#!/usr/bin/ruby -w require 'RMagick' # Demonstrate the Image#gaussian_blur method lighthouse = Magick::Image.read('images/Lighthouse.jpg').first # Crop to the interesting part of the picture. lighthouse.crop!(202, 184, 206, 230) # Make a blurry copy blurry = lighthouse.gaussian_blur(0.0, 3.0) # Copy the copy, retaining only the right half. blurry.crop!(blurry.columns/2, 0, blurry.columns/2, blurry.rows) # Composite the copy over the right half of the original. result = lighthouse.composite(blurry, Magick::EastGravity, Magick::OverCompositeOp) # Draw a black line between the before and after parts. line = Magick::Draw.new line.stroke('white') line.line(lighthouse.columns/2, 0, lighthouse.columns/2, lighthouse.rows) line.draw(result) #result.display result.write('gaussian_blur.jpg') exit