dataviz.py

import Image, ImageDraw, struct, sys, os


if len(sys.argv) != 3:
  print "dataviz.py for.exe bar.png"
  os._exit(1)

size = ( 256, 256 )          
im   = Image.new( 'RGB', size )
draw = ImageDraw.Draw( im )

with open(sys.argv[1], "rb") as f:
    x = struct.unpack('B', f.read(1))[0]
    y = struct.unpack('B', f.read(1))[0]
    
    while True:
      try:
        r, g, b = im.getpixel( (x, y) )
        
        if   r < 255:
          draw.point((x, y), fill=( r+2, g, b))
        elif g < 255:
          draw.point((x, y), fill=( r, g+2, b))
        else: 
          draw.point((x, y), fill=( r, g, b+2))
        
        x = y
        y = struct.unpack('B', f.read(1))[0]
      except Exception, e:
        break
        
          
del draw 
im.save( sys.argv[2], "PNG")


raw_input("Press Enter to continue...")