#!/usr/bin/python

# usage: image_to_dcf.py myimage.png
# minimal program to write any image in a form that is suitable for
# viewing on a cybershot -- proof of concept only, no warranty ...
# ewan_at_mathcode_dot_net

# This python program is based originally the comments above.
# Version 2 - Chieh Cheng
# Changes from version 1:
# 1. check for valid input file name
# 2. allow arbitrary number of files on the command-line
# 3. add usage text

import Image
import os
import sys

def usage ():
  print '  Usage: DCF.py "image 1" [ . . . "image n" ]'

def padZeros (num):
  result = ""
  if num < 1000:
    result = result + "0"
  if num < 100:
    result = result + "0"
  if num < 10:
    result = result + "0"
  result = result + str (num)
  return result

def getUniqueName ():
  count = 1
  name = 'DCF_' + padZeros (count) + '.JPG'
  while os.path.isfile (name):
    count = count + 1;
    name = 'DCF_' + padZeros (count) + '.JPG'
  return name

argc = len (sys.argv)

for i in range (1, argc):
  filename = sys.argv [i]
  if os.path.isfile (filename):
    im = Image.open(filename)
    oim = im.copy()
    oim = im.convert('YCbCr')
    oim.mode = 'YCbCr'
    outfile = getUniqueName ()
    oim.save(outfile, 'JPEG', quality=100)
  else:
    print filename, "does not exist!"

if argc == 1:
  usage ()