color_to_MagickPixel(image, &color, argv[0]);
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 to 4)", argc);
break;
}
new_image = rm_clone_image(image);
// Use fuzz value from caller
keep = new_image->fuzz;
new_image->fuzz = fuzz;
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
okay = TransparentPaintImage(new_image, (const MagickPixel *)&color, alpha, invert, exception);
new_image->fuzz = keep;
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
okay = TransparentPaintImage(new_image, (const MagickPixel *)&color, QuantumRange - alpha, invert);
new_image->fuzz = keep;
// Is it possible for TransparentPaintImage to silently fail?
rm_check_image_exception(new_image, DestroyOnError);
#endif
if (!okay)
{
// Force exception
DestroyImage(new_image);
rm_ensure_result(NULL);
}
return rm_image_new(new_image);
}
|
#palette? ⇒ Boolean
Return true if the image is PseudoClass and has 256 unique colors or less.
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# File 'ext/RMagick/rmimage.c', line 10103
VALUE
Image_palette_q(VALUE self)
{
#if defined(IMAGEMAGICK_7)
return has_image_attribute(self, IsPaletteImage);
#else
return has_attribute(self, IsPaletteImage);
#endif
}
|
#pixel_color(x, y) ⇒ Magick::Pixel #pixel_color(x, y, color) ⇒ Magick::Pixel
Get/set the color of the pixel at x, y.
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# File 'ext/RMagick/rmimage.c', line 10143
VALUE
Image_pixel_color(int argc, VALUE *argv, VALUE self)
{
Image *image;
Pixel new_color;
PixelPacket old_color;
ExceptionInfo *exception;
long x, y;
unsigned int set = False;
MagickBooleanType okay;
#if defined(IMAGEMAGICK_7)
Quantum *pixel;
const Quantum *old_pixel;
#else
PixelPacket *pixel;
const PixelPacket *old_pixel;
MagickPixel mpp;
IndexPacket *indexes;
#endif
memset(&old_color, 0, sizeof(old_color));
image = rm_check_destroyed(self);
switch (argc)
{
case 3:
rb_check_frozen(self);
set = True;
// Replace with new color? The arg can be either a color name or
// a Magick::Pixel.
Color_to_Pixel(&new_color, argv[2]);
case 2:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 or 3)", argc);
break;
}
x = NUM2LONG(argv[0]);
y = NUM2LONG(argv[1]);
// Get the color of a pixel
if (!set)
{
exception = AcquireExceptionInfo();
old_pixel = GetVirtualPixels(image, x, y, 1, 1, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#if defined(IMAGEMAGICK_7)
old_color.red = GetPixelRed(image, old_pixel);
old_color.green = GetPixelGreen(image, old_pixel);
old_color.blue = GetPixelBlue(image, old_pixel);
old_color.alpha = GetPixelAlpha(image, old_pixel);
old_color.black = GetPixelBlack(image, old_pixel);
return Pixel_from_PixelPacket(&old_color);
#else
old_color = *old_pixel;
indexes = GetAuthenticIndexQueue(image);
// PseudoClass
if (image->storage_class == PseudoClass)
{
old_color = image->colormap[(unsigned long)*indexes];
}
if (!image->matte)
{
old_color.opacity = OpaqueOpacity;
}
rm_init_magickpixel(image, &mpp);
mpp.red = GetPixelRed(&old_color);
mpp.green = GetPixelGreen(&old_color);
mpp.blue = GetPixelBlue(&old_color);
mpp.opacity = GetPixelOpacity(&old_color);
if (indexes)
{
mpp.index = GetPixelIndex(indexes);
}
return Pixel_from_MagickPixel(&mpp);
#endif
}
// ImageMagick segfaults if the pixel location is out of bounds.
// Do what IM does and return the background color.
if (x < 0 || y < 0 || (unsigned long)x >= image->columns || (unsigned long)y >= image->rows)
{
return Pixel_from_PixelColor(&image->background_color);
}
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
#endif
if (image->storage_class == PseudoClass)
{
#if defined(IMAGEMAGICK_7)
okay = SetImageStorageClass(image, DirectClass, exception);
CHECK_EXCEPTION();
if (!okay)
{
DestroyExceptionInfo(exception);
rb_raise(Class_ImageMagickError, "SetImageStorageClass failed. Can't set pixel color.");
}
#else
okay = SetImageStorageClass(image, DirectClass);
rm_check_image_exception(image, RetainOnError);
if (!okay)
{
rb_raise(Class_ImageMagickError, "SetImageStorageClass failed. Can't set pixel color.");
}
#endif
}
#if defined(IMAGEMAGICK_6)
exception = AcquireExceptionInfo();
#endif
pixel = GetAuthenticPixels(image, x, y, 1, 1, exception);
CHECK_EXCEPTION();
if (pixel)
{
#if defined(IMAGEMAGICK_7)
old_color.red = GetPixelRed(image, pixel);
old_color.green = GetPixelGreen(image, pixel);
old_color.blue = GetPixelBlue(image, pixel);
old_color.alpha = GetPixelAlpha(image, pixel);
old_color.black = GetPixelBlack(image, pixel);
SetPixelRed(image, new_color.red, pixel);
SetPixelGreen(image, new_color.green, pixel);
SetPixelBlue(image, new_color.blue, pixel);
SetPixelAlpha(image, new_color.alpha, pixel);
SetPixelBlack(image, new_color.black, pixel);
#else
old_color = *pixel;
indexes = GetAuthenticIndexQueue(image);
if (!image->matte)
{
old_color.opacity = OpaqueOpacity;
}
SetPixelRed(pixel, new_color.red);
SetPixelGreen(pixel, new_color.green);
SetPixelBlue(pixel, new_color.blue);
SetPixelOpacity(pixel, new_color.opacity);
if (indexes)
{
SetPixelIndex(indexes, new_color.black);
}
#endif
SyncAuthenticPixels(image, exception);
CHECK_EXCEPTION();
}
DestroyExceptionInfo(exception);
return Pixel_from_PixelPacket(&old_color);
}
|
#pixel_interpolation_method ⇒ Magick::PixelInterpolateMethod
Get the “interpolate” field.
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# File 'ext/RMagick/rmimage.c', line 10313
VALUE
Image_pixel_interpolation_method(VALUE self)
{
Image *image = rm_check_destroyed(self);
return PixelInterpolateMethod_find(image->interpolate);
}
|
#pixel_interpolation_method=(method) ⇒ Magick::PixelInterpolateMethod
Set the “interpolate” field.
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# File 'ext/RMagick/rmimage.c', line 10328
VALUE
Image_pixel_interpolation_method_eq(VALUE self, VALUE method)
{
Image *image = rm_check_frozen(self);
VALUE_TO_ENUM(method, image->interpolate, PixelInterpolateMethod);
return method;
}
|
#polaroid(angle = -5.0) ⇒ Magick::Image #polaroid(angle = -5.0) { ... } ⇒ Magick::Image
Produce an image that looks like a Polaroid instant picture. If the image has a “Caption” property, the value is used as a caption.
The following annotate attributes control the label rendering: align, decorate, density, encoding, fill, font, font_family, font_stretch, font_style, font_weight, gravity, pointsize, stroke, stroke_width, text_antialias, undercolor.
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# File 'ext/RMagick/rmimage.c', line 10360
VALUE
Image_polaroid(int argc, VALUE *argv, VALUE self)
{
Image *image, *clone, *new_image;
VALUE options;
double angle = -5.0;
Draw *draw;
ExceptionInfo *exception;
#if defined(IMAGEMAGICK_7)
const char *caption;
#endif
image = rm_check_destroyed(self);
switch (argc)
{
case 1:
angle = NUM2DBL(argv[0]);
case 0:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
break;
}
options = rm_polaroid_new();
Data_Get_Struct(options, Draw, draw);
clone = rm_clone_image(image);
clone->background_color = draw->shadow_color;
clone->border_color = draw->info->border_color;
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
caption = GetImageProperty(clone, "Caption", exception);
new_image = PolaroidImage(clone, draw->info, caption, angle, image->interpolate, exception);
#else
new_image = PolaroidImage(clone, draw->info, angle, exception);
#endif
rm_check_exception(exception, clone, DestroyOnError);
DestroyImage(clone);
DestroyExceptionInfo(exception);
RB_GC_GUARD(options);
return rm_image_new(new_image);
}
|
#posterize(levels = 4, dither = false) ⇒ Object
Reduces the image to a limited number of colors for a “poster” effect.
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# File 'ext/RMagick/rmimage.c', line 10418
VALUE
Image_posterize(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
MagickBooleanType dither = MagickFalse;
unsigned long levels = 4;
#if defined(IMAGEMAGICK_7)
DitherMethod dither_method;
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
switch (argc)
{
case 2:
dither = (MagickBooleanType) RTEST(argv[1]);
/* fall through */
case 1:
levels = NUM2ULONG(argv[0]);
/* fall through */
case 0:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 2)", argc);
}
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
dither_method = dither ? RiemersmaDitherMethod : NoDitherMethod;
PosterizeImage(new_image, levels, dither_method, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
PosterizeImage(new_image, levels, dither);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#preview(preview) ⇒ Magick::Image
Creates an image that contains 9 small versions of the receiver image. The center image is the unchanged receiver. The other 8 images are variations created by transforming the receiver according to the specified preview type with varying parameters.
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# File 'ext/RMagick/rmimage.c', line 10468
VALUE
Image_preview(VALUE self, VALUE preview)
{
Image *image, *new_image;
PreviewType preview_type;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
VALUE_TO_ENUM(preview, preview_type, PreviewType);
exception = AcquireExceptionInfo();
new_image = PreviewImage(image, preview_type, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#profile!(name, profile) ⇒ Magick::Image
Set the image profile. If “profile” is nil, deletes the profile. Otherwise “profile” must be a string containing the specified profile.
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# File 'ext/RMagick/rmimage.c', line 10496
VALUE
Image_profile_bang(VALUE self, VALUE name, VALUE profile)
{
if (profile == Qnil)
{
return Image_delete_profile(self, name);
}
else
{
return set_profile(self, StringValueCStr(name), profile);
}
}
|
#properties ⇒ Hash #properties { ... } ⇒ Magick::Image
If called with an associated block, properties runs the block once for each property defined for the image. The block arguments are the property name and its value. If there is no block, properties returns a hash with one element for each property. The hash key is the property name and the associated value is the property value.
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# File 'ext/RMagick/rmimage.c', line 12319
VALUE
Image_properties(VALUE self)
{
Image *image;
VALUE attr_hash, ary;
const char *property, *value;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
#endif
if (rb_block_given_p())
{
ary = rb_ary_new2(2);
ResetImagePropertyIterator(image);
property = GetNextImageProperty(image);
while (property)
{
#if defined(IMAGEMAGICK_7)
value = GetImageProperty(image, property, exception);
#else
value = GetImageProperty(image, property);
#endif
rb_ary_store(ary, 0, rb_str_new2(property));
rb_ary_store(ary, 1, rb_str_new2(value));
rb_yield(ary);
property = GetNextImageProperty(image);
}
#if defined(IMAGEMAGICK_7)
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
rm_check_image_exception(image, RetainOnError);
#endif
RB_GC_GUARD(ary);
return self;
}
// otherwise return properties hash
else
{
attr_hash = rb_hash_new();
ResetImagePropertyIterator(image);
property = GetNextImageProperty(image);
while (property)
{
#if defined(IMAGEMAGICK_7)
value = GetImageProperty(image, property, exception);
#else
value = GetImageProperty(image, property);
#endif
rb_hash_aset(attr_hash, rb_str_new2(property), rb_str_new2(value));
property = GetNextImageProperty(image);
}
#if defined(IMAGEMAGICK_7)
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
rm_check_image_exception(image, RetainOnError);
#endif
RB_GC_GUARD(attr_hash);
return attr_hash;
}
}
|
#quality ⇒ Numeric
Get image quality.
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# File 'ext/RMagick/rmimage.c', line 10517
VALUE
Image_quality(VALUE self)
{
IMPLEMENT_ATTR_READER(Image, quality, ulong);
}
|
#quantize(number_colors = 256, colorspace = Magick::RGBColorspace, dither = true, tree_depth = 0, measure_error = false) ⇒ Magick::Image
Analyzes the colors within a reference image and chooses a fixed number of colors to represent the image. The goal of the algorithm is to minimize the difference between the input and output image while minimizing the processing time.
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# File 'ext/RMagick/rmimage.c', line 10737
VALUE
Image_quantize(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
QuantizeInfo quantize_info;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
GetQuantizeInfo(&quantize_info);
switch (argc)
{
case 5:
quantize_info.measure_error = (MagickBooleanType) RTEST(argv[4]);
case 4:
quantize_info.tree_depth = NUM2UINT(argv[3]);
case 3:
if (rb_obj_is_kind_of(argv[2], Class_DitherMethod))
{
VALUE_TO_ENUM(argv[2], quantize_info.dither_method, DitherMethod);
#if defined(IMAGEMAGICK_6)
quantize_info.dither = quantize_info.dither_method != NoDitherMethod;
#endif
}
else
{
#if defined(IMAGEMAGICK_7)
quantize_info.dither_method = RTEST(argv[2]) ? RiemersmaDitherMethod : NoDitherMethod;
#else
quantize_info.dither = (MagickBooleanType) RTEST(argv[2]);
#endif
}
case 2:
VALUE_TO_ENUM(argv[1], quantize_info.colorspace, ColorspaceType);
case 1:
quantize_info.number_colors = NUM2UINT(argv[0]);
case 0:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 5)", argc);
break;
}
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
QuantizeImage(&quantize_info, new_image, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
QuantizeImage(&quantize_info, new_image);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#quantum_depth ⇒ Numeric
Return the image depth to the nearest Quantum (8, 16, or 32).
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# File 'ext/RMagick/rmimage.c', line 10529
VALUE
Image_quantum_depth(VALUE self)
{
Image *image;
unsigned long quantum_depth;
image = rm_check_destroyed(self);
quantum_depth = GetImageQuantumDepth(image, MagickFalse);
return ULONG2NUM(quantum_depth);
}
|
#quantum_operator(operator, rvalue, channel = Magick::AllChannels) ⇒ Magick::Image #quantum_operator(operator, rvalue, *channels) ⇒ Magick::Image
Performs the requested integer arithmetic operation on the selected channel of the image. This method allows simple arithmetic operations on the component values of all pixels in an image. Of course, you could also do this in Ruby using get_pixels and store_pixels, or view, but quantum_operator will be faster, especially for large numbers of pixels, since it does not need to convert the pixels from C to Ruby.
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# File 'ext/RMagick/rmimage.c', line 10562
VALUE
Image_quantum_operator(int argc, VALUE *argv, VALUE self)
{
Image *image;
QuantumExpressionOperator operator;
MagickEvaluateOperator qop;
double rvalue;
ChannelType channel;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
// The default channel is AllChannels
channel = AllChannels;
/*
If there are 3 arguments, argument 2 is a ChannelType argument.
Arguments 1 and 0 are required and are the rvalue and operator,
respectively.
*/
switch (argc)
{
case 3:
VALUE_TO_ENUM(argv[2], channel, ChannelType);
/* Fall through */
case 2:
rvalue = NUM2DBL(argv[1]);
VALUE_TO_ENUM(argv[0], operator, QuantumExpressionOperator);
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 or 3)", argc);
break;
}
// Map QuantumExpressionOperator to MagickEvaluateOperator
switch (operator)
{
default:
case UndefinedQuantumOperator:
qop = UndefinedEvaluateOperator;
break;
case AddQuantumOperator:
qop = AddEvaluateOperator;
break;
case AndQuantumOperator:
qop = AndEvaluateOperator;
break;
case DivideQuantumOperator:
qop = DivideEvaluateOperator;
break;
case LShiftQuantumOperator:
qop = LeftShiftEvaluateOperator;
break;
case MaxQuantumOperator:
qop = MaxEvaluateOperator;
break;
case MinQuantumOperator:
qop = MinEvaluateOperator;
break;
case MultiplyQuantumOperator:
qop = MultiplyEvaluateOperator;
break;
case OrQuantumOperator:
qop = OrEvaluateOperator;
break;
case RShiftQuantumOperator:
qop = RightShiftEvaluateOperator;
break;
case SubtractQuantumOperator:
qop = SubtractEvaluateOperator;
break;
case XorQuantumOperator:
qop = XorEvaluateOperator;
break;
case PowQuantumOperator:
qop = PowEvaluateOperator;
break;
case LogQuantumOperator:
qop = LogEvaluateOperator;
break;
case ThresholdQuantumOperator:
qop = ThresholdEvaluateOperator;
break;
case ThresholdBlackQuantumOperator:
qop = ThresholdBlackEvaluateOperator;
break;
case ThresholdWhiteQuantumOperator:
qop = ThresholdWhiteEvaluateOperator;
break;
case GaussianNoiseQuantumOperator:
qop = GaussianNoiseEvaluateOperator;
break;
case ImpulseNoiseQuantumOperator:
qop = ImpulseNoiseEvaluateOperator;
break;
case LaplacianNoiseQuantumOperator:
qop = LaplacianNoiseEvaluateOperator;
break;
case MultiplicativeNoiseQuantumOperator:
qop = MultiplicativeNoiseEvaluateOperator;
break;
case PoissonNoiseQuantumOperator:
qop = PoissonNoiseEvaluateOperator;
break;
case UniformNoiseQuantumOperator:
qop = UniformNoiseEvaluateOperator;
break;
case CosineQuantumOperator:
qop = CosineEvaluateOperator;
break;
case SetQuantumOperator:
qop = SetEvaluateOperator;
break;
case SineQuantumOperator:
qop = SineEvaluateOperator;
break;
case AddModulusQuantumOperator:
qop = AddModulusEvaluateOperator;
break;
case MeanQuantumOperator:
qop = MeanEvaluateOperator;
break;
case AbsQuantumOperator:
qop = AbsEvaluateOperator;
break;
case ExponentialQuantumOperator:
qop = ExponentialEvaluateOperator;
break;
case MedianQuantumOperator:
qop = MedianEvaluateOperator;
break;
case SumQuantumOperator:
qop = SumEvaluateOperator;
break;
#if defined(IMAGEMAGICK_GREATER_THAN_EQUAL_6_8_9)
case RootMeanSquareQuantumOperator:
qop = RootMeanSquareEvaluateOperator;
break;
#endif
}
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
BEGIN_CHANNEL_MASK(image, channel);
EvaluateImage(image, qop, rvalue, exception);
END_CHANNEL_MASK(image);
#else
EvaluateImageChannel(image, channel, qop, rvalue, exception);
#endif
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
return self;
}
|
#radial_blur(angle_obj) ⇒ Magick::Image
Applies a radial blur to the image.
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# File 'ext/RMagick/rmimage.c', line 10804
VALUE
Image_radial_blur(VALUE self, VALUE angle_obj)
{
Image *image, *new_image;
ExceptionInfo *exception;
double angle = NUM2DBL(angle_obj);
image = rm_check_destroyed(self);
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_GREATER_THAN_EQUAL_6_8_9)
new_image = RotationalBlurImage(image, angle, exception);
#else
new_image = RadialBlurImage(image, angle, exception);
#endif
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#radial_blur_channel(angle, channel = Magick::AllChannels) ⇒ Magick::Image #radial_blur_channel(angle, *channels) ⇒ Magick::Image
Applies a radial blur to the selected image channels.
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# File 'ext/RMagick/rmimage.c', line 10839
VALUE
Image_radial_blur_channel(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
ExceptionInfo *exception;
ChannelType channels;
double angle;
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
// There must be 1 remaining argument.
if (argc == 0)
{
rb_raise(rb_eArgError, "wrong number of arguments (0 for 1 or more)");
}
else if (argc > 1)
{
raise_ChannelType_error(argv[argc-1]);
}
angle = NUM2DBL(argv[0]);
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
BEGIN_CHANNEL_MASK(image, channels);
new_image = RotationalBlurImage(image, angle, exception);
CHANGE_RESULT_CHANNEL_MASK(new_image);
END_CHANNEL_MASK(image);
#elif defined(IMAGEMAGICK_GREATER_THAN_EQUAL_6_8_9)
new_image = RotationalBlurImageChannel(image, channels, angle, exception);
#else
new_image = RadialBlurImageChannel(image, channels, angle, exception);
#endif
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#raise(width = 6, height = 6, raised = true) ⇒ Magick::Image
Create a simulated three-dimensional button-like effect by lightening and darkening the edges of the image. The “width” and “height” arguments define the width of the vertical and horizontal edge of the effect. If “raised” is true, creates a raised effect, otherwise a lowered effect.
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# File 'ext/RMagick/rmimage.c', line 10959
VALUE
Image_raise(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
RectangleInfo rect;
int raised = MagickTrue; // default
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
memset(&rect, 0, sizeof(rect));
rect.width = 6; // default
rect.height = 6; // default
image = rm_check_destroyed(self);
switch (argc)
{
case 3:
raised = RTEST(argv[2]);
case 2:
rect.height = NUM2ULONG(argv[1]);
case 1:
rect.width = NUM2ULONG(argv[0]);
case 0:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 3)", argc);
break;
}
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
RaiseImage(new_image, &rect, raised, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
RaiseImage(new_image, &rect, raised);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#random_threshold_channel(geometry_str, channel = Magick::AllChannels) ⇒ Magick::Image #random_threshold_channel(geometry_str, *channels) ⇒ Magick::Image
Changes the value of individual pixels based on the intensity of each pixel compared to a random threshold. The result is a low-contrast, two color image.
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# File 'ext/RMagick/rmimage.c', line 10895
VALUE
Image_random_threshold_channel(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
ChannelType channels;
char *thresholds;
VALUE geom_str;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
// There must be 1 remaining argument.
if (argc == 0)
{
rb_raise(rb_eArgError, "missing threshold argument");
}
else if (argc > 1)
{
raise_ChannelType_error(argv[argc-1]);
}
// Accept any argument that has a to_s method.
geom_str = rb_String(argv[0]);
thresholds = StringValueCStr(geom_str);
new_image = rm_clone_image(image);
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
BEGIN_CHANNEL_MASK(new_image, channels);
{
GeometryInfo geometry_info;
ParseGeometry(thresholds, &geometry_info);
RandomThresholdImage(new_image, geometry_info.rho, geometry_info.sigma, exception);
}
END_CHANNEL_MASK(new_image);
#else
RandomThresholdImageChannel(new_image, channels, thresholds, exception);
#endif
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
RB_GC_GUARD(geom_str);
return rm_image_new(new_image);
}
|
#recolor(color_matrix) ⇒ Magick::Image
Use this method to translate, scale, shear, or rotate image colors. Although you can use variable sized matrices, typically you use a 5x5 for an RGBA image and a 6x6 for CMYKA. Populate the last row with normalized values to translate.
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# File 'ext/RMagick/rmimage.c', line 11128
VALUE
Image_recolor(VALUE self, VALUE color_matrix)
{
Image *image, *new_image;
unsigned long order;
long x, len;
double *matrix;
ExceptionInfo *exception;
KernelInfo *kernel_info;
image = rm_check_destroyed(self);
color_matrix = rm_check_ary_type(color_matrix);
// Allocate color matrix from Ruby's memory
len = RARRAY_LEN(color_matrix);
matrix = ALLOC_N(double, len);
for (x = 0; x < len; x++)
{
VALUE element = rb_ary_entry(color_matrix, x);
if (rm_check_num2dbl(element))
{
matrix[x] = NUM2DBL(element);
}
else
{
xfree(matrix);
rb_raise(rb_eTypeError, "type mismatch: %s given", rb_class2name(CLASS_OF(element)));
}
}
order = (unsigned long)sqrt((double)(len + 1.0));
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
kernel_info = AcquireKernelInfo(NULL, exception);
if (rm_should_raise_exception(exception, RetainExceptionRetention))
{
if (kernel_info != (KernelInfo *) NULL)
{
DestroyKernelInfo(kernel_info);
}
xfree((void *)matrix);
rm_raise_exception(exception);
}
#else
kernel_info = AcquireKernelInfo(NULL);
#endif
if (kernel_info == (KernelInfo *) NULL)
{
xfree((void *) matrix);
DestroyExceptionInfo(exception);
return Qnil;
}
kernel_info->width = order;
kernel_info->height = order;
kernel_info->values = (double *) matrix;
new_image = ColorMatrixImage(image, kernel_info, exception);
kernel_info->values = (double *) NULL;
DestroyKernelInfo(kernel_info);
xfree((void *) matrix);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#reduce_noise(radius) ⇒ Magick::Image
Smooth the contours of an image while still preserving edge information.
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# File 'ext/RMagick/rmimage.c', line 11298
VALUE
Image_reduce_noise(VALUE self, VALUE radius)
{
Image *image, *new_image;
ExceptionInfo *exception;
size_t radius_size = NUM2SIZET(radius);
image = rm_check_destroyed(self);
exception = AcquireExceptionInfo();
new_image = StatisticImage(image, NonpeakStatistic, radius_size, radius_size, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#remap(remap_image, dither_method = Magick::RiemersmaDitherMethod) ⇒ Object Also known as: affinity
Reduce the number of colors in img to the colors used by remap_image. If a dither method is specified then the given colors are dithered over the image as necessary, otherwise the closest color (in RGB colorspace) is selected to replace that pixel in the image.
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# File 'ext/RMagick/rmimage.c', line 11328
VALUE
Image_remap(int argc, VALUE *argv, VALUE self)
{
Image *image, *remap_image;
QuantizeInfo quantize_info;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_frozen(self);
GetQuantizeInfo(&quantize_info);
switch (argc)
{
case 2:
VALUE_TO_ENUM(argv[1], quantize_info.dither_method, DitherMethod);
#if defined(IMAGEMAGICK_6)
quantize_info.dither = MagickTrue;
#endif
break;
case 1:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 or 2)", argc);
break;
}
remap_image = rm_check_destroyed(rm_cur_image(argv[0]));
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
RemapImage(&quantize_info, image, remap_image, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
RemapImage(&quantize_info, image, remap_image);
rm_check_image_exception(image, RetainOnError);
#endif
return self;
}
|
#rendering_intent ⇒ Magick::RenderingIntent
Get the type of rendering intent.
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# File 'ext/RMagick/rmimage.c', line 11377
VALUE
Image_rendering_intent(VALUE self)
{
Image *image = rm_check_destroyed(self);
return RenderingIntent_find(image->rendering_intent);
}
|
#rendering_intent=(ri) ⇒ Magick::RenderingIntent
Set the type of rendering intent..
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# File 'ext/RMagick/rmimage.c', line 11391
VALUE
Image_rendering_intent_eq(VALUE self, VALUE ri)
{
Image *image = rm_check_frozen(self);
VALUE_TO_ENUM(ri, image->rendering_intent, RenderingIntent);
return ri;
}
|
#resample(x_resolution = 72.0, y_resolution = 72.0, filter = self.filter, blur = self.blur) ⇒ Magick
Resample image to specified horizontal resolution, vertical resolution, filter and blur factor.
Resize the image so that its rendered size remains the same as the original at the specified target resolution. For example, if a 300 DPI image renders at 3 inches by 2 inches on a 300 DPI device, when the image has been resampled to 72 DPI, it will render at 3 inches by 2 inches on a 72 DPI device. Note that only a small number of image formats (e.g. JPEG, PNG, and TIFF) are capable of storing the image resolution. For formats which do not support an image resolution, the original resolution of the image must be specified via the density attribute prior to specifying the resample resolution.
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# File 'ext/RMagick/rmimage.c', line 11554
VALUE
Image_resample(int argc, VALUE *argv, VALUE self)
{
rm_check_destroyed(self);
return resample(False, argc, argv, self);
}
|
#resample!(x_resolution = 72.0, y_resolution = 72.0, filter = self.filter, blur = self.blur) ⇒ Magick
Resample image to specified horizontal resolution, vertical resolution, filter and blur factor. In-place form of #resample.
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# File 'ext/RMagick/rmimage.c', line 11574
VALUE
Image_resample_bang(int argc, VALUE *argv, VALUE self)
{
rm_check_frozen(self);
return resample(True, argc, argv, self);
}
|
#resize(scale) ⇒ Magick::Image #resize(cols, rows, filter, blur) ⇒ Magick::Image
Scale an image to the desired dimensions using the specified filter and blur factor.
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# File 'ext/RMagick/rmimage.c', line 11692
VALUE
Image_resize(int argc, VALUE *argv, VALUE self)
{
rm_check_destroyed(self);
return resize(False, argc, argv, self);
}
|
#resize!(scale) ⇒ Magick::Image #resize!(cols, rows, filter, blur) ⇒ Magick::Image
Scale an image to the desired dimensions using the specified filter and blur factor. In-place form of #resize.
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# File 'ext/RMagick/rmimage.c', line 11718
VALUE
Image_resize_bang(int argc, VALUE *argv, VALUE self)
{
rm_check_frozen(self);
return resize(True, argc, argv, self);
}
|
#resize_to_fill(ncols, nrows = nil, gravity = CenterGravity) ⇒ Object Also known as: crop_resized
Force an image to exact dimensions without changing the aspect ratio. Resize and crop if necessary. (Thanks to Jerett Taylor!)
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# File 'lib/rmagick_internal.rb', line 1015 def resize_to_fill(ncols, nrows = nil, gravity = CenterGravity) copy.resize_to_fill!(ncols, nrows, gravity) end |
#resize_to_fill!(ncols, nrows = nil, gravity = CenterGravity) ⇒ Object Also known as: crop_resized!
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# File 'lib/rmagick_internal.rb', line 1019 def resize_to_fill!(ncols, nrows = nil, gravity = CenterGravity) nrows ||= ncols if ncols != columns || nrows != rows scale = [ncols / columns.to_f, nrows / rows.to_f].max resize!(scale * columns + 0.5, scale * rows + 0.5) end crop!(gravity, ncols, nrows, true) if ncols != columns || nrows != rows self end |
#resize_to_fit(cols, rows = nil) ⇒ Object
Convenience method to resize retaining the aspect ratio. (Thanks to Robert Manni!)
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# File 'lib/rmagick_internal.rb', line 1035 def resize_to_fit(cols, rows = nil) rows ||= cols change_geometry(Geometry.new(cols, rows)) do |ncols, nrows| resize(ncols, nrows) end end |
#resize_to_fit!(cols, rows = nil) ⇒ Object
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# File 'lib/rmagick_internal.rb', line 1042 def resize_to_fit!(cols, rows = nil) rows ||= cols change_geometry(Geometry.new(cols, rows)) do |ncols, nrows| resize!(ncols, nrows) end end |
#roll(x_offset, y_offset) ⇒ Magick::Image
Offset an image as defined by x_offset and y_offset.
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# File 'ext/RMagick/rmimage.c', line 11733
VALUE
Image_roll(VALUE self, VALUE x_offset, VALUE y_offset)
{
Image *image, *new_image;
ExceptionInfo *exception;
ssize_t x = NUM2LONG(x_offset);
ssize_t y = NUM2LONG(y_offset);
image = rm_check_destroyed(self);
exception = AcquireExceptionInfo();
new_image = RollImage(image, x, y, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#rotate(degrees) ⇒ Magick::Image #rotate(degrees, qualifier) ⇒ Magick::Image
Rotate the receiver by the specified angle. Positive angles rotate clockwise while negative angles rotate counter-clockwise. New pixels introduced by the rotation are the same color as the current background color. Set the background color to “none” to make the new pixels transparent black.
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# File 'ext/RMagick/rmimage.c', line 11835
VALUE
Image_rotate(int argc, VALUE *argv, VALUE self)
{
rm_check_destroyed(self);
return rotate(False, argc, argv, self);
}
|
#rotate!(degrees) ⇒ Magick::Image #rotate!(degrees, qualifier) ⇒ Magick::Image
Rotate the image. In-place form of #rotate.
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# File 'ext/RMagick/rmimage.c', line 11859
VALUE
Image_rotate_bang(int argc, VALUE *argv, VALUE self)
{
rm_check_frozen(self);
return rotate(True, argc, argv, self);
}
|
#rows ⇒ Numeric
Return image rows.
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# File 'ext/RMagick/rmimage.c', line 11872
VALUE
Image_rows(VALUE self)
{
IMPLEMENT_ATTR_READER(Image, rows, int);
}
|
#sample(scale) ⇒ Magick::Image #sample(cols, rows) ⇒ Magick::Image
Scale an image to the desired dimensions with pixel sampling. Unlike other scaling methods, this method does not introduce any additional color into the scaled image.
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# File 'ext/RMagick/rmimage.c', line 11895
VALUE
Image_sample(int argc, VALUE *argv, VALUE self)
{
rm_check_destroyed(self);
return scale(False, argc, argv, self, SampleImage);
}
|
#sample!(scale) ⇒ Magick::Image #sample!(cols, rows) ⇒ Magick::Image
Scale an image to the desired dimensions with pixel sampling. In-place form of #sample.
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# File 'ext/RMagick/rmimage.c', line 11919
VALUE
Image_sample_bang(int argc, VALUE *argv, VALUE self)
{
rm_check_frozen(self);
return scale(True, argc, argv, self, SampleImage);
}
|
#scale(scale) ⇒ Magick::Image #scale(cols, rows) ⇒ Magick::Image
Change the size of an image to the given dimensions. Alias of #sample.
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# File 'ext/RMagick/rmimage.c', line 11943
VALUE
Image_scale(int argc, VALUE *argv, VALUE self)
{
rm_check_destroyed(self);
return scale(False, argc, argv, self, ScaleImage);
}
|
#scale!(scale) ⇒ Magick::Image #scale!(cols, rows) ⇒ Magick::Image
Change the size of an image to the given dimensions. Alias of #sample!.
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# File 'ext/RMagick/rmimage.c', line 11967
VALUE
Image_scale_bang(int argc, VALUE *argv, VALUE self)
{
rm_check_frozen(self);
return scale(True, argc, argv, self, ScaleImage);
}
|
#scene ⇒ Numeric
Return the scene number assigned to the image the last time the image was written to a multi-image image file.
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# File 'ext/RMagick/rmimage.c', line 12058
VALUE
Image_scene(VALUE self)
{
IMPLEMENT_ATTR_READER(Image, scene, ulong);
}
|
#segment(colorspace = Magick::RGBColorspace, cluster_threshold = 1.0, smoothing_threshold = 1.5, verbose = false) ⇒ Magick::Image
Segments an image by analyzing the histograms of the color components and identifying units that are homogeneous with the fuzzy c-means technique.
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# File 'ext/RMagick/rmimage.c', line 12260
VALUE
Image_segment(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
int colorspace = RGBColorspace; // These are the Magick++ defaults
unsigned int verbose = MagickFalse;
double cluster_threshold = 1.0;
double smoothing_threshold = 1.5;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
switch (argc)
{
case 4:
verbose = RTEST(argv[3]);
case 3:
smoothing_threshold = NUM2DBL(argv[2]);
case 2:
cluster_threshold = NUM2DBL(argv[1]);
case 1:
VALUE_TO_ENUM(argv[0], colorspace, ColorspaceType);
case 0:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 4)", argc);
break;
}
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
SegmentImage(new_image, colorspace, verbose, cluster_threshold, smoothing_threshold, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
SegmentImage(new_image, colorspace, verbose, cluster_threshold, smoothing_threshold);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#selective_blur_channel(radius, sigma, threshold, channel = Magick::AllChannels) ⇒ Magick::Image #selective_blur_channel(radius, sigma, threshold, *channels) ⇒ Magick::Image
Selectively blur pixels within a contrast threshold.
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# File 'ext/RMagick/rmimage.c', line 12084
VALUE
Image_selective_blur_channel(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
double radius, sigma, threshold;
ExceptionInfo *exception;
ChannelType channels;
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
if (argc > 3)
{
raise_ChannelType_error(argv[argc-1]);
}
if (argc != 3)
{
rb_raise(rb_eArgError, "wrong number of arguments (%d for 3 or more)", argc);
}
radius = NUM2DBL(argv[0]);
sigma = NUM2DBL(argv[1]);
// threshold is either a floating-point number or a string in the form "NN%".
// Either way it's supposed to represent a percentage of the QuantumRange.
threshold = rm_percentage(argv[2], 1.0) * QuantumRange;
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
BEGIN_CHANNEL_MASK(image, channels);
new_image = SelectiveBlurImage(image, radius, sigma, threshold, exception);
CHANGE_RESULT_CHANNEL_MASK(new_image);
END_CHANNEL_MASK(image);
#else
new_image = SelectiveBlurImageChannel(image, channels, radius, sigma, threshold, exception);
#endif
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#separate(channel = Magick::AllChannels) ⇒ Magick::ImageList #separate(*channels) ⇒ Magick::ImageList
Constructs a grayscale image for each channel specified.
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# File 'ext/RMagick/rmimage.c', line 12174
VALUE
Image_separate(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_images;
ChannelType channels = 0;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
// All arguments are ChannelType enums
if (argc > 0)
{
raise_ChannelType_error(argv[argc-1]);
}
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
BEGIN_CHANNEL_MASK(image, channels);
new_images = SeparateImages(image, exception);
CHANGE_RESULT_CHANNEL_MASK(new_images);
END_CHANNEL_MASK(image);
#else
new_images = SeparateImages(image, channels, exception);
#endif
rm_check_exception(exception, new_images, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_imagelist_from_images(new_images);
}
|
#sepiatone(threshold = Magick::QuantumRange) ⇒ Magick::Image
Applies a special effect to the image, similar to the effect achieved in a photo darkroom by sepia toning.
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# File 'ext/RMagick/rmimage.c', line 12215
VALUE
Image_sepiatone(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
double threshold = (double) QuantumRange;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
switch (argc)
{
case 1:
threshold = NUM2DBL(argv[0]);
break;
case 0:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
}
exception = AcquireExceptionInfo();
new_image = SepiaToneImage(image, threshold, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#set_channel_depth(channel_arg, depth) ⇒ Object
Sets the depth of the image channel.
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# File 'ext/RMagick/rmimage.c', line 12132
VALUE
Image_set_channel_depth(VALUE self, VALUE channel_arg, VALUE depth)
{
Image *image;
ChannelType channel;
unsigned long channel_depth;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_frozen(self);
VALUE_TO_ENUM(channel_arg, channel, ChannelType);
channel_depth = NUM2ULONG(depth);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
BEGIN_CHANNEL_MASK(image, channel);
SetImageDepth(image, channel_depth, exception);
END_CHANNEL_MASK(image);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
SetImageChannelDepth(image, channel, channel_depth);
rm_check_image_exception(image, RetainOnError);
#endif
return self;
}
|
#shade(shading = false, azimuth = 30.0, elevation = 30.0) ⇒ Magick::Image
Shine a distant light on an image to create a three-dimensional effect. You control the positioning of the light with azimuth and elevation; azimuth is measured in degrees off the x axis and elevation is measured in pixels above the Z axis.
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# File 'ext/RMagick/rmimage.c', line 12409
VALUE
Image_shade(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
double azimuth = 30.0, elevation = 30.0;
unsigned int shading = MagickFalse;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
switch (argc)
{
case 3:
elevation = NUM2DBL(argv[2]);
case 2:
azimuth = NUM2DBL(argv[1]);
case 1:
shading = RTEST(argv[0]);
case 0:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 3)", argc);
break;
}
exception = AcquireExceptionInfo();
new_image = ShadeImage(image, shading, azimuth, elevation, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#Image ⇒ Magick::Image
Call ShadowImage. X- and y-offsets are the pixel offset. Alpha is either a number between 0 and 1 or a string “NN%”. Sigma is the std. dev. of the Gaussian, in pixels.
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# File 'ext/RMagick/rmimage.c', line 12456
VALUE
Image_shadow(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
double alpha = 100.0;
double sigma = 4.0;
long x_offset = 4L;
long y_offset = 4L;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
switch (argc)
{
case 4:
alpha = rm_percentage(argv[3], 1.0); // Clamp to 1.0 < x <= 100.0
if (fabs(alpha) < 0.01)
{
rb_warning("shadow will be transparent - alpha %g very small", alpha);
}
alpha = FMIN(alpha, 1.0);
alpha = FMAX(alpha, 0.01);
alpha *= 100.0;
case 3:
sigma = NUM2DBL(argv[2]);
case 2:
y_offset = NUM2LONG(argv[1]);
case 1:
x_offset = NUM2LONG(argv[0]);
case 0:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 4)", argc);
break;
}
exception = AcquireExceptionInfo();
new_image = ShadowImage(image, alpha, sigma, x_offset, y_offset, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#sharpen(radius = 0.0, sigma = 1.0) ⇒ Magick::Image
Sharpen an image.
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# File 'ext/RMagick/rmimage.c', line 12508
VALUE
Image_sharpen(int argc, VALUE *argv, VALUE self)
{
return effect_image(self, argc, argv, SharpenImage);
}
|
#sharpen_channel(radius = 0.0, sigma = 1.0, channel = Magick::AllChannels) ⇒ Magick::Image #sharpen_channel(radius = 0.0, sigma = 1.0, *channels) ⇒ Magick::Image
Sharpen image on a channel.
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# File 'ext/RMagick/rmimage.c', line 12530
VALUE
Image_sharpen_channel(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
ChannelType channels;
ExceptionInfo *exception;
double radius = 0.0, sigma = 1.0;
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
// There must be 0, 1, or 2 remaining arguments.
switch (argc)
{
case 2:
sigma = NUM2DBL(argv[1]);
/* Fall thru */
case 1:
radius = NUM2DBL(argv[0]);
/* Fall thru */
case 0:
break;
default:
raise_ChannelType_error(argv[argc-1]);
}
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
BEGIN_CHANNEL_MASK(image, channels);
new_image = SharpenImage(image, radius, sigma, exception);
CHANGE_RESULT_CHANNEL_MASK(new_image);
END_CHANNEL_MASK(image);
#else
new_image = SharpenImageChannel(image, channels, radius, sigma, exception);
#endif
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#shave(width, height) ⇒ Magick::Image
Shave pixels from the image edges, leaving a rectangle of the specified width & height in the center.
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# File 'ext/RMagick/rmimage.c', line 12582
VALUE
Image_shave(VALUE self, VALUE width, VALUE height)
{
rm_check_destroyed(self);
return xform_image(False, self, INT2FIX(0), INT2FIX(0), width, height, ShaveImage);
}
|
#shave!(width, height) ⇒ Magick::Image
Shave pixels from the image edges, leaving a rectangle of the specified width & height in the center. In-place form of #shave.
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# File 'ext/RMagick/rmimage.c', line 12600
VALUE
Image_shave_bang(VALUE self, VALUE width, VALUE height)
{
rm_check_frozen(self);
return xform_image(True, self, INT2FIX(0), INT2FIX(0), width, height, ShaveImage);
}
|
#shear(x_shear, y_shear) ⇒ Magick::Image
Shearing slides one edge of an image along the X or Y axis, creating a parallelogram. An X direction shear slides an edge along the X axis, while a Y direction shear slides an edge along the Y axis. The amount of the shear is controlled by a shear angle. For X direction shears, x_shear is measured relative to the Y axis, and similarly, for Y direction shears y_shear is measured relative to the X axis. Empty triangles left over from shearing the image are filled with the background color.
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# File 'ext/RMagick/rmimage.c', line 12620
VALUE
Image_shear(VALUE self, VALUE x_shear, VALUE y_shear)
{
Image *image, *new_image;
ExceptionInfo *exception;
double x = NUM2DBL(x_shear);
double y = NUM2DBL(y_shear);
image = rm_check_destroyed(self);
exception = AcquireExceptionInfo();
new_image = ShearImage(image, x, y, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#sigmoidal_contrast_channel(contrast = 3.0, midpoint = 50.0, sharpen = false, channel = Magick::AllChannels) ⇒ Magick::Image #sigmoidal_contrast_channel(contrast = 3.0, midpoint = 50.0, sharpen = false, *channels) ⇒ Magick::Image
Adjusts the contrast of an image channel with a non-linear sigmoidal contrast algorithm. Increases the contrast of the image using a sigmoidal transfer function without saturating highlights or shadows.
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# File 'ext/RMagick/rmimage.c', line 12667
VALUE
Image_sigmoidal_contrast_channel(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
MagickBooleanType sharpen = MagickFalse;
double contrast = 3.0;
double midpoint = 50.0;
ChannelType channels;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
switch (argc)
{
case 3:
sharpen = (MagickBooleanType) RTEST(argv[2]);
case 2:
midpoint = NUM2DBL(argv[1]);
case 1:
contrast = NUM2DBL(argv[0]);
case 0:
break;
default:
raise_ChannelType_error(argv[argc-1]);
break;
}
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
BEGIN_CHANNEL_MASK(new_image, channels);
SigmoidalContrastImage(new_image, sharpen, contrast, midpoint, exception);
END_CHANNEL_MASK(new_image);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
SigmoidalContrastImageChannel(new_image, channels, sharpen, contrast, midpoint);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#signature ⇒ String?
Compute a message digest from an image pixel stream with an implementation of the NIST SHA-256 Message Digest algorithm.
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# File 'ext/RMagick/rmimage.c', line 12721
VALUE
Image_signature(VALUE self)
{
Image *image;
const char *signature;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
SignatureImage(image, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
SignatureImage(image);
rm_check_image_exception(image, RetainOnError);
#endif
signature = rm_get_property(image, "signature");
if (!signature)
{
return Qnil;
}
return rb_str_new(signature, 64);
}
|
#sketch(radius = 0.0, sigma = 1.0, angle = 0.0) ⇒ Magick::Image
Simulates a pencil sketch. For best results start with a grayscale image.
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# File 'ext/RMagick/rmimage.c', line 12760
VALUE
Image_sketch(int argc, VALUE *argv, VALUE self)
{
rm_check_destroyed(self);
return motion_blur(argc, argv, self, SketchImage);
}
|
#solarize(threshold = 50.0) ⇒ Object
Apply a special effect to the image, similar to the effect achieved in a photo darkroom by selectively exposing areas of photo sensitive paper to light. Threshold ranges from 0 to QuantumRange and is a measure of the extent of the solarization.
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# File 'ext/RMagick/rmimage.c', line 12778
VALUE
Image_solarize(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
double threshold = 50.0;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
switch (argc)
{
case 1:
threshold = NUM2DBL(argv[0]);
if (threshold < 0.0 || threshold > QuantumRange)
{
rb_raise(rb_eArgError, "threshold out of range, must be >= 0.0 and < QuantumRange");
}
case 0:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
break;
}
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
SolarizeImage(new_image, threshold, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
SolarizeImage(new_image, threshold);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#sparse_color(method, x1, y1, color) ⇒ Magick::Image #sparse_color(method, x1, y1, color, x2, y2, color) ⇒ Magick::Image #sparse_color(method, x1, y1, color, x2, y2, color, ...) ⇒ Magick::Image #sparse_color(method, x1, y1, color, channel) ⇒ Magick::Image #sparse_color(method, x1, y1, color, x2, y2, color, channel) ⇒ Magick::Image #sparse_color(method, x1, y1, color, x2, y2, color, ..., channel) ⇒ Magick::Image #sparse_color(method, x1, y1, color, channel, ...) ⇒ Magick::Image #sparse_color(method, x1, y1, color, x2, y2, color, channel, ...) ⇒ Magick::Image #sparse_color(method, x1, y1, color, x2, y2, color, ..., channel, ...) ⇒ Magick::Image
Fills the image with the specified color or colors, starting at the x,y coordinates associated with the color and using the specified interpolation method.
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# File 'ext/RMagick/rmimage.c', line 12944
VALUE
Image_sparse_color(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
unsigned long x, nargs, ncolors;
SparseColorMethod method;
int n, exp;
double * volatile args;
ChannelType channels;
MagickPixel pp;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
n = argc;
channels = extract_channels(&argc, argv);
n -= argc; // n is now the number of channel arguments
// After the channel arguments have been removed, and not counting the first
// (method) argument, the number of arguments should be a multiple of 3.
if (argc < 4 || argc % 3 != 1)
{
exp = (argc + 2) / 3 * 3;
exp = max(exp, 3);
rb_raise(rb_eArgError, "wrong number of arguments (expected at least %d, got %d)", n+exp+1, n+argc);
}
// Get the method from the argument list
VALUE_TO_ENUM(argv[0], method, SparseColorMethod);
argv += 1;
argc -= 1;
// A lot of the following code is based on SparseColorOption, in wand/mogrify.c
ncolors = count_channels(image, &channels);
nargs = (argc / 3) * (2 + ncolors);
// Allocate args from Ruby's memory so that GC will collect it if one of
// the type conversions below raises an exception.
args = ALLOC_N(double, nargs);
memset(args, 0, nargs * sizeof(double));
x = 0;
n = 0;
while (n < argc)
{
VALUE elem1 = argv[n++];
VALUE elem2 = argv[n++];
if (rm_check_num2dbl(elem1) && rm_check_num2dbl(elem2))
{
args[x++] = NUM2DBL(elem1);
args[x++] = NUM2DBL(elem2);
}
else
{
xfree((void *) args);
rb_raise(rb_eTypeError, "type mismatch: %s and %s given", rb_class2name(CLASS_OF(elem1)), rb_class2name(CLASS_OF(elem2)));
}
Color_to_MagickPixel(NULL, &pp, argv[n++]);
if (channels & RedChannel)
{
args[x++] = pp.red / QuantumRange;
}
if (channels & GreenChannel)
{
args[x++] = pp.green / QuantumRange;
}
if (channels & BlueChannel)
{
args[x++] = pp.blue / QuantumRange;
}
if (channels & IndexChannel)
{
args[x++] = pp.index / QuantumRange;
}
if (channels & OpacityChannel)
{
#if defined(IMAGEMAGICK_7)
args[x++] = pp.alpha / QuantumRange;
#else
args[x++] = pp.opacity / QuantumRange;
#endif
}
}
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
BEGIN_CHANNEL_MASK(image, channels);
new_image = SparseColorImage(image, method, nargs, args, exception);
CHANGE_RESULT_CHANNEL_MASK(new_image);
END_CHANNEL_MASK(image);
#else
new_image = SparseColorImage(image, channels, method, nargs, args, exception);
#endif
xfree((void *) args);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#splice(x, y, width, height, color = self.background_color) ⇒ Magick::Image
Splice a solid color into the part of the image specified by the x, y, width, and height arguments. If the color argument is specified it must be a color name or Pixel.
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# File 'ext/RMagick/rmimage.c', line 13059
VALUE
Image_splice(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
PixelColor color, old_color;
RectangleInfo rectangle;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
switch (argc)
{
case 4:
// use background color
color = image->background_color;
break;
case 5:
// Convert color argument to PixelColor
Color_to_PixelColor(&color, argv[4]);
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 4 or 5)", argc);
break;
}
rectangle.x = NUM2LONG(argv[0]);
rectangle.y = NUM2LONG(argv[1]);
rectangle.width = NUM2ULONG(argv[2]);
rectangle.height = NUM2ULONG(argv[3]);
exception = AcquireExceptionInfo();
// Swap in color for the duration of this call.
old_color = image->background_color;
image->background_color = color;
new_image = SpliceImage(image, &rectangle, exception);
image->background_color = old_color;
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#spread(radius = 3.0) ⇒ Magick::Image
Randomly displace each pixel in a block defined by “radius”.
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# File 'ext/RMagick/rmimage.c', line 13111
VALUE
Image_spread(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
double radius = 3.0;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
switch (argc)
{
case 1:
radius = NUM2DBL(argv[0]);
case 0:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
break;
}
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
new_image = SpreadImage(image, image->interpolate, radius, exception);
#else
new_image = SpreadImage(image, radius, exception);
#endif
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#start_loop ⇒ Boolean
Get the Boolean value that indicates the first image in an animation.
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# File 'ext/RMagick/rmimage.c', line 13148
VALUE
Image_start_loop(VALUE self)
{
IMPLEMENT_ATTR_READER(Image, start_loop, boolean);
}
|
#start_loop=(val) ⇒ Boolean
Set the Boolean value that indicates the first image in an animation.
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# File 'ext/RMagick/rmimage.c', line 13160
VALUE
Image_start_loop_eq(VALUE self, VALUE val)
{
IMPLEMENT_ATTR_WRITER(Image, start_loop, boolean);
}
|
#stegano(watermark_image, offset) ⇒ Magick::Image
Hides a digital watermark in the receiver. You can retrieve the watermark by reading the file with the stegano: prefix, thereby proving the authenticity of the file.
The watermarked image must be saved in a lossless RGB format such as MIFF, or PNG. You cannot save a watermarked image in a lossy format such as JPEG or a pseudocolor format such as GIF. Once written, the file must not be modified or processed in any way.
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# File 'ext/RMagick/rmimage.c', line 13179
VALUE
Image_stegano(VALUE self, VALUE watermark_image, VALUE offset)
{
Image *image, *new_image;
VALUE wm_image;
Image *watermark;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
wm_image = rm_cur_image(watermark_image);
watermark = rm_check_destroyed(wm_image);
image->offset = NUM2LONG(offset);
exception = AcquireExceptionInfo();
new_image = SteganoImage(image, watermark, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
RB_GC_GUARD(wm_image);
return rm_image_new(new_image);
}
|
#stereo(offset_image_arg) ⇒ Magick::Image
Combine two images and produces a single image that is the composite of a left and right image of a stereo pair. Special red-green stereo glasses are required to view this effect.
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# File 'ext/RMagick/rmimage.c', line 13213
VALUE
Image_stereo(VALUE self, VALUE offset_image_arg)
{
Image *image, *new_image;
VALUE offset_image;
Image *offset;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
offset_image = rm_cur_image(offset_image_arg);
offset = rm_check_destroyed(offset_image);
exception = AcquireExceptionInfo();
new_image = StereoImage(image, offset, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
RB_GC_GUARD(offset_image);
return rm_image_new(new_image);
}
|
#store_pixels(x_arg, y_arg, cols_arg, rows_arg, new_pixels) ⇒ Magick::Image
Replace the pixels in the specified rectangle with the pixels in the pixels array.
-
This is the complement of get_pixels. The array object returned by get_pixels is suitable for use as the “new_pixels” argument.
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# File 'ext/RMagick/rmimage.c', line 13329
VALUE
Image_store_pixels(VALUE self, VALUE x_arg, VALUE y_arg, VALUE cols_arg,
VALUE rows_arg, VALUE new_pixels)
{
Image *image;
Pixel *pixel;
VALUE new_pixel;
long n, size;
long x, y;
unsigned long cols, rows;
unsigned int okay;
ExceptionInfo *exception;
#if defined(IMAGEMAGICK_7)
Quantum *pixels;
#else
PixelPacket *pixels;
#endif
image = rm_check_destroyed(self);
x = NUM2LONG(x_arg);
y = NUM2LONG(y_arg);
cols = NUM2ULONG(cols_arg);
rows = NUM2ULONG(rows_arg);
if (x < 0 || y < 0 || x+cols > image->columns || y+rows > image->rows)
{
rb_raise(rb_eRangeError, "geometry (%lux%lu%+ld%+ld) exceeds image bounds",
cols, rows, x, y);
}
size = (long)(cols * rows);
new_pixels = rb_Array(new_pixels);
rm_check_ary_len(new_pixels, size);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
okay = SetImageStorageClass(image, DirectClass, exception);
CHECK_EXCEPTION();
if (!okay)
{
DestroyExceptionInfo(exception);
rb_raise(Class_ImageMagickError, "SetImageStorageClass failed. Can't store pixels.");
}
#else
okay = SetImageStorageClass(image, DirectClass);
rm_check_image_exception(image, RetainOnError);
if (!okay)
{
rb_raise(Class_ImageMagickError, "SetImageStorageClass failed. Can't store pixels.");
}
exception = AcquireExceptionInfo();
#endif
// Get a pointer to the pixels. Replace the values with the PixelPackets
// from the pixels argument.
{
pixels = GetAuthenticPixels(image, x, y, cols, rows, exception);
CHECK_EXCEPTION();
if (pixels)
{
#if defined(IMAGEMAGICK_6)
IndexPacket *indexes = GetAuthenticIndexQueue(image);
#endif
for (n = 0; n < size; n++)
{
new_pixel = rb_ary_entry(new_pixels, n);
if (CLASS_OF(new_pixel) != Class_Pixel)
{
DestroyExceptionInfo(exception);
rb_raise(rb_eTypeError, "Item in array should be a Pixel.");
}
Data_Get_Struct(new_pixel, Pixel, pixel);
#if defined(IMAGEMAGICK_7)
SetPixelRed(image, pixel->red, pixels);
SetPixelGreen(image, pixel->green, pixels);
SetPixelBlue(image, pixel->blue, pixels);
SetPixelAlpha(image, pixel->alpha, pixels);
SetPixelBlack(image, pixel->black, pixels);
pixels += GetPixelChannels(image);
#else
SetPixelRed(pixels, pixel->red);
SetPixelGreen(pixels, pixel->green);
SetPixelBlue(pixels, pixel->blue);
SetPixelOpacity(pixels, pixel->opacity);
if (indexes)
{
SetPixelIndex(indexes + n, pixel->black);
}
pixels++;
#endif
}
SyncAuthenticPixels(image, exception);
CHECK_EXCEPTION();
}
DestroyExceptionInfo(exception);
}
RB_GC_GUARD(new_pixel);
return self;
}
|
#strip! ⇒ Magick::Image
Strips an image of all profiles and comments.
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# File 'ext/RMagick/rmimage.c', line 13439
VALUE
Image_strip_bang(VALUE self)
{
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
Image *image = rm_check_frozen(self);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
StripImage(image, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
StripImage(image);
rm_check_image_exception(image, RetainOnError);
#endif
return self;
}
|
#swirl(degrees_obj) ⇒ Magick::Image
Swirl the pixels about the center of the image, where degrees indicates the sweep of the arc through which each pixel is moved. You get a more dramatic effect as the degrees move from 1 to 360.
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# File 'ext/RMagick/rmimage.c', line 13469
VALUE
Image_swirl(VALUE self, VALUE degrees_obj)
{
Image *image, *new_image;
ExceptionInfo *exception;
double degrees = NUM2DBL(degrees_obj);
image = rm_check_destroyed(self);
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
new_image = SwirlImage(image, degrees, image->interpolate, exception);
#else
new_image = SwirlImage(image, degrees, exception);
#endif
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#texture_fill_to_border(x, y, texture) ⇒ Object
Replace neighboring pixels to border color with texture pixels
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# File 'lib/rmagick_internal.rb', line 1056 def texture_fill_to_border(x, y, texture) texture_flood_fill(border_color, texture, x, y, FillToBorderMethod) end |
#texture_flood_fill(color_obj, texture_obj, x_obj, y_obj, method_obj) ⇒ Magick::Image
Emulates Magick++‘s floodFillTexture.
If the FloodfillMethod method is specified, flood-fills texture across pixels starting at the target pixel and matching the specified color.
If the FillToBorderMethod method is specified, flood-fills ‘texture across pixels starting at the target pixel and stopping at pixels matching the specified color.’
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# File 'ext/RMagick/rmimage.c', line 13508
VALUE
Image_texture_flood_fill(VALUE self, VALUE color_obj, VALUE texture_obj,
VALUE x_obj, VALUE y_obj, VALUE method_obj)
{
Image *image, *new_image;
Image *texture_image;
PixelColor color;
VALUE texture;
DrawInfo *draw_info;
long x, y;
PaintMethod method;
MagickPixel color_mpp;
MagickBooleanType invert;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
Color_to_PixelColor(&color, color_obj);
texture = rm_cur_image(texture_obj);
texture_image = rm_check_destroyed(texture);
x = NUM2LONG(x_obj);
y = NUM2LONG(y_obj);
if ((unsigned long)x > image->columns || (unsigned long)y > image->rows)
{
rb_raise(rb_eArgError, "target out of range. %ldx%ld given, image is %"RMIuSIZE"x%"RMIuSIZE"",
x, y, image->columns, image->rows);
}
VALUE_TO_ENUM(method_obj, method, PaintMethod);
if (method != FillToBorderMethod && method != FloodfillMethod)
{
rb_raise(rb_eArgError, "paint method must be FloodfillMethod or "
"FillToBorderMethod (%d given)", (int)method);
}
draw_info = CloneDrawInfo(NULL, NULL);
if (!draw_info)
{
rb_raise(rb_eNoMemError, "not enough memory to continue");
}
draw_info->fill_pattern = rm_clone_image(texture_image);
new_image = rm_clone_image(image);
rm_init_magickpixel(new_image, &color_mpp);
if (method == FillToBorderMethod)
{
invert = MagickTrue;
color_mpp.red = (MagickRealType) image->border_color.red;
color_mpp.green = (MagickRealType) image->border_color.green;
color_mpp.blue = (MagickRealType) image->border_color.blue;
}
else
{
invert = MagickFalse;
color_mpp.red = (MagickRealType) color.red;
color_mpp.green = (MagickRealType) color.green;
color_mpp.blue = (MagickRealType) color.blue;
}
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
FloodfillPaintImage(new_image, draw_info, &color_mpp, x, y, invert, exception);
DestroyDrawInfo(draw_info);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
FloodfillPaintImage(new_image, DefaultChannels, draw_info, &color_mpp, x, y, invert);
DestroyDrawInfo(draw_info);
rm_check_image_exception(new_image, DestroyOnError);
#endif
RB_GC_GUARD(texture);
return rm_image_new(new_image);
}
|
#texture_floodfill(x, y, texture) ⇒ Object
Replace matching neighboring pixels with texture pixels
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# File 'lib/rmagick_internal.rb', line 1050 def texture_floodfill(x, y, texture) target = pixel_color(x, y) texture_flood_fill(target, texture, x, y, FloodfillMethod) end |
#threshold(threshold_obj) ⇒ Magick::Image
Change the value of individual pixels based on the intensity of each pixel compared to threshold. The result is a high-contrast, two color image.
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# File 'ext/RMagick/rmimage.c', line 13599
VALUE
Image_threshold(VALUE self, VALUE threshold_obj)
{
Image *image, *new_image;
double threshold = NUM2DBL(threshold_obj);
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
BilevelImage(new_image, threshold, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
BilevelImageChannel(new_image, DefaultChannels, threshold);
rm_check_image_exception(new_image, DestroyOnError);
#endif
return rm_image_new(new_image);
}
|
#thumbnail(scale) ⇒ Magick::Image #thumbnail(cols, rows) ⇒ Magick::Image
The thumbnail method is a fast resizing method suitable for use when the size of the resulting image is < 10% of the original.
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# File 'ext/RMagick/rmimage.c', line 13786
VALUE
Image_thumbnail(int argc, VALUE *argv, VALUE self)
{
rm_check_destroyed(self);
return thumbnail(False, argc, argv, self);
}
|
#thumbnail!(scale) ⇒ Magick::Image #thumbnail!(cols, rows) ⇒ Magick::Image
The thumbnail method is a fast resizing method suitable for use when the size of the resulting image is < 10% of the original. In-place form of #thumbnail.
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# File 'ext/RMagick/rmimage.c', line 13808
VALUE
Image_thumbnail_bang(int argc, VALUE *argv, VALUE self)
{
rm_check_frozen(self);
return thumbnail(True, argc, argv, self);
}
|
#ticks_per_second ⇒ Numeric
Get the number of ticks per second. This attribute is used in conjunction with the delay attribute to establish the amount of time that must elapse between frames in an animation.The default is 100.
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# File 'ext/RMagick/rmimage.c', line 13823
VALUE
Image_ticks_per_second(VALUE self)
{
Image *image = rm_check_destroyed(self);
return INT2FIX(image->ticks_per_second);
}
|
#ticks_per_second=(tps) ⇒ Numeric
Set the number of ticks per second. This attribute is used in conjunction with the delay attribute to establish the amount of time that must elapse between frames in an animation.The default is 100.
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# File 'ext/RMagick/rmimage.c', line 13839
VALUE
Image_ticks_per_second_eq(VALUE self, VALUE tps)
{
Image *image = rm_check_frozen(self);
image->ticks_per_second = NUM2ULONG(tps);
return tps;
}
|
#tint(tint, red_alpha, green_alpha = red_alpha, blue_alpha = red_alpha, alpha_alpha = 1.0) ⇒ Object
Applies a color vector to each pixel in the image.
-
Alpha values are percentages: 0.10 -> 10%.
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# File 'ext/RMagick/rmimage.c', line 13861
VALUE
Image_tint(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
PixelColor tint;
double red_pct_opaque, green_pct_opaque, blue_pct_opaque;
double alpha_pct_opaque = 1.0;
char alpha[50];
ExceptionInfo *exception;
image = rm_check_destroyed(self);
switch (argc)
{
case 2:
red_pct_opaque = NUM2DBL(argv[1]);
green_pct_opaque = blue_pct_opaque = red_pct_opaque;
break;
case 3:
red_pct_opaque = NUM2DBL(argv[1]);
green_pct_opaque = NUM2DBL(argv[2]);
blue_pct_opaque = red_pct_opaque;
break;
case 4:
red_pct_opaque = NUM2DBL(argv[1]);
green_pct_opaque = NUM2DBL(argv[2]);
blue_pct_opaque = NUM2DBL(argv[3]);
break;
case 5:
red_pct_opaque = NUM2DBL(argv[1]);
green_pct_opaque = NUM2DBL(argv[2]);
blue_pct_opaque = NUM2DBL(argv[3]);
alpha_pct_opaque = NUM2DBL(argv[4]);
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 to 5)", argc);
break;
}
if (red_pct_opaque < 0.0 || green_pct_opaque < 0.0
|| blue_pct_opaque < 0.0 || alpha_pct_opaque < 0.0)
{
rb_raise(rb_eArgError, "alpha percentages must be non-negative.");
}
snprintf(alpha, sizeof(alpha),
"%g,%g,%g,%g", red_pct_opaque*100.0, green_pct_opaque*100.0,
blue_pct_opaque*100.0, alpha_pct_opaque*100.0);
Color_to_PixelColor(&tint, argv[0]);
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
new_image = TintImage(image, alpha, &tint, exception);
#else
new_image = TintImage(image, alpha, tint, exception);
#endif
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#to_blob ⇒ String
Return a “blob” (a String) from the image.
-
The magick member of the Image structure determines the format of the returned blob (GIG, JPEG, PNG, etc.)
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# File 'ext/RMagick/rmimage.c', line 13934
VALUE
Image_to_blob(VALUE self)
{
Image *image;
Info *info;
const MagickInfo *magick_info;
VALUE info_obj;
VALUE blob_str;
void *blob = NULL;
size_t length = 2048; // Do what Magick++ does
ExceptionInfo *exception;
// The user can specify the depth (8 or 16, if the format supports
// both) and the image format by setting the depth and format
// values in the info parm block.
info_obj = rm_info_new();
Data_Get_Struct(info_obj, Info, info);
image = rm_check_destroyed(self);
exception = AcquireExceptionInfo();
// Copy the depth and magick fields to the Image
if (info->depth != 0)
{
#if defined(IMAGEMAGICK_7)
SetImageDepth(image, info->depth, exception);
CHECK_EXCEPTION();
#else
SetImageDepth(image, info->depth);
rm_check_image_exception(image, RetainOnError);
#endif
}
if (*info->magick)
{
SetImageInfo(info, MagickTrue, exception);
CHECK_EXCEPTION();
if (*info->magick == '\0')
{
return Qnil;
}
strlcpy(image->magick, info->magick, sizeof(image->magick));
}
// Fix #2844 - libjpeg exits when image is 0x0
magick_info = GetMagickInfo(image->magick, exception);
CHECK_EXCEPTION();
if (magick_info)
{
if ( (!rm_strcasecmp(magick_info->name, "JPEG")
|| !rm_strcasecmp(magick_info->name, "JPG"))
&& (image->rows == 0 || image->columns == 0))
{
rb_raise(rb_eRuntimeError, "Can't convert %"RMIuSIZE"x%"RMIuSIZE" %.4s image to a blob",
image->columns, image->rows, magick_info->name);
}
}
rm_sync_image_options(image, info);
blob = ImageToBlob(info, image, &length, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
if (length == 0 || !blob)
{
return Qnil;
}
blob_str = rb_str_new(blob, length);
magick_free((void*)blob);
RB_GC_GUARD(info_obj);
RB_GC_GUARD(blob_str);
return blob_str;
}
|
#to_color(pixel_arg) ⇒ String
Return a color name for the color intensity specified by the Magick::Pixel argument.
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# File 'ext/RMagick/rmimage.c', line 14024
VALUE
Image_to_color(VALUE self, VALUE pixel_arg)
{
Image *image;
PixelColor pixel;
ExceptionInfo *exception;
char name[MaxTextExtent];
image = rm_check_destroyed(self);
Color_to_PixelColor(&pixel, pixel_arg);
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
pixel.depth = MAGICKCORE_QUANTUM_DEPTH;
pixel.colorspace = image->colorspace;
#endif
// QueryColorname returns False if the color represented by the PixelPacket
// doesn't have a "real" name, just a sequence of hex digits. We don't care
// about that.
QueryColorname(image, &pixel, AllCompliance, name, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
return rb_str_new2(name);
}
|
#total_colors ⇒ Numeric
Alias for #number_colors.
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# File 'ext/RMagick/rmimage.c', line 14061
VALUE
Image_total_colors(VALUE self)
{
return Image_number_colors(self);
}
|
#total_ink_density ⇒ Float
Return the total ink density for a CMYK image.
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# File 'ext/RMagick/rmimage.c', line 14073
VALUE
Image_total_ink_density(VALUE self)
{
Image *image;
double density;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
density = GetImageTotalInkDensity(image, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
density = GetImageTotalInkDensity(image);
rm_check_image_exception(image, RetainOnError);
#endif
return rb_float_new(density);
}
|
#transparent(color, alpha: Magick::TransparentAlpha) ⇒ Magick::Image
Changes the opacity value of all the pixels that match color to the value specified by opacity. By default the pixel must match exactly, but you can specify a tolerance level by setting the fuzz attribute on the image.
-
Default alpha is Magick::TransparentAlpha.
-
Can use Magick::OpaqueAlpha or Magick::TransparentAlpha, or any value >= 0 && <= QuantumRange.
-
Use Image#fuzz= to define the tolerance level.
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# File 'ext/RMagick/rmimage.c', line 14113
VALUE
Image_transparent(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
MagickPixel color;
Quantum alpha = TransparentAlpha;
MagickBooleanType okay;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
switch (argc)
{
case 2:
alpha = get_named_alpha_value(argv[1]);
case 1:
Color_to_MagickPixel(image, &color, argv[0]);
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 or 2)", argc);
break;
}
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
okay = TransparentPaintImage(new_image, &color, alpha, MagickFalse, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
okay = TransparentPaintImage(new_image, &color, QuantumRange - alpha, MagickFalse);
rm_check_image_exception(new_image, DestroyOnError);
#endif
if (!okay)
{
// Force exception
DestroyImage(new_image);
rm_magick_error("TransparentPaintImage failed with no explanation");
}
return rm_image_new(new_image);
}
|
#transparent_chroma(low, high, invert, alpha: Magick::TransparentAlpha) ⇒ Magick::Image
Changes the opacity value associated with any pixel between low and high to the value defined by opacity.
As there is one fuzz value for the all the channels, the transparent method is not suitable for the operations like chroma, where the tolerance for similarity of two color components (RGB) can be different, Thus we define this method take two target pixels (one low and one high) and all the pixels of an image which are lying between these two pixels are made transparent.
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# File 'ext/RMagick/rmimage.c', line 14177
VALUE
Image_transparent_chroma(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
Quantum alpha = TransparentAlpha;
MagickPixel low, high;
MagickBooleanType invert = MagickFalse;
MagickBooleanType okay;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
switch (argc)
{
case 4:
if (TYPE(argv[argc - 1]) == T_HASH)
{
invert = RTEST(argv[3]);
}
else
{
invert = RTEST(argv[2]);
}
case 3:
alpha = get_named_alpha_value(argv[argc - 1]);
case 2:
Color_to_MagickPixel(image, &high, argv[1]);
Color_to_MagickPixel(image, &low, argv[0]);
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 2, 3 or 4)", argc);
break;
}
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
okay = TransparentPaintImageChroma(new_image, &low, &high, alpha, invert, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
okay = TransparentPaintImageChroma(new_image, &low, &high, QuantumRange - alpha, invert);
rm_check_image_exception(new_image, DestroyOnError);
#endif
if (!okay)
{
// Force exception
DestroyImage(new_image);
rm_magick_error("TransparentPaintImageChroma failed with no explanation");
}
return rm_image_new(new_image);
}
|
#transparent_color ⇒ String
Return the name of the transparent color as a String.
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# File 'ext/RMagick/rmimage.c', line 14240
VALUE
Image_transparent_color(VALUE self)
{
Image *image = rm_check_destroyed(self);
return rm_pixelcolor_to_color_name(image, &image->transparent_color);
}
|
#transparent_color=(color) ⇒ Magick::Pixel, String
Set the the transparent color to the specified color spec.
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# File 'ext/RMagick/rmimage.c', line 14254
VALUE
Image_transparent_color_eq(VALUE self, VALUE color)
{
Image *image = rm_check_frozen(self);
Color_to_PixelColor(&image->transparent_color, color);
return color;
}
|
#transpose ⇒ Magick::Image
Creates a horizontal mirror image by reflecting the pixels around the central y-axis while rotating them by 90 degrees.
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# File 'ext/RMagick/rmimage.c', line 14270
VALUE
Image_transpose(VALUE self)
{
rm_check_destroyed(self);
return crisscross(False, self, TransposeImage);
}
|
#transpose! ⇒ Magick::Image
Creates a horizontal mirror image by reflecting the pixels around the central y-axis while rotating them by 90 degrees. In-place form of #transpose.
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# File 'ext/RMagick/rmimage.c', line 14286
VALUE
Image_transpose_bang(VALUE self)
{
rm_check_frozen(self);
return crisscross(True, self, TransposeImage);
}
|
#transverse ⇒ Magick::Image
Creates a vertical mirror image by reflecting the pixels around the central x-axis while rotating them by 270 degrees
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# File 'ext/RMagick/rmimage.c', line 14301
VALUE
Image_transverse(VALUE self)
{
rm_check_destroyed(self);
return crisscross(False, self, TransverseImage);
}
|
#transverse! ⇒ Magick::Image
Creates a vertical mirror image by reflecting the pixels around the central x-axis while rotating them by 270 degrees In-place form of #transverse.
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# File 'ext/RMagick/rmimage.c', line 14316
VALUE
Image_transverse_bang(VALUE self)
{
rm_check_frozen(self);
return crisscross(True, self, TransverseImage);
}
|
#trim(reset = false) ⇒ Magick::Image
Removes the edges that are exactly the same color as the corner pixels. Use the fuzz attribute to make trim remove edges that are nearly the same color as the corner pixels.
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# File 'ext/RMagick/rmimage.c', line 14395
VALUE
Image_trim(int argc, VALUE *argv, VALUE self)
{
rm_check_destroyed(self);
return trimmer(False, argc, argv, self);
}
|
#trim!(reset = false) ⇒ Magick::Image
Removes the edges that are exactly the same color as the corner pixels. Use the fuzz attribute to make trim remove edges that are nearly the same color as the corner pixels.
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# File 'ext/RMagick/rmimage.c', line 14415
VALUE
Image_trim_bang(int argc, VALUE *argv, VALUE self)
{
rm_check_frozen(self);
return trimmer(True, argc, argv, self);
}
|
#undefine(artifact) ⇒ Magick::Image
Removes an artifact from the image and returns its value.
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# File 'ext/RMagick/rmimage.c', line 14514
VALUE
Image_undefine(VALUE self, VALUE artifact)
{
Image *image;
char *key;
image = rm_check_frozen(self);
key = StringValueCStr(artifact);
DeleteImageArtifact(image, key);
return self;
}
|
#unique_colors ⇒ Magick::Image
Constructs a new image with one pixel for each unique color in the image. The new image has 1 row. The row has 1 column for each unique pixel in the image.
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# File 'ext/RMagick/rmimage.c', line 14533
VALUE
Image_unique_colors(VALUE self)
{
Image *image, *new_image;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
exception = AcquireExceptionInfo();
new_image = UniqueImageColors(image, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#units ⇒ Magick::ResolutionType
Get the units of image resolution.
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# File 'ext/RMagick/rmimage.c', line 14555
VALUE
Image_units(VALUE self)
{
Image *image = rm_check_destroyed(self);
return ResolutionType_find(image->units);
}
|
#units=(restype) ⇒ Magick::ResolutionType
Set the units of image resolution.
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# File 'ext/RMagick/rmimage.c', line 14569
VALUE
Image_units_eq(VALUE self, VALUE restype)
{
ResolutionType units;
Image *image = rm_check_frozen(self);
VALUE_TO_ENUM(restype, units, ResolutionType);
if (image->units != units)
{
switch (image->units)
{
case PixelsPerInchResolution:
if (units == PixelsPerCentimeterResolution)
{
#if defined(IMAGEMAGICK_7)
image->resolution.x /= 2.54;
image->resolution.y /= 2.54;
#else
image->x_resolution /= 2.54;
image->y_resolution /= 2.54;
#endif
}
break;
case PixelsPerCentimeterResolution:
if (units == PixelsPerInchResolution)
{
#if defined(IMAGEMAGICK_7)
image->resolution.x *= 2.54;
image->resolution.y *= 2.54;
#else
image->x_resolution *= 2.54;
image->y_resolution *= 2.54;
#endif
}
break;
default:
// UndefinedResolution
#if defined(IMAGEMAGICK_7)
image->resolution.x = 0.0;
image->resolution.y = 0.0;
#else
image->x_resolution = 0.0;
image->y_resolution = 0.0;
#endif
break;
}
image->units = units;
}
return restype;
}
|
#unsharp_mask(radius = 0.0, sigma = 1.0, amount = 1.0, threshold = 0.05) ⇒ Magick::Image
Sharpen an image. “amount” is the percentage of the difference between the original and the blur image that is added back into the original. “threshold” is the threshold in pixels needed to apply the diffence amount.
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# File 'ext/RMagick/rmimage.c', line 14696
VALUE
Image_unsharp_mask(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
double radius = 0.0, sigma = 1.0, amount = 1.0, threshold = 0.05;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
unsharp_mask_args(argc, argv, &radius, &sigma, &amount, &threshold);
exception = AcquireExceptionInfo();
new_image = UnsharpMaskImage(image, radius, sigma, amount, threshold, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#unsharp_mask(radius = 0.0, sigma = 1.0, amount = 1.0, threshold = 0.05, channel = Magick::AllChannels) ⇒ Magick::Image #unsharp_mask(radius = 0.0, sigma = 1.0, amount = 1.0, threshold = 0.05, *channels) ⇒ Magick::Image
Sharpen an image. “amount” is the percentage of the difference between the original and the blur image that is added back into the original. “threshold” is the threshold in pixels needed to apply the diffence amount.
Only the specified channels are sharpened.
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# File 'ext/RMagick/rmimage.c', line 14743
VALUE
Image_unsharp_mask_channel(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
ChannelType channels;
double radius = 0.0, sigma = 1.0, amount = 1.0, threshold = 0.05;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
channels = extract_channels(&argc, argv);
if (argc > 4)
{
raise_ChannelType_error(argv[argc-1]);
}
unsharp_mask_args(argc, argv, &radius, &sigma, &amount, &threshold);
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
BEGIN_CHANNEL_MASK(image, channels);
new_image = UnsharpMaskImage(image, radius, sigma, amount, threshold, exception);
CHANGE_RESULT_CHANNEL_MASK(new_image);
END_CHANNEL_MASK(image);
#else
new_image = UnsharpMaskImageChannel(image, channels, radius, sigma, amount, threshold, exception);
#endif
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#view(x, y, width, height) ⇒ Object
Construct a view. If a block is present, yield and pass the view object, otherwise return the view object.
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# File 'lib/rmagick_internal.rb', line 1062 def view(x, y, width, height) view = View.new(self, x, y, width, height) return view unless block_given? begin yield(view) ensure view.sync end nil end |
#vignette(horz_radius = self.columns*0.1+0.5, vert_radius = self.rows*0.1+0.5, radius = 0.0, sigma = 1.0) ⇒ Magick::Image
Soften the edges of an image.
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# File 'ext/RMagick/rmimage.c', line 14786
VALUE
Image_vignette(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
long horz_radius, vert_radius;
double radius = 0.0, sigma = 10.0;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
horz_radius = (long)(image->columns * 0.10 + 0.5);
vert_radius = (long)(image->rows * 0.10 + 0.5);
switch (argc)
{
case 4:
sigma = NUM2DBL(argv[3]);
case 3:
radius = NUM2DBL(argv[2]);
case 2:
vert_radius = NUM2INT(argv[1]);
case 1:
horz_radius = NUM2INT(argv[0]);
case 0:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 4)", argc);
break;
}
exception = AcquireExceptionInfo();
new_image = VignetteImage(image, radius, sigma, horz_radius, vert_radius, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#virtual_pixel_method ⇒ Magick::VirtualPixelMethod
Get the “virtual pixels” behave. Virtual pixels are pixels that are outside the boundaries of the image.
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# File 'ext/RMagick/rmimage.c', line 14832
VALUE
Image_virtual_pixel_method(VALUE self)
{
Image *image;
VirtualPixelMethod vpm;
image = rm_check_destroyed(self);
vpm = GetImageVirtualPixelMethod(image);
return VirtualPixelMethod_find(vpm);
}
|
#virtual_pixel_method=(method) ⇒ Magick::VirtualPixelMethod
Specify how “virtual pixels” behave. Virtual pixels are pixels that are outside the boundaries of the image.
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# File 'ext/RMagick/rmimage.c', line 14851
VALUE
Image_virtual_pixel_method_eq(VALUE self, VALUE method)
{
Image *image;
VirtualPixelMethod vpm;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_frozen(self);
VALUE_TO_ENUM(method, vpm, VirtualPixelMethod);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
SetImageVirtualPixelMethod(image, vpm, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
SetImageVirtualPixelMethod(image, vpm);
rm_check_image_exception(image, RetainOnError);
#endif
return method;
}
|
#watermark(mark, brightness = 1.0, saturation = 1.0, x_off = 0, y_off = 0) ⇒ Magick::Image #watermark(mark, brightness, saturation, gravity, x_off = 0, y_off = 0) ⇒ Magick::Image
Composites a watermark image on the target image using the Modulate composite operator. This composite operation operates in the HSL colorspace and combines part of the lightness, part of the saturation, and all of the hue of each pixel in the watermark with the corresponding pixel in the target image
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# File 'ext/RMagick/rmimage.c', line 14915
VALUE
Image_watermark(int argc, VALUE *argv, VALUE self)
{
Image *image, *overlay, *new_image;
double src_percent = 100.0, dst_percent = 100.0;
long x_offset = 0L, y_offset = 0L;
char geometry[20];
VALUE ovly;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
if (argc < 1)
{
rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 to 6)", argc);
}
ovly = rm_cur_image(argv[0]);
overlay = rm_check_destroyed(ovly);
if (argc > 3)
{
get_composite_offsets(argc-3, &argv[3], image, overlay, &x_offset, &y_offset);
// There must be 3 arguments left
argc = 3;
}
switch (argc)
{
case 3:
dst_percent = rm_percentage(argv[2], 1.0) * 100.0;
case 2:
src_percent = rm_percentage(argv[1], 1.0) * 100.0;
case 1:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 2 to 6)", argc);
break;
}
blend_geometry(geometry, sizeof(geometry), src_percent, dst_percent);
CloneString(&overlay->geometry, geometry);
SetImageArtifact(overlay, "compose:args", geometry);
new_image = rm_clone_image(image);
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
CompositeImage(new_image, overlay, ModulateCompositeOp, MagickTrue, x_offset, y_offset, exception);
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
#else
CompositeImage(new_image, ModulateCompositeOp, overlay, x_offset, y_offset);
rm_check_image_exception(new_image, DestroyOnError);
#endif
RB_GC_GUARD(ovly);
return rm_image_new(new_image);
}
|
#wave(amplitude = 25.0, wavelength = 150.0) ⇒ Magick::Image
Create a “ripple” effect in the image by shifting the pixels vertically along a sine wave whose amplitude and wavelength is specified by the given parameters.
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# File 'ext/RMagick/rmimage.c', line 14988
VALUE
Image_wave(int argc, VALUE *argv, VALUE self)
{
Image *image, *new_image;
double amplitude = 25.0, wavelength = 150.0;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
switch (argc)
{
case 2:
wavelength = NUM2DBL(argv[1]);
case 1:
amplitude = NUM2DBL(argv[0]);
case 0:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 2)", argc);
break;
}
exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
new_image = WaveImage(image, amplitude, wavelength, image->interpolate, exception);
#else
new_image = WaveImage(image, amplitude, wavelength, exception);
#endif
rm_check_exception(exception, new_image, DestroyOnError);
DestroyExceptionInfo(exception);
return rm_image_new(new_image);
}
|
#wet_floor(initial = 0.5, rate = 1.0) ⇒ Magick::Image
Creates a “wet floor” reflection. The reflection is an inverted copy of the image that changes from partially transparent to entirely transparent. By default only the bottom third of the image appears in the reflection.
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# File 'ext/RMagick/rmimage.c', line 15041
VALUE
Image_wet_floor(int argc, VALUE *argv, VALUE self)
{
Image *image, *reflection, *flip_image;
#if defined(IMAGEMAGICK_7)
const Quantum *p;
Quantum *q;
#else
const PixelPacket *p;
PixelPacket *q;
#endif
RectangleInfo geometry;
long x, y, max_rows;
double initial = 0.5;
double rate = 1.0;
double opacity, step;
const char *func;
ExceptionInfo *exception;
image = rm_check_destroyed(self);
switch (argc)
{
case 2:
rate = NUM2DBL(argv[1]);
case 1:
initial = NUM2DBL(argv[0]);
case 0:
break;
default:
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 2)", argc);
break;
}
if (initial < 0.0 || initial > 1.0)
{
rb_raise(rb_eArgError, "Initial transparency must be in the range 0.0-1.0 (%g)", initial);
}
if (rate < 0.0)
{
rb_raise(rb_eArgError, "Transparency change rate must be >= 0.0 (%g)", rate);
}
#if defined(IMAGEMAGICK_7)
initial *= QuantumRange;
#else
initial *= TransparentOpacity;
#endif
// The number of rows in which to transition from the initial level of
// transparency to complete transparency. rate == 0.0 -> no change.
if (rate > 0.0)
{
max_rows = (long)((double)image->rows) / (3.0 * rate);
max_rows = (long)min((unsigned long)max_rows, image->rows);
#if defined(IMAGEMAGICK_7)
step = (QuantumRange - initial) / max_rows;
#else
step = (TransparentOpacity - initial) / max_rows;
#endif
}
else
{
max_rows = (long)image->rows;
step = 0.0;
}
exception = AcquireExceptionInfo();
flip_image = FlipImage(image, exception);
CHECK_EXCEPTION();
geometry.x = 0;
geometry.y = 0;
geometry.width = image->columns;
geometry.height = max_rows;
reflection = CropImage(flip_image, &geometry, exception);
DestroyImage(flip_image);
CHECK_EXCEPTION();
#if defined(IMAGEMAGICK_7)
SetImageStorageClass(reflection, DirectClass, exception);
rm_check_exception(exception, reflection, DestroyOnError);
SetImageAlphaChannel(reflection, ActivateAlphaChannel, exception);
rm_check_exception(exception, reflection, DestroyOnError);
#else
SetImageStorageClass(reflection, DirectClass);
rm_check_image_exception(reflection, DestroyOnError);
reflection->matte = MagickTrue;
#endif
opacity = initial;
for (y = 0; y < max_rows; y++)
{
#if defined(IMAGEMAGICK_7)
if (opacity > QuantumRange)
{
opacity = QuantumRange;
}
#else
if (opacity > TransparentOpacity)
{
opacity = TransparentOpacity;
}
#endif
p = GetVirtualPixels(reflection, 0, y, image->columns, 1, exception);
rm_check_exception(exception, reflection, DestroyOnError);
if (!p)
{
func = "AcquireImagePixels";
goto error;
}
q = QueueAuthenticPixels(reflection, 0, y, image->columns, 1, exception);
rm_check_exception(exception, reflection, DestroyOnError);
if (!q)
{
func = "SetImagePixels";
goto error;
}
for (x = 0; x < (long) image->columns; x++)
{
// Never make a pixel *less* transparent than it already is.
#if defined(IMAGEMAGICK_7)
*q = *p;
SetPixelAlpha(reflection, min(GetPixelAlpha(image, q), QuantumRange - (Quantum)opacity), q);
p += GetPixelChannels(reflection);
q += GetPixelChannels(reflection);
#else
q[x] = p[x];
q[x].opacity = max(q[x].opacity, (Quantum)opacity);
#endif
}
SyncAuthenticPixels(reflection, exception);
rm_check_exception(exception, reflection, DestroyOnError);
opacity += step;
}
DestroyExceptionInfo(exception);
return rm_image_new(reflection);
error:
DestroyExceptionInfo(exception);
DestroyImage(reflection);
rb_raise(rb_eRuntimeError, "%s failed on row %lu", func, y);
return(VALUE)0;
}
|
#white_threshold(red, green, blue, alpha: alpha) ⇒ Magick::Image
Forces all pixels above the threshold into white while leaving all pixels below the threshold unchanged.
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# File 'ext/RMagick/rmimage.c', line 15214
VALUE
Image_white_threshold(int argc, VALUE *argv, VALUE self)
{
return threshold_image(argc, argv, self, WhiteThresholdImage);
}
|
#write(file) ⇒ Magick::Image
Write the image to the file.
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# File 'ext/RMagick/rmimage.c', line 15317
VALUE
Image_write(VALUE self, VALUE file)
{
Image *image;
Info *info;
VALUE info_obj;
#if defined(IMAGEMAGICK_7)
ExceptionInfo *exception;
#endif
image = rm_check_destroyed(self);
info_obj = rm_info_new();
Data_Get_Struct(info_obj, Info, info);
if (TYPE(file) == T_FILE)
{
rb_io_t *fptr;
// Ensure file is open - raise error if not
GetOpenFile(file, fptr);
rb_io_check_writable(fptr);
#if defined(_WIN32)
add_format_prefix(info, fptr->pathv);
strlcpy(image->filename, info->filename, sizeof(image->filename));
SetImageInfoFile(info, NULL);
#else
SetImageInfoFile(info, rb_io_stdio_file(fptr));
memset(image->filename, 0, sizeof(image->filename));
#endif
}
else
{
add_format_prefix(info, file);
strlcpy(image->filename, info->filename, sizeof(image->filename));
SetImageInfoFile(info, NULL);
}
rm_sync_image_options(image, info);
info->adjoin = MagickFalse;
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
WriteImage(info, image, exception);
CHECK_EXCEPTION();
DestroyExceptionInfo(exception);
#else
WriteImage(info, image);
rm_check_image_exception(image, RetainOnError);
#endif
RB_GC_GUARD(info_obj);
return self;
}
|
#x_resolution ⇒ Float
Get the horizontal resolution of the image.
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# File 'ext/RMagick/rmimage.c', line 15425
VALUE
Image_x_resolution(VALUE self)
{
IMPLEMENT_ATTR_READER(Image, x_resolution, dbl);
}
|
#x_resolution=(val) ⇒ Float
Set the horizontal resolution of the image.
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# File 'ext/RMagick/rmimage.c', line 15437
VALUE
Image_x_resolution_eq(VALUE self, VALUE val)
{
IMPLEMENT_ATTR_WRITER(Image, x_resolution, dbl);
}
|
#y_resolution ⇒ Float
Get the vertical resolution of the image.
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# File 'ext/RMagick/rmimage.c', line 15448
VALUE
Image_y_resolution(VALUE self)
{
IMPLEMENT_ATTR_READER(Image, y_resolution, dbl);
}
|
#y_resolution=(val) ⇒ Float
Set the vertical resolution of the image.
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# File 'ext/RMagick/rmimage.c', line 15460
VALUE
Image_y_resolution_eq(VALUE self, VALUE val)
{
IMPLEMENT_ATTR_WRITER(Image, y_resolution, dbl);
}
|