Convert grayscale images in 3 channel images

thanks to  naila.murray@gmail.com


#!/usr/bin/env python
# naila.murray@gmail.com

from PIL import Image
import sys

if len(sys.argv) < 2:
    import os
    print 'usage: %s input_img output_img' % os.path.basename(sys.argv[0])
    quit()

# open image:
imgname = sys.argv[1]
img = Image.open(imgname)

# create RGB image:
if img.mode == "L":
    print "image is grayscale"
    img_rgb = Image.merge("RGB",(img,img,img))
    img_rgb.save(sys.argv[2])

elif img.mode == "RGB":
    print "image is RGB"