Crop and resize using PIL

image.py

# Resizes images in current folder for vandanashourie.com
# Saves images into sub-folders:
#   ./tabs-square    <- 150x150 thumbnauls
#   ./full           <- 725x525 images

import os, sys
import Image
import math



def square(coordinates):
	'''
	Crops a 4-tuple into the largest center square
	e.g.:
	  In  = (0, 0, 100, 150)
	  Out = (0, 25, 100, 125)
	'''
	x0, y0, x1, y1 = coordinates
	diff = int(math.fabs(x1 - y1) / 2)
	
	if x1 > y1:
		x0 = int(diff)
		x1 = int(x1 - diff)
	else:
		y0 = int(diff)
		y1 = int(y1 - diff)
	
	return (x0, y0, x1, y1,)



listing = os.listdir(os.getcwd())

for infile in listing:
	'''
	Crop image to square, then make 150x150 thumbnail
	'''
	size = 150, 150
	outfile = "tabs-square/" + os.path.splitext(infile)[0] + ".jpg"
	
	try:
		im = Image.open(infile)
		data = im.getbbox()
		data = square(data)
		im = im.transform(size, Image.EXTENT, data)
		im.thumbnail(size, Image.ANTIALIAS)
		im.save(outfile, "JPEG")
	except IOError:
		print "Cannot create thumbnail for '%s'" % infile
	
	
	'''
	Make 725x525 image
	'''
	size = 725, 525
	outfile = "full/" + os.path.splitext(infile)[0] + ".jpg"
	
	try:
		im = Image.open(infile)
		im.thumbnail(size, Image.ANTIALIAS)
		im.save(outfile, "JPEG")
	except IOError:
		print "Cannot create smaller file for '%s'" % infile