#!/usr/bin/ruby -w #=======================================================# # Thanks to Robert Wagner for the idea of allowing a # # GravityType instead of the x- and y-offset arguments! # #=======================================================# # Demo the use of the GravityType argument to Image#crop. require 'RMagick' include Magick shorts = Image.read('images/Shorts.jpg').first shorts.resize!(250.0/shorts.rows) regwidth = shorts.columns/2 regheight = shorts.rows/2 mask = Image.new(regwidth, regheight) { self.background_color = 'white'} mask.opacity = 0.50 * TransparentOpacity black = Image.new(shorts.columns, shorts.rows) {self.background_color = 'black'} pairs = ImageList.new [NorthWestGravity, NorthGravity, NorthEastGravity, WestGravity, CenterGravity, EastGravity, SouthWestGravity, SouthGravity, SouthEastGravity].each do |gravity| pattern = shorts.composite(mask, gravity, OverCompositeOp) cropped = shorts.crop(gravity, regwidth, regheight) result = black.composite(cropped, gravity, OverCompositeOp) result.border_color = "white" pairs << pattern pairs << result end # Montage into a single image montage = pairs.montage { self.geometry = "#{pairs.columns}x#{pairs.rows}+0+0" self.tile = "6x3" self.border_width = 1 } montage.write('crop_with_gravity.miff') #montage.display