reduce the amount of colors in an image

less_color.py

#! /usr/bin/python
import Image

source = Image.open("test.jpg")
img = source.load()

width = source.size[0]
height = source.size[1]

reduction_factor =50 #  Higher number means less color
for y in xrange(0, height):
  for x in xrange(0, width):
		img[x, y] = (img[x,y][0] - (img[x, y][0] % reduction_factor), img[x, y][1] - (img[x, y][1] % reduction_factor), img[x, y][2] - (img[x, y][2] % reduction_factor))

source.save("less3.png")