colorKey???.rb

require "dxruby"

f = Fiber.new do
  loop do
    8.times do
      Fiber.yield 0    # alpha 透明度, ０は透明。試すなら128（半透明）が分かりやすい
      Fiber.yield 255  # red
      Fiber.yield 0    # green
      Fiber.yield 0    # blue
    end
    8.times do
      Fiber.yield 255
      Fiber.yield 0
      Fiber.yield 255
      Fiber.yield 0
    end
  end
end

ary = Array.new(32 * 32 * 4){ f.resume}

image = Image.createFromArray(32, 32, ary)

Window.loop{Window.draw(0,0,image)} #これは無限ループ

image.save("C:\\test.PNG")