Class: Magick::Image

Inherits:
Object
  • Object
show all
Includes:
Comparable
Defined in:
lib/RMagick.rb,
ext/RMagick/rmmain.c

Overview

Ruby-level Magick::Image methods

Defined Under Namespace

Classes: DrawOptions, Info, PolaroidOptions, View

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initializeObject

Class Method Details

._loadObject

.captureObject

.combineObject

.constituteObject

.from_blobObject

.pingObject

.readObject

.read_inlineObject

Instance Method Details

#<=>Object

#[]Object

#[]=Object

#_dumpObject

#adaptive_blurObject

do not document! Only used by Image#iterations=

#adaptive_blur_channelObject

#adaptive_resizeObject

#adaptive_sharpenObject

#adaptive_sharpen_channelObject

#adaptive_thresholdObject

#add_compose_maskObject

#add_noiseObject

#add_noise_channelObject

#add_profileObject

#affine_transformObject

#affinityObject

#alphaObject

#alpha?Boolean

Returns:

  • (Boolean)

#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.rb', line 739

def annotate(draw, width, height, x, y, text, &block)
  check_destroyed
  draw.annotate(self, width, height, x, y, text, &block)
  self
end

#auto_orientObject

#auto_orient!Object

#bilevel_channelObject

#black_thresholdObject

#blendObject

#blur_channelObject

#blur_imageObject

#borderObject

#border!Object

#change_geometryObject

#change_geometry!Object

#changed?Boolean

Returns:

  • (Boolean)

#channelObject

#channel_compareObject

An alias for compare_channel

#channel_depthObject

#channel_extremaObject

#channel_meanObject

#charcoalObject

#check_destroyedObject

#chopObject

#cloneObject

#clut_channelObject

#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.rb', line 761

def color_fill_to_border(x, y, fill)
    color_flood_fill(border_color, fill, x, y, Magick::FillToBorderMethod)
end

#color_flood_fillObject

#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.rb', line 754

def color_floodfill(x, y, fill)
    target = pixel_color(x, y)
    color_flood_fill(target, fill, x, y, Magick::FloodfillMethod)
end

#color_histogramObject

#color_point(x, y, fill) ⇒ Object

Set the color at x,y


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# File 'lib/RMagick.rb', line 746

def color_point(x, y, fill)
    f = copy
    f.pixel_color(x, y, fill)
    return f
end

#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.rb', line 767

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

#colorizeObject

#colormapObject

#compare_channelObject

#compositeObject

#composite!Object

#composite_affineObject

#composite_channelObject

#composite_channel!Object

#composite_tiledObject

#composite_tiled!Object

#compress_colormap!Object

#contrastObject

#contrast_stretch_channelObject

#convolveObject

#convolve_channelObject

#copyObject

#cropObject

#crop!Object

#cur_imageObject

Used by ImageList methods - see ImageList#cur_image


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# File 'lib/RMagick.rb', line 782

def cur_image
    self
end

#cycle_colormapObject

#decipherObject

#defineObject

#delete_compose_maskObject

#delete_profileObject

#deskewObject

#despeckleObject

#destroy!Object

#destroyed?Boolean

Returns:

  • (Boolean)

#differenceObject

#dispatchObject

#displaceObject

#displayObject Also known as: __display__

#dissolveObject

#distortObject

#distortion_channelObject

#dupObject

#each_iptc_datasetObject

Iterate over IPTC record number:dataset tags, yield for each non-nil dataset


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# File 'lib/RMagick.rb', line 844

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_pixelObject

Thanks to Russell Norris!


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# File 'lib/RMagick.rb', line 787

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_profileObject

#edgeObject

#embossObject

#encipherObject

#enhanceObject

#equalizeObject

#equalize_channelObject

#erase!Object

#excerptObject

#excerpt!Object

#export_pixelsObject

#export_pixels_to_strObject

#extentObject

#find_similar_regionObject

#flipObject

#flip!Object

#flopObject

#flop!Object

#frameObject

#gamma_channelObject

#gamma_correctObject

#gaussian_blurObject

#gaussian_blur_channelObject

#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.rb', line 798

def get_exif_by_entry(*entry)
    ary = Array.new
    if entry.length == 0
        exif_data = self['EXIF:*']
        if exif_data
            exif_data.split("\n").each { |exif| ary.push(exif.split('=')) }
        end
    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
    return 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.rb', line 816

def get_exif_by_number(*tag)
    hash = Hash.new
    if tag.length == 0
        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['#%04X' % num.to_i]
            hash[num] = rval == 'unknown' ? nil : rval
        end
    end
    return 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.rb', line 839

def get_iptc_dataset(ds)
    self['IPTC:'+ds]
end

#get_pixelsObject

#gray?Boolean

Returns:

  • (Boolean)

#grey?Boolean

Returns:

  • (Boolean)

#histogram?Boolean

Returns:

  • (Boolean)

#implodeObject

#import_pixelsObject

#initialize_copyObject

#inspectObject

#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.rb', line 868

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
        unless gamma_arg
            white_point = Magick::QuantumRange - black_point
        end
    end

    return level2(black_point, white_point, gamma)
end

#level2Object

#level_channelObject

#level_colorsObject

#levelize_channelObject

#linear_stretchObject

#liquid_rescaleObject

#magnifyObject

#magnify!Object

#mapObject

#maskObject

#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.rb', line 922

def matte_fill_to_border(x, y)
    f = copy
    f.opacity = Magick::OpaqueOpacity unless f.matte
    f.matte_flood_fill(border_color, TransparentOpacity,
                       x, y, FillToBorderMethod)
end

#matte_flood_fillObject

#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.rb', line 913

def matte_floodfill(x, y)
    f = copy
    f.opacity = OpaqueOpacity unless f.matte
    target = f.pixel_color(x, y)
    f.matte_flood_fill(target, TransparentOpacity,
                       x, y, FloodfillMethod)
end

#matte_point(x, y) ⇒ Object

Make the pixel at (x,y) transparent.


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# File 'lib/RMagick.rb', line 893

def matte_point(x, y)
    f = copy
    f.opacity = OpaqueOpacity unless f.matte
    pixel = f.pixel_color(x,y)
    pixel.opacity = TransparentOpacity
    f.pixel_color(x, y, pixel)
    return 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.rb', line 904

def matte_replace(x, y)
    f = copy
    f.opacity = OpaqueOpacity unless f.matte
    target = f.pixel_color(x, y)
    f.transparent(target)
end

#matte_reset!Object

Make all pixels transparent.


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# File 'lib/RMagick.rb', line 930

def matte_reset!
    self.opacity = Magick::TransparentOpacity
    self
end

#median_filterObject

#minifyObject

#minify!Object

#modulateObject

#monochrome?Boolean

Returns:

  • (Boolean)

#motion_blurObject

#negateObject

#negate_channelObject

#normalizeObject

#normalize_channelObject

#oil_paintObject

#opaqueObject

#opaque?Boolean

Returns:

  • (Boolean)

#opaque_channelObject

#ordered_ditherObject

#paint_transparentObject

#palette?Boolean

Returns:

  • (Boolean)

#pixel_colorObject

#polaroidObject

#posterizeObject

#previewObject

rb_define_method(Class_Image, “plasma”, Image_plasma, 6);

#profile!Object

#propertiesObject

#quantizeObject

#quantum_operatorObject

#radial_blurObject

#radial_blur_channelObject

#raiseObject

#random_threshold_channelObject

#recolorObject

#reduce_noiseObject

#resample(x_res = 72.0, y_res = nil) ⇒ Object

Corresponds to ImageMagick's -resample option


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# File 'lib/RMagick.rb', line 936

def resample(x_res=72.0, y_res=nil)
    y_res ||= x_res
    width = x_res * columns / x_resolution + 0.5
    height = y_res * rows / y_resolution + 0.5
    self.x_resolution = x_res
    self.y_resolution = y_res
    resize(width, height)
end

#resizeObject

#resize!Object

#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.rb', line 947

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.rb', line 951

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.rb', line 967

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.rb', line 974

def resize_to_fit!(cols, rows=nil)
    rows ||= cols
    change_geometry(Geometry.new(cols, rows)) do |ncols, nrows|
        resize!(ncols, nrows)
    end
end

#rollObject

#rotateObject

#rotate!Object

#sampleObject

#sample!Object

#scaleObject

#scale!Object

#segmentObject

#separateObject

#sepiatoneObject

#set_channel_depthObject

#shadeObject

#shadowObject

#sharpenObject

#sharpen_channelObject

#shaveObject

#shave!Object

#shearObject

#sigmoidal_contrast_channelObject

#signatureObject

#sketchObject

#solarizeObject

#sparse_colorObject

#spliceObject

#spreadObject

#steganoObject

#stereoObject

#store_pixelsObject

#strip!Object

#swirlObject

#sync_profilesObject

#texture_fill_to_border(x, y, texture) ⇒ Object

Replace neighboring pixels to border color with texture pixels


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# File 'lib/RMagick.rb', line 988

def texture_fill_to_border(x, y, texture)
    texture_flood_fill(border_color, texture, x, y, FillToBorderMethod)
end

#texture_flood_fillObject

#texture_floodfill(x, y, texture) ⇒ Object

Replace matching neighboring pixels with texture pixels


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# File 'lib/RMagick.rb', line 982

def texture_floodfill(x, y, texture)
    target = pixel_color(x, y)
    texture_flood_fill(target, texture, x, y, FloodfillMethod)
end

#thresholdObject

#thumbnailObject

#thumbnail!Object

#tintObject

#to_blobObject

#to_colorObject

#transparentObject

#transposeObject

#transpose!Object

#transverseObject

#transverse!Object

#trimObject

#trim!Object

#undefineObject

#unique_colorsObject

#unsharp_maskObject

#unsharp_mask_channelObject

#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.rb', line 994

def view(x, y, width, height)
    view = View.new(self, x, y, width, height)

    if block_given?
        begin
            yield(view)
        ensure
            view.sync
        end
        return nil
    else
        return view
    end
end

#vignetteObject

#watermarkObject

#waveObject

#wet_floorObject

#white_thresholdObject

#writeObject