#!/usr/bin/python
# Isaias Gonzalez <siderevs [at] gmail.com>
from PIL import Image
import sys
import os

def makehistogram(filename, outfilename):
    img = Image.open(filename).convert("L")
    liH = img.histogram()
    maxval = max(liH)
    hist = Image.new("L", (256, 60),256)

    for i in range(256):
      #normalization
      y = liH[i]*50/maxval
      #give an up and bottom padding of 5
      y = 55 - y
      hist.putpixel((i,y),0)

    hist.show()
    hist.save(outfilename)

if __name__ == "__main__":
    if len(sys.argv) != 3:
        sys.exit("Usage: %s <inputimage> <outputimage>"
                 % os.path.basename(sys.argv[0]))
    makehistogram(*sys.argv[1:])