#! /usr/local/bin/ruby -w require 'RMagick' # Demonstrate the Image#contrast method img = Magick::ImageList.new('images/Flower_Hat.jpg') img.resize!(0.5) # Prepare to label each image with a number from 1 to 4 legend = Magick::Draw.new legend.font_family = 'Helvetica' legend.stroke = 'transparent' legend.pointsize = 12 legend.gravity = Magick::SouthEastGravity # Add 3 images, each one having slightly less contrast f = 1 3.times { img << img.contrast # Annotate the previous image legend.annotate(img[f-1], 0,0,7,10, f.to_s) f += 1 } # Annotate the last image legend.annotate(img, 0,0,7,10, f.to_s) # Montage into a single image imgs = img.montage { self.geometry = Magick::Geometry.new(img.columns, img.rows) self.tile = "2x2" } imgs.write('contrast.jpg') #imgs.display exit