Resize Images in Python

image_resize.py

#!/usr/bin/env python
# This is intended as a quick and dirty image resizer.  It doesn't even check to see if the filename is already in use.  I 
# don't suggest it for production use without changes.
# Stashing it here for future improvements.

import Image
import sys
import os

def resize_image_width_ratio(filename, new_filename, max_width=800):
	image = False
	try:
		image = Image.open(filename)
	except:
		return False
	
	width,height = image.size
	ratio = 1

	if width > max_width:
		ratio = float(width) / float(max_width)
	
	new_width = int(float(width) / ratio)
	new_height = int(float(height) / ratio)
	img = image.resize((new_width, new_height), Image.ANTIALIAS)

	out = file(new_filename, "w")
	try:
		img.save(out, "PNG")
	finally:
		out.close()
	
	return True

def main():
	filename, extention = os.path.splitext(sys.argv[1])
	thumb = filename + "_jbmthumb.png"
	resize_image_width_ratio(sys.argv[1], thumb, 100)




#This idiom means the below code only runs when executed from command line
if __name__ == '__main__':
    main()
# Rename all files under a directory
# find . -name "*.jpg" -exec image_resize.py {} \;

# Incidentally, if you are on a mac and cannot install PIL:
# You need to set the GCC environmental variable.
# sudo su
# export ARCHFLAGS="-arch i386 -arch x86_64#
# easy_install pip
# pip install pil
# 
# That was 45-50 minutes of desperate googling FYI.