Python Image Libraryで水玉模様の壁紙作成 ref: http://qiita.com/items/3623a4771a22e85839e9

wallpaper.py

# -*- coding: utf-8 -*-
from PIL import Image
from PIL import ImageDraw
import colorsys
import sys

### http://code.activestate.com/recipes/266466-html-colors-tofrom-rgb-tuples/history/2/
def RGBToHTMLColor(rgb_tuple):
    """ convert an (R, G, B) tuple to #RRGGBB """
    hexcolor = '#%02x%02x%02x' % rgb_tuple
    # that's it! '%02x' means zero-padded, 2-digit hex values
    return hexcolor

def HTMLColorToRGB(colorstring):
    """ convert #RRGGBB to an (R, G, B) tuple """
    colorstring = colorstring.strip()
    if colorstring[0] == '#': colorstring = colorstring[1:]
    if len(colorstring) != 6:
        raise(ValueError, "input #%s is not in #RRGGBB format" % colorstring)
    r, g, b = colorstring[:2], colorstring[2:4], colorstring[4:]
    r, g, b = [int(n, 16) for n in (r, g, b)]
    return (r, g, b)

def HTMLColorToPILColor(colorstring):
    """ converts #RRGGBB to PIL-compatible integers"""
    colorstring = colorstring.strip()
    while colorstring[0] == '#': colorstring = colorstring[1:]
    # get bytes in reverse order to deal with PIL quirk
    colorstring = colorstring[-2:] + colorstring[2:4] + colorstring[:2]
    # finally, make it numeric
    color = int(colorstring, 16)
    return color

def PILColorToRGB(pil_color):
    """ convert a PIL-compatible integer into an (r, g, b) tuple """
    hexstr = '%06x' % pil_color
    # reverse byte order
    r, g, b = hexstr[4:], hexstr[2:4], hexstr[:2]
    r, g, b = [int(n, 16) for n in (r, g, b)]
    return (r, g, b)

def PILColorToHTMLColor(pil_integer):
    return RGBToHTMLColor(PILColorToRGB(pil_integer))

def RGBToPILColor(rgb_tuple):
    return HTMLColorToPILColor(RGBToHTMLColor(rgb_tuple))

args = sys.argv

if(len(args) != 3):
  print("Args Error");
  print("Usage %s [BaseHLS] [SubHLS]" % args[0])
  quit()

colors = []
# 引数の解析
for arg in args[1:]:
  a = arg.split(":")
  rgb1 = colorsys.hls_to_rgb(int(a[0]) / 360, int(a[1]) / 100, int(a[2]) / 100)
  color = RGBToPILColor((rgb1[0] * 255, rgb1[1] * 255, rgb1[2] * 255))
  print("added color:", color)
  colors += [color]

img = Image.new("RGB", (100, 100), "white")
hw = img.size[0] / 2
hh = img.size[1] / 2
draw = ImageDraw.Draw(img)
for i, c in zip(range(4), colors + colors[::-1]):
  im = divmod(i, 2) 
  r = im[0] * hw
  l = im[1] * hh
  print("draw point", l, "x", r)
  draw.ellipse((l, r, l + hw, r + hh), fill=c)
img.show()