codebrawl2

4bit_b.png

4bit_g.png

4bit_r.png

8bit.png

brawl2.rb

require 'chunky_png'
include ChunkyPNG

#   ten by ten pixles?
# might as well go 8 bit
#   while we are at it

def reduce_depth(color, bits)
  Color.rgb(*Color.to_truecolor_bytes(color).
    map{ |c| c.to_f/256 }.each_with_index.map { |c,i|
      (256.0 * (c*bits[i]).round / bits[i]).to_i
    })
end

def reduce_image(output, bits)
  image = Image.from_file('input.png')
  (0..image.width-1).step(10).each do |x|
    (0..image.height-1).step(10).each do |y|
      color = reduce_depth image[x,y], bits
      10.times {|i| 10.times {|j|
        image.set_pixel_if_within_bounds x+i, y+j, color
      }}
    end
  end
  image.save("#{output}.png")
end

reduce_image "8bit",   [8,8,4]
reduce_image "4bit_r", [4,2,2]
reduce_image "4bit_g", [2,4,2]
reduce_image "4bit_b", [2,2,4]