Pseudorandom number generator image

require('GD')

var img = %O<GD::Image>.new(500, 500, 1)

for y in (0..500), x in (0..500) {
    var color = img.colorAllocate(255.irand, 255.irand, 255.irand)
    img.setPixel(x, y, color)
}

File("image500.png").write(img.png, :raw)