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Contents
#! /usr/local/bin/ruby -w
require 'RMagick'
# Demonstrate the Image#level_channel method
before = Magick::Image.read('images/Flower_Hat.jpg').first
# Let the final argument default
begin
red = before.level_channel(Magick::RedChannel, Magick::MaxRGB, 2)
green = before.level_channel(Magick::GreenChannel,Magick::MaxRGB, 2)
blue = before.level_channel(Magick::BlueChannel, Magick::MaxRGB, 2)
# Composite the green image over the middle of the red image.
# Composite the blue image over the right-hand side of the red image.
green.crop!(red.columns/3, 0, red.columns/3, red.rows)
blue.crop!(red.columns/3*2+1, 0, red.columns/3+1, red.rows)
result = red.composite(green, Magick::CenterGravity, Magick::OverCompositeOp)
result = result.composite(blue, Magick::EastGravity, Magick::OverCompositeOp)
# Draw a black line between each of the three images.
line = Magick::Draw.new
line.line(result.columns/3, 0, result.columns/3, result.rows)
line.line(result.columns/3*2+1, 0, result.columns/3*2+1, result.rows)
line.draw(result)
# Substitute the standard "Not Implemented" image
rescue NotImplementedError
result = Magick::Image.read("images/notimplemented.gif").first
end
result.write('level_channel.jpg')
exit
Version data entries
18 entries across 18 versions & 1 rubygems