rgb2hex.py

from __future__ import division
from PIL import Image, ImageColor
import re

color_map = { '10':'A', '11':'B', '12':'C', '13':'D', '14':'E', '15':'F' }

def get_parts(number):
  parts = re.match("^([0-9]+)\.([0-9]+)", str(number))
  return (parts.group(1), parts.group(2))

def get_hex(rgb_tuple):
  hex_string = ''
  for color in rgb_tuple:
    quotient = str(color / 16)
    first_a, first_b = get_parts(quotient)
    second_a, second_b = get_parts(float("0." + first_b) * 16)
    if color_map.has_key(first_a): 
      hex_string += color_map[first_a]
    else: 
      hex_string += first_a
    if color_map.has_key(second_a): 
      hex_string += color_map[second_a]
    else: 
      hex_string += second_a
  return hex_string