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module Magick |
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Table Of Contents |
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module methods |
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colors | Magick.colors { |color| block } ->
Magick Magick.colors -> anArray |
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Description |
Lists the named
colors that ImageMagick knows about. If the optional
block is present, calls the block once for each color,
passing a Magick::Color object. Otherwise, returns an
array of Magick::Color objects, one for each color.
The Magick::Color class is a Struct class with the following attributes:
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Arguments | None | ||||||||||||||||||||
Returns | If no block is associated with the call, returns an array of Magick::Color objects. | ||||||||||||||||||||
Example |
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ImageMagick API | GetColorInfo | ||||||||||||||||||||
fonts | Magick.fonts { |font| block } ->
Magick Magick.fonts -> anArray |
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Description |
Lists the fonts that ImageMagick knows about. If the
optional block is present, calls the block once for each
font, passing a Magick::Font object. Otherwise, returns
an array of Magick::Font objects, one for each font.
The Magick::Font class is a Struct class with the following attributes:
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Arguments | None | ||||||||||||||||||||
Returns | If no block is associated with the call, returns an array of Magick::Font objects. | ||||||||||||||||||||
Example | fonts.rb | ||||||||||||||||||||
ImageMagick API | GetFontInfo | ||||||||||||||||||||
formats | Magick.formats { |f,v| block } ->
Magick Magick.formats -> aHash |
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Description | Describes the image formats supported by ImageMagick (and therefore RMagick). If the optional block is present, calls the block once for each image format. The first argument, f, is the format name. The second argument, v, is the properties string described below. | ||||||||||||||||||||
Arguments | None | ||||||||||||||||||||
Returns |
A hash of ImageMagick image formats and their properties.
Each key in the returned hash is the name of a supported
ImageMagick image format. Each value is a string in the
form "BRWA", where
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Example |
p Magick.formats » {"TIF"=>"*rw+", "H"=>"*rw-", "MNG"=>"*rw+", "NULL"=>"*rw-", ... "G"=>"*rw+", "GIF"=>"*rw+", "PDB"=>"*rw+"} |
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ImageMagick notes | http://www.imagemagick.org/www/formats.html | ||||||||||||||||||||
Advanced | ImageMagick depends on external programs for some formats. Depending on how ImageMagick was installed on your system, some formats may not be available. If you have questions, ask your system administrator. | ||||||||||||||||||||
set_cache_threshold | Magick.set_cache_threshold(n) | ||||||||||||||||||||
Description | Sets the amount of free memory allocated for the pixel cache. | ||||||||||||||||||||
Arguments | An integer number of megabytes. | ||||||||||||||||||||
Example |
# set the cache threshold to 10Mb Magick.set_cache_threshold(10) |
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ImageMagick notes | Once this threshold is exceeded, all subsequent pixels cache operations are to/from disk. | ||||||||||||||||||||
set_monitor | Magick.set_monitor(aProc) | ||||||||||||||||||||
Description |
Establish a monitor exit block. Some (see below) RMagick methods will call the monitor event block, passing parameters that describe how much work there is to be done and how much of that work has already been accomplished. There can be at most one monitor block defined at a time. To turn off monitoring, call Magick.set_monitor(nil). The argument is a block. The block should accept 3 arguments:
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Arguments | A Proc object. | ||||||||||||||||||||
Example |
#! /usr/local/bin/ruby -w require 'RMagick' img = Magick::Image.read("images/Cheetah.jpg").first monitor = Proc.new { |text, quantum, span| printf("%s %3.0f%% complete\n", text, ((quantum/span.to_f)*100.0)) } Magick.set_monitor(monitor) img.resize!(.50) exit produces: Resize image... 0% complete Resize image... 29% complete Resize image... 57% complete Resize image... 86% complete Resize image... 100% complete |
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ImageMagick notes | The list of methods which call the monitor block is difficult to determine. The only sure way to find out is to read the ImageMagick source code. In the Image class the list includes add_noise, blur_image, channel, chop, colorize, crop, colors, despeckle, enhance, equalize, flip, flop, frame, gamma_correct, implode, level, magnify, median_filter, minify, modulate, morph, negate, normalize, oil_paint, opaque, raise, reduce_noise, resize, roll, rotate, sample, scale, segment, shade, sharpen, shear, solarize, spread, stegano, stereo, swirl, texture threshold, transparent, and wave. In the ImageList class, the list includes append, average, and montage. |
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