1:#!/usr/bin/python
   2:# Isaias Gonzalez <siderevs [at] gmail.com>
   3:from PIL import Image
   4:import sys
   5:import os
   6:
   7:def makehistogram(filename, outfilename):
   8:    img = Image.open(filename).convert("L")
   9:    liH = img.histogram()
  10:    maxval = max(liH)
  11:    hist = Image.new("L", (256, 60),256)
  12:
  13:    for i in range(256):
  14:      #normalization
  15:      y = liH[i]*50/maxval
  16:      #give an up and bottom padding of 5
  17:      y = 55 - y
  18:      hist.putpixel((i,y),0)
  19:
  20:    hist.show()
  21:    hist.save(outfilename)
  22:
  23:if __name__ == "__main__":
  24:    if len(sys.argv) != 3:
  25:        sys.exit("Usage: %s <inputimage> <outputimage>"
  26:                 % os.path.basename(sys.argv[0]))
  27:    makehistogram(*sys.argv[1:])