#!/usr/bin/ruby -w require 'RMagick' img = Magick::Image.read('images/Flower_Hat.jpg').first imgs = Magick::ImageList.new imgs << img imgs << img.channel(Magick::RedChannel) imgs.cur_image['Label'] = 'RedChannel' imgs << img.channel(Magick::GreenChannel) imgs.cur_image['Label'] = 'GreenChannel' imgs << img.channel(Magick::BlueChannel) imgs.cur_image['Label'] = 'BlueChannel' result = imgs.montage { self.tile = "2x2" self.background_color = 'black' self.stroke = 'transparent' self.fill = 'white' self.pointsize =9 self.geometry = Magick::Geometry.new(img.columns/2, img.rows/2, 5, 5) } result.write('channel.jpg')