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Contents
#!/usr/bin/env ruby -w
require 'rmagick'
# Demonstrate the ImageListImage#quantize method by converting
# a color image into a monochrome image.
# Read the large color cheetah image and scale it to a third
# of its size.
cheetah = Magick::Image.read('images/Cheetah.jpg').first
cheetah.scale!(0.33)
# Quantize the cheetah image into 256 colors in the GRAY colorspace.
mono_cheetah = cheetah.quantize 256, Magick::GRAYColorspace
# Cut the top off the monochrome cheetah image.
mono_bottom = mono_cheetah.crop 0, mono_cheetah.rows/2, mono_cheetah.columns, mono_cheetah.rows/2
# Composite the half-height mono cheetah onto the bottom of
# the original color cheetah.
before_after = cheetah.composite mono_bottom, 0, cheetah.rows/2, Magick::OverCompositeOp
before_after.write 'mono.jpg'
exit
Version data entries
13 entries across 13 versions & 3 rubygems