Class: Vips::Image

Inherits:
Object show all
Defined in:
lib/vips/image.rb,
lib/vips/methods.rb

Overview

This class represents a libvips image. See the Vips module documentation for an introduction to using this class.

Defined Under Namespace

Modules: ImageLayout Classes: GenericPtr, ManagedStruct, Struct

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Object

#get_pspec, #get_typeof_error, print_all

Methods inherited from GObject::GObject

ffi_managed_struct, #ffi_managed_struct, #ffi_struct, ffi_struct, #initialize

Constructor Details

This class inherits a constructor from GObject::GObject

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args, **options) ⇒ Object

Invoke a vips operation with Operation.call, using self as the first input argument.


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# File 'lib/vips/image.rb', line 202

def method_missing name, *args, **options
  Vips::Operation.call name.to_s, [self, *args], options
end

Class Method Details

.analyzeload(filename, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load an analyze6 image.

Options Hash (**opts):

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 910


.arrayjoin(im, **opts) ⇒ Vips::Image

Join an array of images.

Options Hash (**opts):

  • :across (Integer)

    Number of images across grid

  • :shim (Integer)

    Pixels between images

  • :background (Array<Double>)

    Colour for new pixels

  • :halign (Vips::Align)

    Align on the left, centre or right

  • :valign (Vips::Align)

    Align on the top, centre or bottom

  • :hspacing (Integer)

    Horizontal spacing between images

  • :vspacing (Integer)

    Vertical spacing between images


# File 'lib/vips/methods.rb', line 362


.bandrank(im, **opts) ⇒ Vips::Image

Band-wise rank of a set of images.

Options Hash (**opts):

  • :index (Integer)

    Select this band element from sorted list


# File 'lib/vips/methods.rb', line 414


.black(width, height, **opts) ⇒ Vips::Image

Make a black image.

Options Hash (**opts):

  • :bands (Integer)

    Number of bands in image


# File 'lib/vips/methods.rb', line 570


.csvload(filename, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load csv from file.

Options Hash (**opts):

  • :skip (Integer)

    Skip this many lines at the start of the file

  • :lines (Integer)

    Read this many lines from the file

  • :whitespace (String)

    Set of whitespace characters

  • :separator (String)

    Set of separator characters

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 862


.eye(width, height, **opts) ⇒ Vips::Image

Make an image showing the eye's spatial response.

Options Hash (**opts):

  • :uchar (Boolean)

    Output an unsigned char image

  • :factor (Float)

    Maximum spatial frequency


# File 'lib/vips/methods.rb', line 630


.fitsload(filename, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load a fits image.

Options Hash (**opts):

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 1176


.fractsurf(width, height, fractal_dimension, **opts) ⇒ Vips::Image

Make a fractal surface.


# File 'lib/vips/methods.rb', line 837


.gaussmat(sigma, min_ampl, **opts) ⇒ Vips::Image

Make a gaussian image.

Options Hash (**opts):

  • :separable (Boolean)

    Generate separable Gaussian

  • :precision (Vips::Precision)

    Generate with this precision


# File 'lib/vips/methods.rb', line 612


.gaussnoise(width, height, **opts) ⇒ Vips::Image

Make a gaussnoise image.

Options Hash (**opts):

  • :sigma (Float)

    Standard deviation of pixels in generated image

  • :mean (Float)

    Mean of pixels in generated image


# File 'lib/vips/methods.rb', line 578


.gifload(filename, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load gif with giflib.

Options Hash (**opts):

  • :page (Integer)

    Load this page from the file

  • :n (Integer)

    Load this many pages

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 1006


.gifload_buffer(buffer, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load gif with giflib.

Options Hash (**opts):

  • :page (Integer)

    Load this page from the file

  • :n (Integer)

    Load this many pages

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 1018


.grey(width, height, **opts) ⇒ Vips::Image

Make a grey ramp image.

Options Hash (**opts):

  • :uchar (Boolean)

    Output an unsigned char image


# File 'lib/vips/methods.rb', line 639


.heifload(filename, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load a heif image.

Options Hash (**opts):

  • :page (Integer)

    Load this page from the file

  • :n (Integer)

    Load this many pages

  • :thumbnail (Boolean)

    Fetch thumbnail image

  • :autorotate (Boolean)

    Rotate image using exif orientation

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 1206


.heifload_buffer(buffer, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load a heif image.

Options Hash (**opts):

  • :page (Integer)

    Load this page from the file

  • :n (Integer)

    Load this many pages

  • :thumbnail (Boolean)

    Fetch thumbnail image

  • :autorotate (Boolean)

    Rotate image using exif orientation

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 1220


.identity(**opts) ⇒ Vips::Image

Make a 1d image where pixel values are indexes.

Options Hash (**opts):

  • :bands (Integer)

    Number of bands in LUT

  • :ushort (Boolean)

    Create a 16-bit LUT

  • :size (Integer)

    Size of 16-bit LUT


# File 'lib/vips/methods.rb', line 829


.jpegload(filename, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load jpeg from file.

Options Hash (**opts):

  • :shrink (Integer)

    Shrink factor on load

  • :autorotate (Boolean)

    Rotate image using exif orientation

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 1060


.jpegload_buffer(buffer, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load jpeg from buffer.

Options Hash (**opts):

  • :shrink (Integer)

    Shrink factor on load

  • :autorotate (Boolean)

    Rotate image using exif orientation

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 1072


.logmat(sigma, min_ampl, **opts) ⇒ Vips::Image

Make a laplacian of gaussian image.

Options Hash (**opts):

  • :separable (Boolean)

    Generate separable Logmatian

  • :precision (Vips::Precision)

    Generate with this precision


# File 'lib/vips/methods.rb', line 621


.magickload(filename, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load file with imagemagick.

Options Hash (**opts):

  • :density (String)

    Canvas resolution for rendering vector formats like SVG

  • :page (Integer)

    Load this page from the file

  • :n (Integer)

    Load this many pages

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 1150


.magickload_buffer(buffer, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load buffer with imagemagick.

Options Hash (**opts):

  • :density (String)

    Canvas resolution for rendering vector formats like SVG

  • :page (Integer)

    Load this page from the file

  • :n (Integer)

    Load this many pages

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 1163


.mask_butterworth(width, height, order, frequency_cutoff, amplitude_cutoff, **opts) ⇒ Vips::Image

Make a butterworth filter.

Options Hash (**opts):

  • :uchar (Boolean)

    Output an unsigned char image

  • :nodc (Boolean)

    Remove DC component

  • :reject (Boolean)

    Invert the sense of the filter

  • :optical (Boolean)

    Rotate quadrants to optical space


# File 'lib/vips/methods.rb', line 704


.mask_butterworth_band(width, height, order, frequency_cutoff_x, frequency_cutoff_y, radius, amplitude_cutoff, **opts) ⇒ Vips::Image

Make a butterworth_band filter.

Options Hash (**opts):

  • :uchar (Boolean)

    Output an unsigned char image

  • :nodc (Boolean)

    Remove DC component

  • :reject (Boolean)

    Invert the sense of the filter

  • :optical (Boolean)

    Rotate quadrants to optical space


# File 'lib/vips/methods.rb', line 733


.mask_butterworth_ring(width, height, order, frequency_cutoff, amplitude_cutoff, ringwidth, **opts) ⇒ Vips::Image

Make a butterworth ring filter.

Options Hash (**opts):

  • :uchar (Boolean)

    Output an unsigned char image

  • :nodc (Boolean)

    Remove DC component

  • :reject (Boolean)

    Invert the sense of the filter

  • :optical (Boolean)

    Rotate quadrants to optical space


# File 'lib/vips/methods.rb', line 718


.mask_fractal(width, height, fractal_dimension, **opts) ⇒ Vips::Image

Make fractal filter.

Options Hash (**opts):

  • :uchar (Boolean)

    Output an unsigned char image

  • :nodc (Boolean)

    Remove DC component

  • :reject (Boolean)

    Invert the sense of the filter

  • :optical (Boolean)

    Rotate quadrants to optical space


# File 'lib/vips/methods.rb', line 791


.mask_gaussian(width, height, frequency_cutoff, amplitude_cutoff, **opts) ⇒ Vips::Image

Make a gaussian filter.

Options Hash (**opts):

  • :uchar (Boolean)

    Output an unsigned char image

  • :nodc (Boolean)

    Remove DC component

  • :reject (Boolean)

    Invert the sense of the filter

  • :optical (Boolean)

    Rotate quadrants to optical space


# File 'lib/vips/methods.rb', line 749


.mask_gaussian_band(width, height, frequency_cutoff_x, frequency_cutoff_y, radius, amplitude_cutoff, **opts) ⇒ Vips::Image

Make a gaussian filter.

Options Hash (**opts):

  • :uchar (Boolean)

    Output an unsigned char image

  • :nodc (Boolean)

    Remove DC component

  • :reject (Boolean)

    Invert the sense of the filter

  • :optical (Boolean)

    Rotate quadrants to optical space


# File 'lib/vips/methods.rb', line 776


.mask_gaussian_ring(width, height, frequency_cutoff, amplitude_cutoff, ringwidth, **opts) ⇒ Vips::Image

Make a gaussian ring filter.

Options Hash (**opts):

  • :uchar (Boolean)

    Output an unsigned char image

  • :nodc (Boolean)

    Remove DC component

  • :reject (Boolean)

    Invert the sense of the filter

  • :optical (Boolean)

    Rotate quadrants to optical space


# File 'lib/vips/methods.rb', line 762


.mask_ideal(width, height, frequency_cutoff, **opts) ⇒ Vips::Image

Make an ideal filter.

Options Hash (**opts):

  • :uchar (Boolean)

    Output an unsigned char image

  • :nodc (Boolean)

    Remove DC component

  • :reject (Boolean)

    Invert the sense of the filter

  • :optical (Boolean)

    Rotate quadrants to optical space


# File 'lib/vips/methods.rb', line 665


.mask_ideal_band(width, height, frequency_cutoff_x, frequency_cutoff_y, radius, **opts) ⇒ Vips::Image

Make an ideal band filter.

Options Hash (**opts):

  • :uchar (Boolean)

    Output an unsigned char image

  • :nodc (Boolean)

    Remove DC component

  • :reject (Boolean)

    Invert the sense of the filter

  • :optical (Boolean)

    Rotate quadrants to optical space


# File 'lib/vips/methods.rb', line 690


.mask_ideal_ring(width, height, frequency_cutoff, ringwidth, **opts) ⇒ Vips::Image

Make an ideal ring filter.

Options Hash (**opts):

  • :uchar (Boolean)

    Output an unsigned char image

  • :nodc (Boolean)

    Remove DC component

  • :reject (Boolean)

    Invert the sense of the filter

  • :optical (Boolean)

    Rotate quadrants to optical space


# File 'lib/vips/methods.rb', line 677


.matload(filename, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load mat from file.

Options Hash (**opts):

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 1050


.matrix_from_array(width, height, array) ⇒ Object


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# File 'lib/vips/image.rb', line 298

def self.matrix_from_array width, height, array
  ptr = FFI::MemoryPointer.new :double, array.length
  ptr.write_array_of_double array
  image = Vips::vips_image_new_matrix_from_array width, height,
      ptr, array.length
  Vips::Image.new image
end

.matrixload(filename, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load matrix from file.

Options Hash (**opts):

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 876


.method_missing(name, *args, **options) ⇒ Object

Invoke a vips operation with Operation.call.


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# File 'lib/vips/image.rb', line 207

def self.method_missing name, *args, **options
  Vips::Operation.call name.to_s, args, options
end

.new_from_array(array, scale = 1, offset = 0) ⇒ Image

Create a new Image from a 1D or 2D array. A 1D array becomes an image with height 1. Use scale and offset to set the scale and offset fields in the header. These are useful for integer convolutions.

For example:

image = Vips::Image.new_from_array [1, 2, 3]

or

image = Vips::Image.new_from_array [
    [-1, -1, -1],
    [-1, 16, -1],
    [-1, -1, -1]], 8

for a simple sharpening mask.

Raises:


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# File 'lib/vips/image.rb', line 332

def self.new_from_array array, scale = 1, offset = 0
  # we accept a 1D array and assume height == 1, or a 2D array
  # and check all lines are the same length
  unless array.is_a? Array
    raise Vips::Error, "Argument is not an array."
  end

  if array[0].is_a? Array
    height = array.length
    width = array[0].length
    unless array.all? { |x| x.is_a? Array }
      raise Vips::Error, "Not a 2D array."
    end
    unless array.all? { |x| x.length == width }
      raise Vips::Error, "Array not rectangular."
    end

    array = array.flatten
  else
    height = 1
    width = array.length
  end

  unless array.all? { |x| x.is_a? Numeric }
    raise Vips::Error, "Not all array elements are Numeric."
  end

  image = Vips::Image.matrix_from_array width, height, array
  raise Vips::Error if image == nil

  # be careful to set them as double
  image.set_type GObject::GDOUBLE_TYPE, 'scale', scale.to_f
  image.set_type GObject::GDOUBLE_TYPE, 'offset', offset.to_f

  return image
end

.new_from_buffer(data, option_string, **opts) ⇒ Image

Create a new Vips::Image for an image encoded, in a format such as JPEG, in a binary string. Load options may be passed as strings or appended as a hash. For example:

image = Vips::Image.new_from_buffer memory_buffer, "shrink=2"

or alternatively:

image = Vips::Image.new_from_buffer memory_buffer, "", shrink: 2

The options available depend on the file format. Try something like:

$ vips jpegload_buffer

at the command-line to see the available options. Not all loaders support load from buffer, but at least JPEG, PNG and TIFF images will work.

Loading is fast: only enough of the image is loaded to be able to fill out the header. Pixels will only be decompressed when they are needed.

Options Hash (**opts):

  • :disc (Boolean) — default: true

    Open large images via a temporary disc file

  • :access (Vips::Access) — default: :random

    Access mode for file

Raises:


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# File 'lib/vips/image.rb', line 291

def self.new_from_buffer data, option_string, **opts
  loader = Vips::vips_foreign_find_load_buffer data, data.bytesize
  raise Vips::Error if loader == nil

  Vips::Operation.call loader, [data], opts, option_string
end

.new_from_file(name, **opts) ⇒ Image

Return a new Vips::Image for a file on disc. This method can load images in any format supported by vips. The filename can include load options, for example:

image = Vips::Image.new_from_file "fred.jpg[shrink=2]"

You can also supply options as a hash, for example:

image = Vips::Image.new_from_file "fred.jpg", shrink: 2

The full set of options available depend upon the load operation that will be executed. Try something like:

$ vips jpegload

at the command-line to see a summary of the available options for the JPEG loader.

Loading is fast: only enough of the image is loaded to be able to fill out the header. Pixels will only be decompressed when they are needed.

Options Hash (**opts):

  • :disc (Boolean) — default: true

    Open large images via a temporary disc file

  • :access (Vips::Access) — default: :random

    Access mode for file

Raises:


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# File 'lib/vips/image.rb', line 247

def self.new_from_file name, **opts
  # very common, and Vips::vips_filename_get_filename will segv if we
  # pass this
  raise Vips::Error, "filename is nil" if name == nil

  filename = Vips::p2str(Vips::vips_filename_get_filename name)
  option_string = Vips::p2str(Vips::vips_filename_get_options name)
  loader = Vips::vips_foreign_find_load filename
  raise Vips::Error if loader == nil

  Operation.call loader, [filename], opts, option_string
end

.niftiload(filename, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load a nifti image.

Options Hash (**opts):

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 1196


.openexrload(filename, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load an openexr image.

Options Hash (**opts):

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 1186


.openslideload(filename, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load file with openslide.

Options Hash (**opts):

  • :attach_associated (Boolean)

    Attach all asssociated images

  • :level (Integer)

    Load this level from the file

  • :autocrop (Boolean)

    Crop to image bounds

  • :associated (String)

    Load this associated image

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 1136


.pdfload(filename, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load pdf with libpoppler.

Options Hash (**opts):

  • :page (Integer)

    Load this page from the file

  • :n (Integer)

    Load this many pages

  • :dpi (Float)

    Render at this DPI

  • :scale (Float)

    Scale output by this factor

  • :background (Array<Double>)

    Background value

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 940


.pdfload_buffer(buffer, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load pdf with libpoppler.

Options Hash (**opts):

  • :page (Integer)

    Load this page from the file

  • :n (Integer)

    Load this many pages

  • :dpi (Float)

    Render at this DPI

  • :scale (Float)

    Scale output by this factor

  • :background (Array<Double>)

    Background value

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 955


.perlin(width, height, **opts) ⇒ Vips::Image

Make a perlin noise image.

Options Hash (**opts):

  • :cell_size (Integer)

    Size of Perlin cells

  • :uchar (Boolean)

    Output an unsigned char image


# File 'lib/vips/methods.rb', line 853


.pngload(filename, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load png from file.

Options Hash (**opts):

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 1030


.pngload_buffer(buffer, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load png from buffer.

Options Hash (**opts):

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 1040


.ppmload(filename, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load ppm from file.

Options Hash (**opts):

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 920


.profile_load(name, **opts) ⇒ VipsBlob

Load named icc profile.


# File 'lib/vips/methods.rb', line 1939


.radload(filename, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load a radiance image from a file.

Options Hash (**opts):

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 930


.rawload(filename, width, height, bands, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load raw data from a file.

Options Hash (**opts):

  • :offset (guint64)

    Offset in bytes from start of file

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 886


.respond_to?(name, include_all = false) ⇒ Boolean


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# File 'lib/vips/image.rb', line 190

def self.respond_to? name, include_all = false
  # respond to all vips operations by nickname
  return true if Vips::type_find("VipsOperation", name.to_s) != 0

  super
end

.sines(width, height, **opts) ⇒ Vips::Image

Make a 2d sine wave.

Options Hash (**opts):

  • :uchar (Boolean)

    Output an unsigned char image

  • :hfreq (Float)

    Horizontal spatial frequency

  • :vfreq (Float)

    Vertical spatial frequency


# File 'lib/vips/methods.rb', line 655


.sum(im, **opts) ⇒ Vips::Image

Sum an array of images.


# File 'lib/vips/methods.rb', line 79


.svgload(filename, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load svg with rsvg.

Options Hash (**opts):

  • :dpi (Float)

    Render at this DPI

  • :scale (Float)

    Scale output by this factor

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 970


.svgload_buffer(buffer, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load svg with rsvg.

Options Hash (**opts):

  • :dpi (Float)

    Render at this DPI

  • :scale (Float)

    Scale output by this factor

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 994


.system(cmd_format, **opts) ⇒ nil, Hash<Symbol => Object>

Run an external command.

Options Hash (**opts):

  • :im (Array<Image>)

    Array of input images

  • :out_format (String)

    Format for output filename

  • :in_format (String)

    Format for input filename

  • :out (Vips::Image)

    Output Output image

  • :log (String)

    Output Command log


# File 'lib/vips/methods.rb', line 4


.text(text, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Make a text image.

Options Hash (**opts):

  • :font (String)

    Font to render with

  • :width (Integer)

    Maximum image width in pixels

  • :height (Integer)

    Maximum image height in pixels

  • :align (Vips::Align)

    Align on the low, centre or high edge

  • :dpi (Integer)

    DPI to render at

  • :justify (Boolean)

    Justify lines

  • :spacing (Integer)

    Line spacing

  • :fontfile (String)

    Load this font file

  • :autofit_dpi (Integer)

    Output DPI selected by autofit


# File 'lib/vips/methods.rb', line 587


.thumbnail(filename, width, **opts) ⇒ Vips::Image

Generate thumbnail from file.

Options Hash (**opts):

  • :height (Integer)

    Size to this height

  • :size (Vips::Size)

    Only upsize, only downsize, or both

  • :no_rotate (Boolean)

    Don't use orientation tags to rotate image upright

  • :crop (Vips::Interesting)

    Reduce to fill target rectangle, then crop

  • :linear (Boolean)

    Reduce in linear light

  • :import_profile (String)

    Fallback import profile

  • :export_profile (String)

    Fallback export profile

  • :intent (Vips::Intent)

    Rendering intent


# File 'lib/vips/methods.rb', line 1601


.thumbnail_buffer(buffer, width, **opts) ⇒ Vips::Image

Generate thumbnail from buffer.

Options Hash (**opts):

  • :option_string (String)

    Options that are passed on to the underlying loader

  • :height (Integer)

    Size to this height

  • :size (Vips::Size)

    Only upsize, only downsize, or both

  • :no_rotate (Boolean)

    Don't use orientation tags to rotate image upright

  • :crop (Vips::Interesting)

    Reduce to fill target rectangle, then crop

  • :linear (Boolean)

    Reduce in linear light

  • :import_profile (String)

    Fallback import profile

  • :export_profile (String)

    Fallback export profile

  • :intent (Vips::Intent)

    Rendering intent


# File 'lib/vips/methods.rb', line 1616


.tiffload(filename, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load tiff from file.

Options Hash (**opts):

  • :page (Integer)

    Load this page from the image

  • :n (Integer)

    Load this many pages

  • :autorotate (Boolean)

    Rotate image using orientation tag

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 1110


.tiffload_buffer(buffer, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load tiff from buffer.

Options Hash (**opts):

  • :page (Integer)

    Load this page from the image

  • :n (Integer)

    Load this many pages

  • :autorotate (Boolean)

    Rotate image using orientation tag

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 1123


.tonelut(**opts) ⇒ Vips::Image

Build a look-up table.

Options Hash (**opts):

  • :in_max (Integer)

    Size of LUT to build

  • :out_max (Integer)

    Maximum value in output LUT

  • :Lb (Float)

    Lowest value in output

  • :Lw (Float)

    Highest value in output

  • :Ps (Float)

    Position of shadow

  • :Pm (Float)

    Position of mid-tones

  • :Ph (Float)

    Position of highlights

  • :S (Float)

    Adjust shadows by this much

  • :M (Float)

    Adjust mid-tones by this much

  • :H (Float)

    Adjust highlights by this much


# File 'lib/vips/methods.rb', line 814


.vipsload(filename, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load vips from file.

Options Hash (**opts):

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 900


.webpload(filename, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load webp from file.

Options Hash (**opts):

  • :page (Integer)

    Load this page from the file

  • :n (Integer)

    Load this many pages

  • :scale (Float)

    Scale factor on load

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 1084


.webpload_buffer(buffer, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Load webp from buffer.

Options Hash (**opts):

  • :page (Integer)

    Load this page from the file

  • :n (Integer)

    Load this many pages

  • :scale (Float)

    Scale factor on load

  • :memory (Boolean)

    Force open via memory

  • :access (Vips::Access)

    Required access pattern for this file

  • :fail (Boolean)

    Fail on first error

  • :flags (Vips::ForeignFlags)

    Output Flags for this file


# File 'lib/vips/methods.rb', line 1097


.worley(width, height, **opts) ⇒ Vips::Image

Make a worley noise image.

Options Hash (**opts):

  • :cell_size (Integer)

    Size of Worley cells


# File 'lib/vips/methods.rb', line 845


.xyz(width, height, **opts) ⇒ Vips::Image

Make an image where pixel values are coordinates.

Options Hash (**opts):

  • :csize (Integer)

    Size of third dimension

  • :dsize (Integer)

    Size of fourth dimension

  • :esize (Integer)

    Size of fifth dimension


# File 'lib/vips/methods.rb', line 602


.zone(width, height, **opts) ⇒ Vips::Image

Make a zone plate.

Options Hash (**opts):

  • :uchar (Boolean)

    Output an unsigned char image


# File 'lib/vips/methods.rb', line 647


Instance Method Details

#!Image

Equivalent to image ^ -1


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# File 'lib/vips/image.rb', line 848

def !
  self ^ -1
end

#!=(other) ⇒ Image

Compare inequality to nil, an image, constant or array.


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# File 'lib/vips/image.rb', line 922

def != other
  # for equality, we must allow tests against nil
  if other == nil
    true
  else
    call_enum "relational", other, :noteq
  end
end

#%(other) ⇒ Image

Remainder after integer division with an image, constant or array.


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# File 'lib/vips/image.rb', line 792

def % other
  other.is_a?(Vips::Image) ?
      remainder(other) : remainder_const(other)
end

#&(other) ⇒ Image

Integer bitwise AND with an image, constant or array.


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# File 'lib/vips/image.rb', line 833

def & other
  call_enum "boolean", other, :and
end

#*(other) ⇒ Image

Multiply an image, constant or array.


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# File 'lib/vips/image.rb', line 774

def * other
  other.is_a?(Vips::Image) ?
      multiply(other) : linear(other, 0)
end

#**(other) ⇒ Image

Raise to power of an image, constant or array.


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# File 'lib/vips/image.rb', line 801

def ** other
  call_enum "math2", other, :pow
end

#+(other) ⇒ Image

Add an image, constant or array.


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# File 'lib/vips/image.rb', line 756

def + other
  other.is_a?(Vips::Image) ?
      add(other) : linear(1, other)
end

#[email protected]Image


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# File 'lib/vips/image.rb', line 860

def [email protected]
  self
end

#-(other) ⇒ Image

Subtract an image, constant or array.


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# File 'lib/vips/image.rb', line 765

def - other
  other.is_a?(Vips::Image) ?
      subtract(other) : linear(1, Image::smap(other) { |x| x * -1 })
end

#[email protected]Image

Equivalent to image * -1


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# File 'lib/vips/image.rb', line 867

def [email protected]
  self * -1
end

#/(other) ⇒ Image

Divide an image, constant or array.


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# File 'lib/vips/image.rb', line 783

def / other
  other.is_a?(Vips::Image) ?
      divide(other) : linear(Image::smap(other) { |x| 1.0 / x }, 0)
end

#<(other) ⇒ Image

Relational less than with an image, constant or array.


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# File 'lib/vips/image.rb', line 875

def < other
  call_enum "relational", other, :less
end

#<<(other) ⇒ Image

Integer left shift with an image, constant or array.


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# File 'lib/vips/image.rb', line 809

def << other
  call_enum "boolean", other, :lshift
end

#<=(other) ⇒ Image

Relational less than or equal to with an image, constant or array.


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# File 'lib/vips/image.rb', line 884

def <= other
  call_enum "relational", other, :lesseq
end

#==(other) ⇒ Image

Compare equality to nil, an image, constant or array.


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# File 'lib/vips/image.rb', line 909

def == other
  # for equality, we must allow tests against nil
  if other == nil
    false
  else
    call_enum "relational", other, :equal
  end
end

#>(other) ⇒ Image

Relational more than with an image, constant or array.


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# File 'lib/vips/image.rb', line 892

def > other
  call_enum "relational", other, :more
end

#>=(other) ⇒ Image

Relational more than or equal to with an image, constant or array.


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# File 'lib/vips/image.rb', line 901

def >= other
  call_enum "relational", other, :moreeq
end

#>>(other) ⇒ Image

Integer right shift with an image, constant or array.


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# File 'lib/vips/image.rb', line 817

def >> other
  call_enum "boolean", other, :rshift
end

#[](index) ⇒ Image

Fetch bands using a number or a range


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# File 'lib/vips/image.rb', line 935

def [] index
  if index.is_a? Range
    n = index.size
    extract_band index.begin, n: n
  elsif index.is_a? Numeric
    extract_band index
  else
    raise Vips::Error, "[] index is not range or numeric."
  end
end

#^(other) ⇒ Image

Integer bitwise EOR with an image, constant or array.


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# File 'lib/vips/image.rb', line 841

def ^ other
  call_enum "boolean", other, :eor
end

#abs(**opts) ⇒ Vips::Image

Absolute value of an image.


# File 'lib/vips/methods.rb', line 104


#acosImage

Return the inverse cosine of an image in degrees.


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# File 'lib/vips/image.rb', line 1192

def acos
  math :acos
end

#add(right, **opts) ⇒ Vips::Image

Add two images.


# File 'lib/vips/methods.rb', line 15


#add_alphaImage

Append an alpha channel to an image.

Raises:


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# File 'lib/vips/image.rb', line 722

def add_alpha
  ptr = GenericPtr.new
  result = Vips::vips_addalpha self, ptr
  raise Vips::Error if result != 0

  Vips::Image.new ptr[:value]
end

#affine(matrix, **opts) ⇒ Vips::Image

Affine transform of an image.

Options Hash (**opts):

  • :interpolate (Vips::Interpolate)

    Interpolate pixels with this

  • :oarea (Array<Integer>)

    Area of output to generate

  • :odx (Float)

    Horizontal output displacement

  • :ody (Float)

    Vertical output displacement

  • :idx (Float)

    Horizontal input displacement

  • :idy (Float)

    Vertical input displacement

  • :background (Array<Double>)

    Background value

  • :extend (Vips::Extend)

    How to generate the extra pixels


# File 'lib/vips/methods.rb', line 1704


#asinImage

Return the inverse sine of an image in degrees.


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# File 'lib/vips/image.rb', line 1185

def asin
  math :asin
end

#atanImage

Return the inverse tangent of an image in degrees.


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# File 'lib/vips/image.rb', line 1199

def atan
  math :atan
end

#autorot(**opts) ⇒ Vips::Image, Hash<Symbol => Object>

Autorotate image by exif tag.

Options Hash (**opts):

  • :angle (Vips::Angle)

    Output Angle image was rotated by


# File 'lib/vips/methods.rb', line 458


#avg(**opts) ⇒ Float

Find image average.


# File 'lib/vips/methods.rb', line 159


#bandandImage

AND the bands of an image together


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# File 'lib/vips/image.rb', line 1004

def bandand
  bandbool :and
end

#bandbool(boolean, **opts) ⇒ Vips::Image

Boolean operation across image bands.


# File 'lib/vips/methods.rb', line 426


#bandeorImage

EOR the bands of an image together


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# File 'lib/vips/image.rb', line 1018

def bandeor
  bandbool :eor
end

#bandfold(**opts) ⇒ Vips::Image

Fold up x axis into bands.

Options Hash (**opts):

  • :factor (Integer)

    Fold by this factor


# File 'lib/vips/methods.rb', line 470


#bandjoin(other) ⇒ Image

Join a set of images bandwise.


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# File 'lib/vips/image.rb', line 1033

def bandjoin other
  unless other.is_a? Array
    other = [other]
  end

  # if other is just Numeric, we can use bandjoin_const
  not_all_real = !other.all? { |x| x.is_a? Numeric }

  if not_all_real
    Vips::Image.bandjoin([self] + other)
  else
    bandjoin_const other
  end
end

#bandjoin_const(c, **opts) ⇒ Vips::Image

Append a constant band to an image.


# File 'lib/vips/methods.rb', line 408


#bandmean(**opts) ⇒ Vips::Image

Band-wise average.


# File 'lib/vips/methods.rb', line 421


#bandorImage

OR the bands of an image together


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# File 'lib/vips/image.rb', line 1011

def bandor
  bandbool :or
end

#bandsInteger

Get number of image bands.


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# File 'lib/vips/image.rb', line 623

def bands
  get "bands"
end

#bandsplitArray<Image>

Split an n-band image into n separate images.


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# File 'lib/vips/image.rb', line 1025

def bandsplit
  (0...bands).map { |i| extract_band i }
end

#bandunfold(**opts) ⇒ Vips::Image

Unfold image bands into x axis.

Options Hash (**opts):

  • :factor (Integer)

    Unfold by this factor


# File 'lib/vips/methods.rb', line 476


#boolean(right, boolean, **opts) ⇒ Vips::Image

Boolean operation on two images.


# File 'lib/vips/methods.rb', line 52


#boolean_const(boolean, c, **opts) ⇒ Vips::Image

Boolean operations against a constant.


# File 'lib/vips/methods.rb', line 133


#buildlut(**opts) ⇒ Vips::Image

Build a look-up table.


# File 'lib/vips/methods.rb', line 803


#byteswap(**opts) ⇒ Vips::Image

Byteswap an image.


# File 'lib/vips/methods.rb', line 543


#cache(**opts) ⇒ Vips::Image

Cache an image.

Options Hash (**opts):

  • :max_tiles (Integer)

    Maximum number of tiles to cache

  • :tile_height (Integer)

    Tile height in pixels

  • :tile_width (Integer)

    Tile width in pixels


# File 'lib/vips/methods.rb', line 306


#canny(**opts) ⇒ Vips::Image

Canny edge detector.

Options Hash (**opts):

  • :sigma (Float)

    Sigma of Gaussian

  • :precision (Vips::Precision)

    Convolve with this precision


# File 'lib/vips/methods.rb', line 2102


#cast(format, **opts) ⇒ Vips::Image

Cast an image.

Options Hash (**opts):

  • :shift (Boolean)

    Shift integer values up and down


# File 'lib/vips/methods.rb', line 439


#ceilImage

Return the smallest integral value not less than the argument.


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# File 'lib/vips/image.rb', line 990

def ceil
  round :ceil
end

#CMC2LCh(**opts) ⇒ Vips::Image

Transform lch to cmc.


# File 'lib/vips/methods.rb', line 1785


#CMYK2XYZ(**opts) ⇒ Vips::Image

Transform cmyk to xyz.


# File 'lib/vips/methods.rb', line 1929


#codingSymbol

Get image coding.


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# File 'lib/vips/image.rb', line 644

def coding
  get "coding"
end

#colourspace(space, **opts) ⇒ Vips::Image

Convert to a new colorspace.

Options Hash (**opts):


# File 'lib/vips/methods.rb', line 1751


#compass(mask, **opts) ⇒ Vips::Image

Convolve with rotating mask.

Options Hash (**opts):

  • :times (Integer)

    Rotate and convolve this many times

  • :angle (Vips::Angle45)

    Rotate mask by this much between convolutions

  • :combine (Vips::Combine)

    Combine convolution results like this

  • :precision (Vips::Precision)

    Convolve with this precision

  • :layers (Integer)

    Use this many layers in approximation

  • :cluster (Integer)

    Cluster lines closer than this in approximation


# File 'lib/vips/methods.rb', line 2043


#complex(cmplx, **opts) ⇒ Vips::Image

Perform a complex operation on an image.


# File 'lib/vips/methods.rb', line 147


#complex2(right, cmplx, **opts) ⇒ Vips::Image

Complex binary operations on two images.


# File 'lib/vips/methods.rb', line 66


#complexform(right, **opts) ⇒ Vips::Image

Form a complex image from two real images.


# File 'lib/vips/methods.rb', line 73


#complexget(get, **opts) ⇒ Vips::Image

Get a component from a complex image.


# File 'lib/vips/methods.rb', line 153


#composite(overlay, mode, **opts) ⇒ Image

Composite a set of images with a set of blend modes.

Options Hash (**opts):

  • :compositing_space (Vips::Interpretation)

    Composite images in this colour space

  • :premultiplied (Boolean)

    Images have premultiplied alpha


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# File 'lib/vips/image.rb', line 1056

def composite overlay, mode, **opts
  unless overlay.is_a? Array
    overlay = [overlay]
  end
  unless mode.is_a? Array
    mode = [mode]
  end

  mode = mode.map do |x|
    GObject::GValue.from_nick Vips::BLEND_MODE_TYPE, x
  end

  Vips::Image.composite([self] + overlay, mode, opts)
end

#composite2(overlay, mode, **opts) ⇒ Vips::Image

Blend a pair of images with a blend mode.

Options Hash (**opts):

  • :x (Integer)

    x position of overlay

  • :y (Integer)

    y position of overlay

  • :compositing_space (Vips::Interpretation)

    Composite images in this colour space

  • :premultiplied (Boolean)

    Images have premultiplied alpha


# File 'lib/vips/methods.rb', line 559


#conjImage

Return the complex conjugate of an image.

The image can be complex, in which case the return image will also be complex, or must have an even number of bands, in which case pairs of bands are treated as (x, y) coordinates.


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# File 'lib/vips/image.rb', line 1149

def conj
  Image::run_cmplx(self) { |x| x.complex :conj }
end

#conv(mask, **opts) ⇒ Vips::Image

Convolution operation.

Options Hash (**opts):

  • :precision (Vips::Precision)

    Convolve with this precision

  • :layers (Integer)

    Use this many layers in approximation

  • :cluster (Integer)

    Cluster lines closer than this in approximation


# File 'lib/vips/methods.rb', line 2014


#conva(mask, **opts) ⇒ Vips::Image

Approximate integer convolution.

Options Hash (**opts):

  • :layers (Integer)

    Use this many layers in approximation

  • :cluster (Integer)

    Cluster lines closer than this in approximation


# File 'lib/vips/methods.rb', line 2023


#convasep(mask, **opts) ⇒ Vips::Image

Approximate separable integer convolution.

Options Hash (**opts):

  • :layers (Integer)

    Use this many layers in approximation


# File 'lib/vips/methods.rb', line 2064


#convf(mask, **opts) ⇒ Vips::Image

Float convolution operation.


# File 'lib/vips/methods.rb', line 2031


#convi(mask, **opts) ⇒ Vips::Image

Int convolution operation.


# File 'lib/vips/methods.rb', line 2037


#convsep(mask, **opts) ⇒ Vips::Image

Seperable convolution operation.

Options Hash (**opts):

  • :precision (Vips::Precision)

    Convolve with this precision

  • :layers (Integer)

    Use this many layers in approximation

  • :cluster (Integer)

    Cluster lines closer than this in approximation


# File 'lib/vips/methods.rb', line 2055


#copy(**opts) ⇒ Vips::Image

Copy an image.

Options Hash (**opts):

  • :width (Integer)

    Image width in pixels

  • :height (Integer)

    Image height in pixels

  • :bands (Integer)

    Number of bands in image

  • :format (Vips::BandFormat)

    Pixel format in image

  • :coding (Vips::Coding)

    Pixel coding

  • :interpretation (Vips::Interpretation)

    Pixel interpretation

  • :xres (Float)

    Horizontal resolution in pixels/mm

  • :yres (Float)

    Vertical resolution in pixels/mm

  • :xoffset (Integer)

    Horizontal offset of origin

  • :yoffset (Integer)

    Vertical offset of origin


# File 'lib/vips/methods.rb', line 265


#copy_memoryImage

Copy an image to a memory area.

This can be useful for reusing results, but can obviously use a lot of memory for large images. See #tilecache for a way of caching parts of an image.


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# File 'lib/vips/image.rb', line 738

def copy_memory
  new_image = Vips::vips_image_copy_memory self
  Vips::Image.new new_image
end

#cosImage

Return the cosine of an image in degrees.


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# File 'lib/vips/image.rb', line 1171

def cos
  math :cos
end

#countlines(direction, **opts) ⇒ Float

Count lines in an image.


# File 'lib/vips/methods.rb', line 2157


#cross_phase(other) ⇒ Image

Calculate the cross phase of two images.


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# File 'lib/vips/image.rb', line 1157

def cross_phase other
  complex2 other, :cross_phase
end

#csvsave(filename, **opts) ⇒ nil

Save image to csv file.

Options Hash (**opts):

  • :page_height (Integer)

    Set page height for multipage save

  • :separator (String)

    Separator characters

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1234


#dE00(right, **opts) ⇒ Vips::Image

Calculate de00.


# File 'lib/vips/methods.rb', line 1900


#dE76(right, **opts) ⇒ Vips::Image

Calculate de76.


# File 'lib/vips/methods.rb', line 1894


#dECMC(right, **opts) ⇒ Vips::Image

Calculate decmc.


# File 'lib/vips/methods.rb', line 1906


#deviate(**opts) ⇒ Float

Find image standard deviation.


# File 'lib/vips/methods.rb', line 186


#dilate(mask) ⇒ Image

Dilate with a structuring element.

The structuring element must be an array with 0 for black, 255 for white and 128 for don't care.


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# File 'lib/vips/image.rb', line 1265

def dilate mask
  morph mask, :dilate
end

#divide(right, **opts) ⇒ Vips::Image

Divide two images.


# File 'lib/vips/methods.rb', line 33


#draw_circle(ink, cx, cy, radius, **opts) ⇒ Vips::Image

Draw a circle on an image.

Options Hash (**opts):

  • :fill (Boolean)

    Draw a solid object


# File 'lib/vips/methods.rb', line 2205


#draw_flood(ink, x, y, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Flood-fill an area.

Options Hash (**opts):

  • :test (Vips::Image)

    Test pixels in this image

  • :equal (Boolean)

    DrawFlood while equal to edge

  • :left (Integer)

    Output Left edge of modified area

  • :top (Integer)

    Output top edge of modified area

  • :width (Integer)

    Output width of modified area

  • :height (Integer)

    Output height of modified area


# File 'lib/vips/methods.rb', line 2215


#draw_image(sub, x, y, **opts) ⇒ Vips::Image

Paint an image into another image.

Options Hash (**opts):

  • :mode (Vips::CombineMode)

    Combining mode


# File 'lib/vips/methods.rb', line 2229


#draw_line(ink, x1, y1, x2, y2, **opts) ⇒ Vips::Image

Draw a line on an image.


# File 'lib/vips/methods.rb', line 2195


#draw_mask(ink, mask, x, y, **opts) ⇒ Vips::Image

Draw a mask on an image.


# File 'lib/vips/methods.rb', line 2186


#draw_point(ink, left, top, **opts) ⇒ Image

Draw a point on an image.

See #draw_rect.


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# File 'lib/vips/image.rb', line 748

def draw_point ink, left, top, **opts
  draw_rect ink, left, top, 1, 1, opts
end

#draw_rect(ink, left, top, width, height, **opts) ⇒ Vips::Image

Paint a rectangle on an image.

Options Hash (**opts):

  • :fill (Boolean)

    Draw a solid object


# File 'lib/vips/methods.rb', line 2175


#draw_smudge(left, top, width, height, **opts) ⇒ Vips::Image

Blur a rectangle on an image.


# File 'lib/vips/methods.rb', line 2238


#dzsave(filename, **opts) ⇒ nil

Save image to deepzoom file.

Options Hash (**opts):

  • :basename (String)

    Base name to save to

  • :layout (Vips::ForeignDzLayout)

    Directory layout

  • :page_height (Integer)

    Set page height for multipage save

  • :suffix (String)

    Filename suffix for tiles

  • :overlap (Integer)

    Tile overlap in pixels

  • :tile_size (Integer)

    Tile size in pixels

  • :centre (Boolean)

    Center image in tile

  • :depth (Vips::ForeignDzDepth)

    Pyramid depth

  • :angle (Vips::Angle)

    Rotate image during save

  • :container (Vips::ForeignDzContainer)

    Pyramid container type

  • :properties (Boolean)

    Write a properties file to the output directory

  • :compression (Integer)

    ZIP deflate compression level

  • :region_shrink (Vips::RegionShrink)

    Method to shrink regions

  • :skip_blanks (Integer)

    Skip tiles which are nearly equal to the background

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1316


#dzsave_buffer(**opts) ⇒ VipsBlob

Save image to dz buffer.

Options Hash (**opts):

  • :basename (String)

    Base name to save to

  • :layout (Vips::ForeignDzLayout)

    Directory layout

  • :page_height (Integer)

    Set page height for multipage save

  • :suffix (String)

    Filename suffix for tiles

  • :overlap (Integer)

    Tile overlap in pixels

  • :tile_size (Integer)

    Tile size in pixels

  • :centre (Boolean)

    Center image in tile

  • :depth (Vips::ForeignDzDepth)

    Pyramid depth

  • :angle (Vips::Angle)

    Rotate image during save

  • :container (Vips::ForeignDzContainer)

    Pyramid container type

  • :properties (Boolean)

    Write a properties file to the output directory

  • :compression (Integer)

    ZIP deflate compression level

  • :region_shrink (Vips::RegionShrink)

    Method to shrink regions

  • :skip_blanks (Integer)

    Skip tiles which are nearly equal to the background

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1338


#embed(x, y, width, height, **opts) ⇒ Vips::Image

Embed an image in a larger image.

Options Hash (**opts):

  • :extend (Vips::Extend)

    How to generate the extra pixels

  • :background (Array<Double>)

    Color for background pixels


# File 'lib/vips/methods.rb', line 314


#erode(mask) ⇒ Image

Erode with a structuring element.

The structuring element must be an array with 0 for black, 255 for white and 128 for don't care.


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# File 'lib/vips/image.rb', line 1253

def erode mask
  morph mask, :erode
end

#expImage

Return e ** pixel.


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# File 'lib/vips/image.rb', line 1220

def exp
  math :exp
end

#exp10Image

Return 10 ** pixel.


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# File 'lib/vips/image.rb', line 1227

def exp10
  math :exp10
end

#extract_area(left, top, width, height, **opts) ⇒ Vips::Image

Extract an area from an image.


# File 'lib/vips/methods.rb', line 375


#extract_band(band, **opts) ⇒ Vips::Image

Extract band from an image.

Options Hash (**opts):

  • :n (Integer)

    Number of bands to extract


# File 'lib/vips/methods.rb', line 401


#falsecolour(**opts) ⇒ Vips::Image

False-color an image.


# File 'lib/vips/methods.rb', line 548


#fastcor(ref, **opts) ⇒ Vips::Image

Fast correlation.


# File 'lib/vips/methods.rb', line 2071


#filenameString

Get image filename, if any.


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# File 'lib/vips/image.rb', line 651

def filename
  get "filename"
end

#fill_nearest(**opts) ⇒ Vips::Image, Hash<Symbol => Object>

Fill image zeros with nearest non-zero pixel.

Options Hash (**opts):

  • :distance (Vips::Image)

    Output Distance to nearest non-zero pixel


# File 'lib/vips/methods.rb', line 2169


#find_trim(**opts) ⇒ Array<Integer, Integer, Integer, Integer>

Search an image for non-edge areas.

Options Hash (**opts):

  • :threshold (Float)

    Object threshold

  • :background (Array<Double>)

    Color for background pixels


# File 'lib/vips/methods.rb', line 258


#fitssave(filename, **opts) ⇒ nil

Save image to fits file.

Options Hash (**opts):

  • :page_height (Integer)

    Set page height for multipage save

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1551


#flatten(**opts) ⇒ Vips::Image

Flatten alpha out of an image.

Options Hash (**opts):

  • :background (Array<Double>)

    Background value

  • :max_alpha (Float)

    Maximum value of alpha channel


# File 'lib/vips/methods.rb', line 482


#flip(direction, **opts) ⇒ Vips::Image

Flip an image.


# File 'lib/vips/methods.rb', line 335


#fliphorImage

Flip horizontally.


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# File 'lib/vips/image.rb', line 1234

def fliphor
  flip :horizontal
end

#flipverImage

Flip vertically.


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# File 'lib/vips/image.rb', line 1241

def flipver
  flip :vertical
end

#float2rad(**opts) ⇒ Vips::Image

Transform float rgb to radiance coding.


# File 'lib/vips/methods.rb', line 1845


#floorImage

Return the largest integral value not greater than the argument.


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# File 'lib/vips/image.rb', line 983

def floor
  round :floor
end

#formatSymbol

Get image format.


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# File 'lib/vips/image.rb', line 630

def format
  get "format"
end

#freqmult(mask, **opts) ⇒ Vips::Image

Frequency-domain filtering.


# File 'lib/vips/methods.rb', line 2125


#fwfft(**opts) ⇒ Vips::Image

Forward fft.


# File 'lib/vips/methods.rb', line 2114


#gamma(**opts) ⇒ Vips::Image

Gamma an image.

Options Hash (**opts):

  • :exponent (Float)

    Gamma factor


# File 'lib/vips/methods.rb', line 553


#gaussblur(sigma, **opts) ⇒ Vips::Image

Gaussian blur.

Options Hash (**opts):

  • :min_ampl (Float)

    Minimum amplitude of Gaussian

  • :precision (Vips::Precision)

    Convolve with this precision


# File 'lib/vips/methods.rb', line 2094


#get(name) ⇒ Object

Get a metadata item from an image. Ruby types are constructed automatically from the GValue, if possible.

For example, you can read the ICC profile from an image like this:

profile = image.get "icc-profile-data"

and profile will be an array containing the profile.

Raises:


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# File 'lib/vips/image.rb', line 512

def get name
  # with old libvips, we must fetch properties (as opposed to
  # metadata) via VipsObject
  unless Vips::at_least_libvips?(8, 5)
    return super if parent_get_typeof(name) != 0
  end

  gvalue = GObject::GValue.alloc
  result = Vips::vips_image_get self, name, gvalue
  raise Vips::Error if result != 0

  gvalue.get
end

#get_fields[String]

Get the names of all fields on an image. Use this to loop over all image metadata.


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# File 'lib/vips/image.rb', line 530

def get_fields
  # vips_image_get_fields() was added in libvips 8.5
  return [] unless Vips.respond_to? :vips_image_get_fields

  array = Vips::vips_image_get_fields self

  names = []
  p = array
  until (q = p.read_pointer).null?
    names << q.read_string
    GLib::g_free q
    p += FFI::Type::POINTER.size
  end
  GLib::g_free array

  names
end

#get_typeof(name) ⇒ Integer

Get the GType of a metadata field. The result is 0 if no such field exists.

See Also:


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# File 'lib/vips/image.rb', line 488

def get_typeof name
  # on libvips before 8.5, property types must be searched first,
  # since vips_image_get_typeof returned built-in enums as int
  unless Vips::at_least_libvips?(8, 5)
    gtype = parent_get_typeof name
    return gtype if gtype != 0
  end

  Vips::vips_image_get_typeof self, name
end

#get_value(name) ⇒ Object

compatibility: old name for get


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# File 'lib/vips/image.rb', line 597

def get_value name
  get name
end

#getpoint(x, y, **opts) ⇒ Array<Double>

Read a point from an image.


# File 'lib/vips/methods.rb', line 251


#globalbalance(**opts) ⇒ Vips::Image

Global balance an image mosaic.

Options Hash (**opts):

  • :gamma (Float)

    Image gamma

  • :int_output (Boolean)

    Integer output


# File 'lib/vips/methods.rb', line 2317


#gravity(direction, width, height, **opts) ⇒ Vips::Image

Place an image within a larger image with a certain gravity.

Options Hash (**opts):

  • :extend (Vips::Extend)

    How to generate the extra pixels

  • :background (Array<Double>)

    Color for background pixels


# File 'lib/vips/methods.rb', line 325


#grid(tile_height, across, down, **opts) ⇒ Vips::Image

Grid an image.


# File 'lib/vips/methods.rb', line 501


#has_alpha?Boolean

Detect if image has an alpha channel


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# File 'lib/vips/image.rb', line 712

def has_alpha?
  return Vips::vips_image_hasalpha(self) != 0
end

#heifsave(filename, **opts) ⇒ nil

Save image in heif format.

Options Hash (**opts):

  • :page_height (Integer)

    Set page height for multipage save

  • :Q (Integer)

    Q factor

  • :lossless (Boolean)

    Enable lossless compression

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1569


#heifsave_buffer(**opts) ⇒ VipsBlob

Save image in heif format.

Options Hash (**opts):

  • :page_height (Integer)

    Set page height for multipage save

  • :Q (Integer)

    Q factor

  • :lossless (Boolean)

    Enable lossless compression

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1591


#heightInteger

Get image height, in pixels.


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# File 'lib/vips/image.rb', line 616

def height
  get "height"
end

#hist_cum(**opts) ⇒ Vips::Image

Form cumulative histogram.


# File 'lib/vips/methods.rb', line 1969


#hist_entropy(**opts) ⇒ Float

Estimate image entropy.


# File 'lib/vips/methods.rb', line 2009


#hist_equal(**opts) ⇒ Vips::Image

Histogram equalisation.

Options Hash (**opts):

  • :band (Integer)

    Equalise with this band


# File 'lib/vips/methods.rb', line 1985


#hist_find(**opts) ⇒ Vips::Image

Find image histogram.

Options Hash (**opts):

  • :band (Integer)

    Find histogram of band


# File 'lib/vips/methods.rb', line 196


#hist_find_indexed(index, **opts) ⇒ Vips::Image

Find indexed image histogram.

Options Hash (**opts):

  • :combine (Vips::Combine)

    Combine bins like this


# File 'lib/vips/methods.rb', line 208


#hist_find_ndim(**opts) ⇒ Vips::Image

Find n-dimensional image histogram.

Options Hash (**opts):

  • :bins (Integer)

    Number of bins in each dimension


# File 'lib/vips/methods.rb', line 202


#hist_ismonotonic(**opts) ⇒ Boolean

Test for monotonicity.


# File 'lib/vips/methods.rb', line 2004


#hist_local(width, height, **opts) ⇒ Vips::Image

Local histogram equalisation.

Options Hash (**opts):

  • :max_slope (Integer)

    Maximum slope (CLAHE)


# File 'lib/vips/methods.rb', line 1996


#hist_match(ref, **opts) ⇒ Vips::Image

Match two histograms.


# File 'lib/vips/methods.rb', line 1974


#hist_norm(**opts) ⇒ Vips::Image

Normalise histogram.


# File 'lib/vips/methods.rb', line 1980


#hist_plot(**opts) ⇒ Vips::Image

Plot histogram.


# File 'lib/vips/methods.rb', line 1991


#hough_circle(**opts) ⇒ Vips::Image

Find hough circle transform.

Options Hash (**opts):

  • :scale (Integer)

    Scale down dimensions by this factor

  • :min_radius (Integer)

    Smallest radius to search for

  • :max_radius (Integer)

    Largest radius to search for


# File 'lib/vips/methods.rb', line 222


#hough_line(**opts) ⇒ Vips::Image

Find hough line transform.

Options Hash (**opts):

  • :width (Integer)

    horizontal size of parameter space

  • :height (Integer)

    Vertical size of parameter space


# File 'lib/vips/methods.rb', line 215


#HSV2sRGB(**opts) ⇒ Vips::Image

Transform hsv to srgb.


# File 'lib/vips/methods.rb', line 1860


#icc_export(**opts) ⇒ Vips::Image

Output to device with icc profile.

Options Hash (**opts):

  • :pcs (Vips::PCS)

    Set Profile Connection Space

  • :intent (Vips::Intent)

    Rendering intent

  • :output_profile (String)

    Filename to load output profile from

  • :depth (Integer)

    Output device space depth in bits


# File 'lib/vips/methods.rb', line 1874


#icc_import(**opts) ⇒ Vips::Image

Import from device with icc profile.

Options Hash (**opts):

  • :pcs (Vips::PCS)

    Set Profile Connection Space

  • :intent (Vips::Intent)

    Rendering intent

  • :embedded (Boolean)

    Use embedded input profile, if available

  • :input_profile (String)

    Filename to load input profile from


# File 'lib/vips/methods.rb', line 1865


#icc_transform(output_profile, **opts) ⇒ Vips::Image

Transform between devices with icc profiles.

Options Hash (**opts):

  • :pcs (Vips::PCS)

    Set Profile Connection Space

  • :intent (Vips::Intent)

    Rendering intent

  • :embedded (Boolean)

    Use embedded input profile, if available

  • :input_profile (String)

    Filename to load input profile from

  • :depth (Integer)

    Output device space depth in bits


# File 'lib/vips/methods.rb', line 1883


#ifthenelse(th, el, **opts) ⇒ Image

Select pixels from th if self is non-zero and from el if self is zero. Use the :blend option to fade smoothly between th and el.

Options Hash (**opts):

  • :blend (Boolean) — default: false

    Blend smoothly between th and el


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# File 'lib/vips/image.rb', line 1299

def ifthenelse(th, el, **opts)
  match_image = [th, el, self].find { |x| x.is_a? Vips::Image }

  unless th.is_a? Vips::Image
    th = Operation.imageize match_image, th
  end
  unless el.is_a? Vips::Image
    el = Operation.imageize match_image, el
  end

  Vips::Operation.call "ifthenelse", [self, th, el], opts
end

#imagImage

Return the imaginary part of a complex image.


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# File 'lib/vips/image.rb', line 1111

def imag
  complexget :imag
end

#insert(sub, x, y, **opts) ⇒ Vips::Image

Insert image @sub into @main at @x, @y.

Options Hash (**opts):

  • :expand (Boolean)

    Expand output to hold all of both inputs

  • :background (Array<Double>)

    Color for new pixels


# File 'lib/vips/methods.rb', line 341


#inspectObject


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# File 'lib/vips/image.rb', line 172

def inspect
  "#<Image #{width}x#{height} #{format}, #{bands} bands, #{interpretation}>"
end

#interpretationSymbol

Get image interpretation.


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# File 'lib/vips/image.rb', line 637

def interpretation
  get "interpretation"
end

#invert(**opts) ⇒ Vips::Image

Invert an image.


# File 'lib/vips/methods.rb', line 85


#invertlut(**opts) ⇒ Vips::Image

Build an inverted look-up table.

Options Hash (**opts):

  • :size (Integer)

    LUT size to generate


# File 'lib/vips/methods.rb', line 808


#invfft(**opts) ⇒ Vips::Image

Inverse fft.

Options Hash (**opts):

  • :real (Boolean)

    Output only the real part of the transform


# File 'lib/vips/methods.rb', line 2119


#join(in2, direction, **opts) ⇒ Vips::Image

Join a pair of images.

Options Hash (**opts):

  • :expand (Boolean)

    Expand output to hold all of both inputs

  • :shim (Integer)

    Pixels between images

  • :background (Array<Double>)

    Colour for new pixels

  • :align (Vips::Align)

    Align on the low, centre or high coordinate edge


# File 'lib/vips/methods.rb', line 351


#jpegsave(filename, **opts) ⇒ nil

Save image to jpeg file.

Options Hash (**opts):

  • :page_height (Integer)

    Set page height for multipage save

  • :Q (Integer)

    Q factor

  • :profile (String)

    ICC profile to embed

  • :optimize_coding (Boolean)

    Compute optimal Huffman coding tables

  • :interlace (Boolean)

    Generate an interlaced (progressive) jpeg

  • :no_subsample (Boolean)

    Disable chroma subsample

  • :trellis_quant (Boolean)

    Apply trellis quantisation to each 8x8 block

  • :overshoot_deringing (Boolean)

    Apply overshooting to samples with extreme values

  • :optimize_scans (Boolean)

    Split the spectrum of DCT coefficients into separate scans

  • :quant_table (Integer)

    Use predefined quantization table with given index

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1392


#jpegsave_buffer(**opts) ⇒ VipsBlob

Save image to jpeg buffer.

Options Hash (**opts):

  • :page_height (Integer)

    Set page height for multipage save

  • :Q (Integer)

    Q factor

  • :profile (String)

    ICC profile to embed

  • :optimize_coding (Boolean)

    Compute optimal Huffman coding tables

  • :interlace (Boolean)

    Generate an interlaced (progressive) jpeg

  • :no_subsample (Boolean)

    Disable chroma subsample

  • :trellis_quant (Boolean)

    Apply trellis quantisation to each 8x8 block

  • :overshoot_deringing (Boolean)

    Apply overshooting to samples with extreme values

  • :optimize_scans (Boolean)

    Split the spectrum of DCT coefficients into separate scans

  • :quant_table (Integer)

    Use predefined quantization table with given index

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1410


#jpegsave_mime(**opts) ⇒ nil

Save image to jpeg mime.

Options Hash (**opts):

  • :page_height (Integer)

    Set page height for multipage save

  • :Q (Integer)

    Q factor

  • :profile (String)

    ICC profile to embed

  • :optimize_coding (Boolean)

    Compute optimal Huffman coding tables

  • :interlace (Boolean)

    Generate an interlaced (progressive) jpeg

  • :no_subsample (Boolean)

    Disable chroma subsample

  • :trellis_quant (Boolean)

    Apply trellis quantisation to each 8x8 block

  • :overshoot_deringing (Boolean)

    Apply overshooting to samples with extreme values

  • :optimize_scans (Boolean)

    Split the spectrum of DCT coefficients into separate scans

  • :quant_table (Integer)

    Use predefined quantization table with given index

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1427


#Lab2LabQ(**opts) ⇒ Vips::Image

Transform float lab to labq coding.


# File 'lib/vips/methods.rb', line 1815


#Lab2LabS(**opts) ⇒ Vips::Image

Transform float lab to signed short.


# File 'lib/vips/methods.rb', line 1835


#Lab2LCh(**opts) ⇒ Vips::Image

Transform lab to lch.


# File 'lib/vips/methods.rb', line 1770


#Lab2XYZ(**opts) ⇒ Vips::Image

Transform cielab to xyz.

Options Hash (**opts):

  • :temp (Array<Double>)

    Color temperature


# File 'lib/vips/methods.rb', line 1758


#labelregions(**opts) ⇒ Vips::Image, Hash<Symbol => Object>

Label regions in an image.

Options Hash (**opts):

  • :segments (Integer)

    Output Number of discrete contigious regions


# File 'lib/vips/methods.rb', line 2163


#LabQ2Lab(**opts) ⇒ Vips::Image

Unpack a labq image to float lab.


# File 'lib/vips/methods.rb', line 1810


#LabQ2LabS(**opts) ⇒ Vips::Image

Unpack a labq image to short lab.


# File 'lib/vips/methods.rb', line 1820


#LabQ2sRGB(**opts) ⇒ Vips::Image

Convert a labq image to srgb.


# File 'lib/vips/methods.rb', line 1850


#LabS2Lab(**opts) ⇒ Vips::Image

Transform signed short lab to float.


# File 'lib/vips/methods.rb', line 1830


#LabS2LabQ(**opts) ⇒ Vips::Image

Transform short lab to labq coding.


# File 'lib/vips/methods.rb', line 1825


#LCh2CMC(**opts) ⇒ Vips::Image

Transform lch to cmc.


# File 'lib/vips/methods.rb', line 1780


#LCh2Lab(**opts) ⇒ Vips::Image

Transform lch to lab.


# File 'lib/vips/methods.rb', line 1775


#linear(a, b, **opts) ⇒ Vips::Image

Calculate (a * in + b).

Options Hash (**opts):

  • :uchar (Boolean)

    Output should be uchar


# File 'lib/vips/methods.rb', line 90


#linecache(**opts) ⇒ Vips::Image

Cache an image as a set of lines.

Options Hash (**opts):

  • :tile_height (Integer)

    Tile height in pixels

  • :access (Vips::Access)

    Expected access pattern

  • :threaded (Boolean)

    Allow threaded access

  • :persistent (Boolean)

    Keep cache between evaluations


# File 'lib/vips/methods.rb', line 291


#logImage

Return the natural log of an image.


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# File 'lib/vips/image.rb', line 1206

def log
  math :log
end

#log10Image

Return the log base 10 of an image.


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# File 'lib/vips/image.rb', line 1213

def log10
  math :log10
end

#magicksave(filename, **opts) ⇒ nil

Save file with imagemagick.

Options Hash (**opts):

  • :format (String)

    Format to save in

  • :quality (Integer)

    Quality to use

  • :page_height (Integer)

    Set page height for multipage save

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1530


#magicksave_buffer(**opts) ⇒ VipsBlob

Save image to magick buffer.

Options Hash (**opts):

  • :format (String)

    Format to save in

  • :quality (Integer)

    Quality to use

  • :page_height (Integer)

    Set page height for multipage save

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1541


#mapim(index, **opts) ⇒ Vips::Image

Resample with a map image.

Options Hash (**opts):


# File 'lib/vips/methods.rb', line 1646


#maplut(lut, **opts) ⇒ Vips::Image

Map an image though a lut.

Options Hash (**opts):

  • :band (Integer)

    apply one-band lut to this band of in


# File 'lib/vips/methods.rb', line 1945


#match(sec, xr1, yr1, xs1, ys1, xr2, yr2, xs2, ys2, **opts) ⇒ Vips::Image

First-order match of two images.

Options Hash (**opts):

  • :hwindow (Integer)

    Half window size

  • :harea (Integer)

    Half area size

  • :search (Boolean)

    Search to improve tie-points

  • :interpolate (Vips::Interpolate)

    Interpolate pixels with this


# File 'lib/vips/methods.rb', line 2299


#math(math, **opts) ⇒ Vips::Image

Apply a math operation to an image.


# File 'lib/vips/methods.rb', line 98


#math2(right, math2, **opts) ⇒ Vips::Image

Binary math operations.


# File 'lib/vips/methods.rb', line 59


#math2_const(math2, c, **opts) ⇒ Vips::Image

Binary math operations with a constant.


# File 'lib/vips/methods.rb', line 140


#matrixprint(**opts) ⇒ nil

Print matrix.

Options Hash (**opts):

  • :page_height (Integer)

    Set page height for multipage save

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1253


#matrixsave(filename, **opts) ⇒ nil

Save image to matrix file.

Options Hash (**opts):

  • :page_height (Integer)

    Set page height for multipage save

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1244


#max(**opts) ⇒ Float, Hash<Symbol => Object>

Find image maximum.

Options Hash (**opts):

  • :size (Integer)

    Number of maximum values to find

  • :x (Integer)

    Output Horizontal position of maximum

  • :y (Integer)

    Output Vertical position of maximum

  • :out_array (Array<Double>)

    Output Array of output values

  • :x_array (Array<Integer>)

    Output Array of horizontal positions

  • :y_array (Array<Integer>)

    Output Array of vertical positions


# File 'lib/vips/methods.rb', line 175


#maxposReal

Return the coordinates of the image maximum.


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# File 'lib/vips/image.rb', line 1075

def maxpos
  v, opts = max x: true, y: true
  x = opts['x']
  y = opts['y']
  return v, x, y
end

#measure(h, v, **opts) ⇒ Vips::Image

Measure a set of patches on a color chart.

Options Hash (**opts):

  • :left (Integer)

    Left edge of extract area

  • :top (Integer)

    Top edge of extract area

  • :width (Integer)

    Width of extract area

  • :height (Integer)

    Height of extract area


# File 'lib/vips/methods.rb', line 240


#median(size = 3) ⇒ Image

a median filter


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# File 'lib/vips/image.rb', line 1097

def median size = 3
  rank size, size, (size * size) / 2
end

#merge(sec, direction, dx, dy, **opts) ⇒ Vips::Image

Merge two images.

Options Hash (**opts):

  • :mblend (Integer)

    Maximum blend size


# File 'lib/vips/methods.rb', line 2247


#min(**opts) ⇒ Float, Hash<Symbol => Object>

Find image minimum.

Options Hash (**opts):

  • :size (Integer)

    Number of minimum values to find

  • :x (Integer)

    Output Horizontal position of minimum

  • :y (Integer)

    Output Vertical position of minimum

  • :out_array (Array<Double>)

    Output Array of output values

  • :x_array (Array<Integer>)

    Output Array of horizontal positions

  • :y_array (Array<Integer>)

    Output Array of vertical positions


# File 'lib/vips/methods.rb', line 164


#minposReal

Return the coordinates of the image minimum.


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# File 'lib/vips/image.rb', line 1086

def minpos
  v, opts = min x: true, y: true
  x = opts['x']
  y = opts['y']
  return v, x, y
end

#morph(mask, morph, **opts) ⇒ Vips::Image

Morphology operation.


# File 'lib/vips/methods.rb', line 2142


#mosaic(sec, direction, xref, yref, xsec, ysec, **opts) ⇒ Vips::Image, Hash<Symbol => Object>

Mosaic two images.

Options Hash (**opts):

  • :hwindow (Integer)

    Half window size

  • :harea (Integer)

    Half area size

  • :mblend (Integer)

    Maximum blend size

  • :bandno (Integer)

    Band to search for features on

  • :dx0 (Integer)

    Output Detected integer offset

  • :dy0 (Integer)

    Output Detected integer offset

  • :scale1 (Float)

    Output Detected scale

  • :angle1 (Float)

    Output Detected rotation

  • :dy1 (Float)

    Output Detected first-order displacement

  • :dx1 (Float)

    Output Detected first-order displacement


# File 'lib/vips/methods.rb', line 2257


#mosaic1(sec, direction, xr1, yr1, xs1, ys1, xr2, yr2, xs2, ys2, **opts) ⇒ Vips::Image

First-order mosaic of two images.

Options Hash (**opts):

  • :hwindow (Integer)

    Half window size

  • :harea (Integer)

    Half area size

  • :search (Boolean)

    Search to improve tie-points

  • :interpolate (Vips::Interpolate)

    Interpolate pixels with this

  • :mblend (Integer)

    Maximum blend size

  • :bandno (Integer)

    Band to search for features on


# File 'lib/vips/methods.rb', line 2278


#msb(**opts) ⇒ Vips::Image

Pick most-significant byte from an image.

Options Hash (**opts):

  • :band (Integer)

    Band to msb


# File 'lib/vips/methods.rb', line 537


#multiply(right, **opts) ⇒ Vips::Image

Multiply two images.


# File 'lib/vips/methods.rb', line 27


#new_from_image(value) ⇒ Image

A new image is created with the same width, height, format, interpretation, resolution and offset as self, but with every pixel set to the specified value.

You can pass an array to make a many-band image, or a single value to make a one-band image.


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# File 'lib/vips/image.rb', line 378

def new_from_image value
  pixel = (Vips::Image.black(1, 1) + value).cast(format)
  image = pixel.embed 0, 0, width, height, extend: :copy
  image.copy interpretation: interpretation, xres: xres, yres: yres,
    xoffset: xoffset, yoffset: yoffset
end

#niftisave(filename, **opts) ⇒ nil

Save image to nifti file.

Options Hash (**opts):

  • :page_height (Integer)

    Set page height for multipage save

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1560


#offsetFloat

Get offset metadata.


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# File 'lib/vips/image.rb', line 695

def offset
  return 0 if get_typeof("offset") == 0

  get "offset"
end

#parent_get_typeofObject


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# File 'lib/vips/image.rb', line 62

alias_method :parent_get_typeof, :get_typeof

#percent(percent, **opts) ⇒ Integer

Find threshold for percent of pixels.


# File 'lib/vips/methods.rb', line 1952


#phasecor(in2, **opts) ⇒ Vips::Image

Calculate phase correlation.


# File 'lib/vips/methods.rb', line 2136


#pngsave(filename, **opts) ⇒ nil

Save image to png file.

Options Hash (**opts):

  • :compression (Integer)

    Compression factor

  • :interlace (Boolean)

    Interlace image

  • :page_height (Integer)

    Set page height for multipage save

  • :profile (String)

    ICC profile to embed

  • :filter (Vips::ForeignPngFilter)

    libpng row filter flag(s)

  • :palette (Boolean)

    Quantise to 8bpp palette

  • :colours (Integer)

    Max number of palette colours

  • :Q (Integer)

    Quantisation quality

  • :dither (Float)

    Amount of dithering

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1359


#pngsave_buffer(**opts) ⇒ VipsBlob

Save image to png buffer.

Options Hash (**opts):

  • :compression (Integer)

    Compression factor

  • :interlace (Boolean)

    Interlace image

  • :page_height (Integer)

    Set page height for multipage save

  • :profile (String)

    ICC profile to embed

  • :filter (Vips::ForeignPngFilter)

    libpng row filter flag(s)

  • :palette (Boolean)

    Quantise to 8bpp palette

  • :colours (Integer)

    Max number of palette colours

  • :Q (Integer)

    Quantisation quality

  • :dither (Float)

    Amount of dithering

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1376


#polarImage

Return an image with rectangular pixels converted to polar.

The image can be complex, in which case the return image will also be complex, or must have an even number of bands, in which case pairs of bands are treated as (x, y) coordinates.

See Also:


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# File 'lib/vips/image.rb', line 1124

def polar
  Image::run_cmplx(self) { |x| x.complex :polar }
end

#ppmsave(filename, **opts) ⇒ nil

Save image to ppm file.

Options Hash (**opts):

  • :page_height (Integer)

    Set page height for multipage save

  • :ascii (Boolean)

    save as ascii

  • :squash (Boolean)

    save as one bit

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1288


#premultiply(**opts) ⇒ Vips::Image

Premultiply image alpha.

Options Hash (**opts):

  • :max_alpha (Float)

    Maximum value of alpha channel


# File 'lib/vips/methods.rb', line 489


#profile(**opts) ⇒ Array<Vips::Image, Vips::Image>

Find image profiles.


# File 'lib/vips/methods.rb', line 235


#project(**opts) ⇒ Array<Vips::Image, Vips::Image>

Find image projections.


# File 'lib/vips/methods.rb', line 230


#quadratic(coeff, **opts) ⇒ Vips::Image

Resample an image with a quadratic transform.

Options Hash (**opts):


# File 'lib/vips/methods.rb', line 1697


#rad2float(**opts) ⇒ Vips::Image

Unpack radiance coding to float rgb.


# File 'lib/vips/methods.rb', line 1840


#radsave(filename, **opts) ⇒ nil

Save image to radiance file.

Options Hash (**opts):

  • :page_height (Integer)

    Set page height for multipage save

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1299


#radsave_buffer(**opts) ⇒ VipsBlob

Save image to radiance buffer.

Options Hash (**opts):

  • :page_height (Integer)

    Set page height for multipage save

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1308


#rank(width, height, index, **opts) ⇒ Vips::Image

Rank filter.


# File 'lib/vips/methods.rb', line 2149


#rawsave(filename, **opts) ⇒ nil

Save image to raw file.

Options Hash (**opts):

  • :page_height (Integer)

    Set page height for multipage save

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1261


#rawsave_fd(fd, **opts) ⇒ nil

Write raw image to file descriptor.

Options Hash (**opts):

  • :page_height (Integer)

    Set page height for multipage save

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1270


#realImage

Return the real part of a complex image.


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# File 'lib/vips/image.rb', line 1104

def real
  complexget :real
end

#recomb(m, **opts) ⇒ Vips::Image

Linear recombination with matrix.


# File 'lib/vips/methods.rb', line 464


#rectImage

Return an image with polar pixels converted to rectangular.

The image can be complex, in which case the return image will also be complex, or must have an even number of bands, in which case pairs of bands are treated as (x, y) coordinates.

See Also:


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# File 'lib/vips/image.rb', line 1137

def rect
  Image::run_cmplx(self) { |x| x.complex :rect }
end

#reduce(hshrink, vshrink, **opts) ⇒ Vips::Image

Reduce an image.

Options Hash (**opts):

  • :kernel (Vips::Kernel)

    Resampling kernel

  • :centre (Boolean)

    Use centre sampling convention


# File 'lib/vips/methods.rb', line 1688


#reduceh(hshrink, **opts) ⇒ Vips::Image

Shrink an image horizontally.

Options Hash (**opts):

  • :kernel (Vips::Kernel)

    Resampling kernel

  • :centre (Boolean)

    Use centre sampling convention


# File 'lib/vips/methods.rb', line 1672


#reducev(vshrink, **opts) ⇒ Vips::Image

Shrink an image vertically.

Options Hash (**opts):

  • :kernel (Vips::Kernel)

    Resampling kernel

  • :centre (Boolean)

    Use centre sampling convention


# File 'lib/vips/methods.rb', line 1680


#relational(right, relational, **opts) ⇒ Vips::Image

Relational operation on two images.


# File 'lib/vips/methods.rb', line 39


#relational_const(relational, c, **opts) ⇒ Vips::Image

Relational operations against a constant.


# File 'lib/vips/methods.rb', line 120


#remainder(right, **opts) ⇒ Vips::Image

Remainder after integer division of two images.


# File 'lib/vips/methods.rb', line 46


#remainder_const(c, **opts) ⇒ Vips::Image

Remainder after integer division of an image and a constant.


# File 'lib/vips/methods.rb', line 127


#remove(name) ⇒ Object

Remove a metadata item from an image.


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# File 'lib/vips/image.rb', line 592

def remove name
  Vips::vips_image_remove self, name
end

#replicate(across, down, **opts) ⇒ Vips::Image

Replicate an image.


# File 'lib/vips/methods.rb', line 432


#resize(scale, **opts) ⇒ Vips::Image

Resize an image.

Options Hash (**opts):

  • :kernel (Vips::Kernel)

    Resampling kernel

  • :vscale (Float)

    Vertical scale image by this factor


# File 'lib/vips/methods.rb', line 1743


#respond_to?(name, include_all = false) ⇒ Boolean


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# File 'lib/vips/image.rb', line 176

def respond_to? name, include_all = false
  # To support keyword args, we need to tell Ruby that final image
  # arguments cannot be hashes of keywords.
  #
  # https://makandracards.com/makandra/
  #   36013-heads-up-ruby-implicitly-converts-a-hash-to-keyword-arguments
  return false if name == :to_hash

  # respond to all vips operations by nickname
  return true if Vips::type_find("VipsOperation", name.to_s) != 0

  super
end

#rintImage

Return the nearest integral value.


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# File 'lib/vips/image.rb', line 997

def rint
  round :rint
end

#rot(angle, **opts) ⇒ Vips::Image

Rotate an image.


# File 'lib/vips/methods.rb', line 446


#rot180Image

Rotate by 180 degrees clockwise.


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# File 'lib/vips/image.rb', line 1279

def rot180
  rot :d180
end

#rot270Image

Rotate by 270 degrees clockwise.


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# File 'lib/vips/image.rb', line 1286

def rot270
  rot :d270
end

#rot45(**opts) ⇒ Vips::Image

Rotate an image.

Options Hash (**opts):


# File 'lib/vips/methods.rb', line 452


#rot90Image

Rotate by 90 degrees clockwise.


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# File 'lib/vips/image.rb', line 1272

def rot90
  rot :d90
end

#rotate(angle, **opts) ⇒ Vips::Image

Rotate an image by a number of degrees.

Options Hash (**opts):

  • :interpolate (Vips::Interpolate)

    Interpolate pixels with this

  • :background (Array<Double>)

    Background value

  • :odx (Float)

    Horizontal output displacement

  • :ody (Float)

    Vertical output displacement

  • :idx (Float)

    Horizontal input displacement

  • :idy (Float)

    Vertical input displacement


# File 'lib/vips/methods.rb', line 1731


#round(round, **opts) ⇒ Vips::Image

Perform a round function on an image.


# File 'lib/vips/methods.rb', line 114


#scaleFloat

Get scale metadata.


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# File 'lib/vips/image.rb', line 686

def scale
  return 1 if get_typeof("scale") == 0

  get "scale"
end

#scaleimage(**opts) ⇒ Vips::Image

Scale an image to uchar. This is the vips scale operation, but renamed to avoid a clash with the .scale property.


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# File 'lib/vips/image.rb', line 1317

def scaleimage **opts
  Vips::Image.scale self, opts
end

#scRGB2BW(**opts) ⇒ Vips::Image

Convert scrgb to bw.

Options Hash (**opts):

  • :depth (Integer)

    Output device space depth in bits


# File 'lib/vips/methods.rb', line 1917


#scRGB2sRGB(**opts) ⇒ Vips::Image

Convert an scrgb image to srgb.

Options Hash (**opts):

  • :depth (Integer)

    Output device space depth in bits


# File 'lib/vips/methods.rb', line 1923


#scRGB2XYZ(**opts) ⇒ Vips::Image

Transform scrgb to xyz.


# File 'lib/vips/methods.rb', line 1800


#sequential(**opts) ⇒ Vips::Image

Check sequential access.

Options Hash (**opts):

  • :tile_height (Integer)

    Tile height in pixels


# File 'lib/vips/methods.rb', line 300


#set(name, value) ⇒ Object

Set the value of a metadata item on an image. The metadata item must already exist. Ruby types are automatically transformed into the matching GValue, if possible.

For example, you can use this to set an image's ICC profile:

x = y.set "icc-profile-data", profile

where profile is an ICC profile held as a binary string object.

See Also:


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# File 'lib/vips/image.rb', line 585

def set name, value
  set_type get_typeof(name), name, value
end

#set_type(gtype, name, value) ⇒ Object

Create a metadata item on an image of the specifed type. Ruby types are automatically transformed into the matching GType, if possible.

For example, you can use this to set an image's ICC profile:

x = y.set_type Vips::BLOB_TYPE, "icc-profile-data", profile

where profile is an ICC profile held as a binary string object.

See Also:


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# File 'lib/vips/image.rb', line 563

def set_type gtype, name, value
  gvalue = GObject::GValue.alloc
  gvalue.init gtype
  gvalue.set value
  Vips::vips_image_set self, name, gvalue
end

#set_value(name, value) ⇒ Object

compatibility: old name for set


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# File 'lib/vips/image.rb', line 602

def set_value name, value
  set name, value
end

#sharpen(**opts) ⇒ Vips::Image

Unsharp masking for print.

Options Hash (**opts):

  • :sigma (Float)

    Sigma of Gaussian

  • :x1 (Float)

    Flat/jaggy threshold

  • :y2 (Float)

    Maximum brightening

  • :y3 (Float)

    Maximum darkening

  • :m1 (Float)

    Slope for flat areas

  • :m2 (Float)

    Slope for jaggy areas


# File 'lib/vips/methods.rb', line 2083


#shrink(hshrink, vshrink, **opts) ⇒ Vips::Image

Shrink an image.


# File 'lib/vips/methods.rb', line 1653


#shrinkh(hshrink, **opts) ⇒ Vips::Image

Shrink an image horizontally.


# File 'lib/vips/methods.rb', line 1660


#shrinkv(vshrink, **opts) ⇒ Vips::Image

Shrink an image vertically.


# File 'lib/vips/methods.rb', line 1666


#sign(**opts) ⇒ Vips::Image

Unit vector of pixel.


# File 'lib/vips/methods.rb', line 109


#similarity(**opts) ⇒ Vips::Image

Similarity transform of an image.

Options Hash (**opts):

  • :scale (Float)

    Scale by this factor

  • :angle (Float)

    Rotate anticlockwise by this many degrees

  • :interpolate (Vips::Interpolate)

    Interpolate pixels with this

  • :background (Array<Double>)

    Background value

  • :odx (Float)

    Horizontal output displacement

  • :ody (Float)

    Vertical output displacement

  • :idx (Float)

    Horizontal input displacement

  • :idy (Float)

    Vertical input displacement


# File 'lib/vips/methods.rb', line 1718


#sinImage

Return the sine of an image in degrees.


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# File 'lib/vips/image.rb', line 1164

def sin
  math :sin
end

#sizeInteger

Get the image size.


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# File 'lib/vips/image.rb', line 704

def size
  [width, height]
end

#smartcrop(width, height, **opts) ⇒ Vips::Image

Extract an area from an image.

Options Hash (**opts):


# File 'lib/vips/methods.rb', line 393


#sobel(**opts) ⇒ Vips::Image

Sobel edge detector.


# File 'lib/vips/methods.rb', line 2109


#spcor(ref, **opts) ⇒ Vips::Image

Spatial correlation.


# File 'lib/vips/methods.rb', line 2077


#spectrum(**opts) ⇒ Vips::Image

Make displayable power spectrum.


# File 'lib/vips/methods.rb', line 2131


#sRGB2HSV(**opts) ⇒ Vips::Image

Transform srgb to hsv.


# File 'lib/vips/methods.rb', line 1855


#sRGB2scRGB(**opts) ⇒ Vips::Image

Convert an srgb image to scrgb.


# File 'lib/vips/methods.rb', line 1912


#stats(**opts) ⇒ Vips::Image

Find many image stats.


# File 'lib/vips/methods.rb', line 191


#stdif(width, height, **opts) ⇒ Vips::Image

Statistical difference.

Options Hash (**opts):

  • :s0 (Float)

    New deviation

  • :b (Float)

    Weight of new deviation

  • :m0 (Float)

    New mean

  • :a (Float)

    Weight of new mean


# File 'lib/vips/methods.rb', line 1958


#subsample(xfac, yfac, **opts) ⇒ Vips::Image

Subsample an image.

Options Hash (**opts):

  • :point (Boolean)

    Point sample


# File 'lib/vips/methods.rb', line 529


#subtract(right, **opts) ⇒ Vips::Image

Subtract two images.


# File 'lib/vips/methods.rb', line 21


#tanImage

Return the tangent of an image in degrees.


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# File 'lib/vips/image.rb', line 1178

def tan
  math :tan
end

#thumbnail_image(width, **opts) ⇒ Vips::Image

Generate thumbnail from image.

Options Hash (**opts):

  • :height (Integer)

    Size to this height

  • :size (Vips::Size)

    Only upsize, only downsize, or both

  • :no_rotate (Boolean)

    Don't use orientation tags to rotate image upright

  • :crop (Vips::Interesting)

    Reduce to fill target rectangle, then crop

  • :linear (Boolean)

    Reduce in linear light

  • :import_profile (String)

    Fallback import profile

  • :export_profile (String)

    Fallback export profile

  • :intent (Vips::Intent)

    Rendering intent


# File 'lib/vips/methods.rb', line 1632


#tiffsave(filename, **opts) ⇒ nil

Save image to tiff file.

Options Hash (**opts):

  • :compression (Vips::ForeignTiffCompression)

    Compression for this file

  • :Q (Integer)

    Q factor

  • :predictor (Vips::ForeignTiffPredictor)

    Compression prediction

  • :page_height (Integer)

    Set page height for multipage save

  • :profile (String)

    ICC profile to embed

  • :tile (Boolean)

    Write a tiled tiff

  • :tile_width (Integer)

    Tile width in pixels

  • :tile_height (Integer)

    Tile height in pixels

  • :pyramid (Boolean)

    Write a pyramidal tiff

  • :miniswhite (Boolean)

    Use 0 for white in 1-bit images

  • :squash (Boolean)

    Squash images down to 1 bit

  • :resunit (Vips::ForeignTiffResunit)

    Resolution unit

  • :xres (Float)

    Horizontal resolution in pixels/mm

  • :yres (Float)

    Vertical resolution in pixels/mm

  • :bigtiff (Boolean)

    Write a bigtiff image

  • :properties (Boolean)

    Write a properties document to IMAGEDESCRIPTION

  • :region_shrink (Vips::RegionShrink)

    Method to shrink regions

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1481


#tiffsave_buffer(**opts) ⇒ VipsBlob

Save image to tiff buffer.

Options Hash (**opts):

  • :compression (Vips::ForeignTiffCompression)

    Compression for this file

  • :Q (Integer)

    Q factor

  • :predictor (Vips::ForeignTiffPredictor)

    Compression prediction

  • :page_height (Integer)

    Set page height for multipage save

  • :profile (String)

    ICC profile to embed

  • :tile (Boolean)

    Write a tiled tiff

  • :tile_width (Integer)

    Tile width in pixels

  • :tile_height (Integer)

    Tile height in pixels

  • :pyramid (Boolean)

    Write a pyramidal tiff

  • :miniswhite (Boolean)

    Use 0 for white in 1-bit images

  • :squash (Boolean)

    Squash images down to 1 bit

  • :resunit (Vips::ForeignTiffResunit)

    Resolution unit

  • :xres (Float)

    Horizontal resolution in pixels/mm

  • :yres (Float)

    Vertical resolution in pixels/mm

  • :bigtiff (Boolean)

    Write a bigtiff image

  • :properties (Boolean)

    Write a properties document to IMAGEDESCRIPTION

  • :region_shrink (Vips::RegionShrink)

    Method to shrink regions

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1506


#tilecache(**opts) ⇒ Vips::Image

Cache an image as a set of tiles.

Options Hash (**opts):

  • :tile_width (Integer)

    Tile width in pixels

  • :tile_height (Integer)

    Tile height in pixels

  • :max_tiles (Integer)

    Maximum number of tiles to cache

  • :access (Vips::Access)

    Expected access pattern

  • :threaded (Boolean)

    Allow threaded access

  • :persistent (Boolean)

    Keep cache between evaluations


# File 'lib/vips/methods.rb', line 280


#to_aArray

Convert to an Array. This will be slow for large images.


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# File 'lib/vips/image.rb', line 949

def to_a
  # we render the image to a big string, then unpack
  # as a Ruby array of the correct type
  memory = write_to_memory

  # make the template for unpack
  template = {
    char: 'c',
    uchar: 'C',
    short: 's_',
    ushort: 'S_',
    int: 'i_',
    uint: 'I_',
    float: 'f',
    double: 'd',
    complex: 'f',
    dpcomplex: 'd'
  }[format] + '*'

  # and unpack into something like [1, 2, 3, 4 ..]
  array = memory.unpack(template)

  # gather band elements together
  pixel_array = array.each_slice(bands).to_a

  # build rows
  row_array = pixel_array.each_slice(width).to_a

  return row_array
end

#transpose3d(**opts) ⇒ Vips::Image

Transpose3d an image.

Options Hash (**opts):

  • :page_height (Integer)

    Height of each input page


# File 'lib/vips/methods.rb', line 509


#unpremultiply(**opts) ⇒ Vips::Image

Unpremultiply image alpha.

Options Hash (**opts):

  • :max_alpha (Float)

    Maximum value of alpha channel


# File 'lib/vips/methods.rb', line 495


#vipssave(filename, **opts) ⇒ nil

Save image to vips file.

Options Hash (**opts):

  • :page_height (Integer)

    Set page height for multipage save

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1279


#webpsave(filename, **opts) ⇒ nil

Save image to webp file.

Options Hash (**opts):

  • :page_height (Integer)

    Set page height for multipage save

  • :Q (Integer)

    Q factor

  • :lossless (Boolean)

    enable lossless compression

  • :preset (Vips::ForeignWebpPreset)

    Preset for lossy compression

  • :smart_subsample (Boolean)

    Enable high quality chroma subsampling

  • :near_lossless (Boolean)

    Enable preprocessing in lossless mode (uses Q)

  • :alpha_q (Integer)

    Change alpha plane fidelity for lossy compression

  • :min_size (Boolean)

    Optimise for minium size

  • :kmin (Integer)

    Minimum number of frames between key frames

  • :kmax (Integer)

    Maximum number of frames between key frames

  • :reduction_effort (Integer)

    Level of CPU effort to reduce file size

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1444


#webpsave_buffer(**opts) ⇒ VipsBlob

Save image to webp buffer.

Options Hash (**opts):

  • :page_height (Integer)

    Set page height for multipage save

  • :Q (Integer)

    Q factor

  • :lossless (Boolean)

    enable lossless compression

  • :preset (Vips::ForeignWebpPreset)

    Preset for lossy compression

  • :smart_subsample (Boolean)

    Enable high quality chroma subsampling

  • :near_lossless (Boolean)

    Enable preprocessing in lossless mode (uses Q)

  • :alpha_q (Integer)

    Change alpha plane fidelity for lossy compression

  • :min_size (Boolean)

    Optimise for minium size

  • :kmin (Integer)

    Minimum number of frames between key frames

  • :kmax (Integer)

    Maximum number of frames between key frames

  • :reduction_effort (Integer)

    Level of CPU effort to reduce file size

  • :strip (Boolean)

    Strip all metadata from image

  • :background (Array<Double>)

    Background value


# File 'lib/vips/methods.rb', line 1463


#widthInteger

Get image width, in pixels.


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# File 'lib/vips/image.rb', line 609

def width
  get "width"
end

#wrap(**opts) ⇒ Vips::Image

Wrap image origin.

Options Hash (**opts):

  • :x (Integer)

    Left edge of input in output

  • :y (Integer)

    Top edge of input in output


# File 'lib/vips/methods.rb', line 515


#write_to_buffer(format_string, **opts) ⇒ String

Write this image to a memory buffer. Save options may be encoded in the format_string or given as a hash. For example:

buffer = image.write_to_buffer ".jpg[Q=90]"

or equivalently:

image.write_to_buffer ".jpg", Q: 90

The full set of save options depend on the selected saver. Try something like:

$ vips jpegsave

to see all the available options for JPEG save.

Options Hash (**opts):

  • :strip (Boolean) — default: false

    Strip all metadata from image

  • :background (Array<Float>) — default: 0

    Background colour to flatten alpha against, if necessary

Raises:


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# File 'lib/vips/image.rb', line 452

def write_to_buffer format_string, **opts
  filename = Vips::p2str(Vips::vips_filename_get_filename format_string)
  option_string = Vips::p2str(Vips::vips_filename_get_options format_string)
  saver = Vips::vips_foreign_find_save_buffer filename
  if saver == nil
    raise Vips::Error, "No known saver for '#{filename}'."
  end

  buffer = Vips::Operation.call saver, [self], opts, option_string
  raise Vips::Error if buffer == nil

  write_gc

  return buffer
end

#write_to_file(name, **opts) ⇒ Object

Write this image to a file. Save options may be encoded in the filename or given as a hash. For example:

image.write_to_file "fred.jpg[Q=90]"

or equivalently:

image.write_to_file "fred.jpg", Q: 90

The full set of save options depend on the selected saver. Try something like:

$ vips jpegsave

to see all the available options for JPEG save.

Options Hash (**opts):

  • :strip (Boolean) — default: false

    Strip all metadata from image

  • :background (Array<Float>) — default: 0

    Background colour to flatten alpha against, if necessary


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# File 'lib/vips/image.rb', line 414

def write_to_file name, **opts
  filename = Vips::p2str(Vips::vips_filename_get_filename name)
  option_string = Vips::p2str(Vips::vips_filename_get_options name)
  saver = Vips::vips_foreign_find_save filename
  if saver == nil
    raise Vips::Error, "No known saver for '#{filename}'."
  end

  Vips::Operation.call saver, [self, filename], opts, option_string

  write_gc
end

#write_to_memoryString

Write this image to a large memory buffer.

Raises:


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# File 'lib/vips/image.rb', line 471

def write_to_memory
  len = Vips::SizeStruct.new
  ptr = Vips::vips_image_write_to_memory self, len
  raise Vips::Error if ptr == nil

  # wrap up as an autopointer
  ptr = FFI::AutoPointer.new(ptr, GLib::G_FREE)

  ptr.get_bytes 0, len[:value]
end

#xoffsetInteger

Get image xoffset.


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# File 'lib/vips/image.rb', line 658

def xoffset
  get "xoffset"
end

#xresFloat

Get image x resolution.


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# File 'lib/vips/image.rb', line 672

def xres
  get "xres"
end

#XYZ2CMYK(**opts) ⇒ Vips::Image

Transform xyz to cmyk.


# File 'lib/vips/methods.rb', line 1934


#XYZ2Lab(**opts) ⇒ Vips::Image

Transform xyz to lab.

Options Hash (**opts):

  • :temp (Array<Double>)

    Colour temperature


# File 'lib/vips/methods.rb', line 1764


#XYZ2scRGB(**opts) ⇒ Vips::Image

Transform xyz to scrgb.


# File 'lib/vips/methods.rb', line 1805


#XYZ2Yxy(**opts) ⇒ Vips::Image

Transform xyz to yxy.


# File 'lib/vips/methods.rb', line 1790


#yoffsetInteger

Get image yoffset.


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# File 'lib/vips/image.rb', line 665

def yoffset
  get "yoffset"
end

#yresFloat

Get image y resolution.


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# File 'lib/vips/image.rb', line 679

def yres
  get "yres"
end

#Yxy2XYZ(**opts) ⇒ Vips::Image

Transform yxy to xyz.


# File 'lib/vips/methods.rb', line 1795


#zoom(xfac, yfac, **opts) ⇒ Vips::Image

Zoom an image.


# File 'lib/vips/methods.rb', line 522


#|(other) ⇒ Image

Integer bitwise OR with an image, constant or array.


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# File 'lib/vips/image.rb', line 825

def | other
  call_enum "boolean", other, :or
end

#~Image

Equivalent to image ^ -1


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# File 'lib/vips/image.rb', line 855

def ~
  self ^ -1
end