Define a maximum size. Then, compute a resize ratio by taking min(maxwidth/width, maxheight/height)
.
The proper size is oldsize*ratio
.
There is of course also a library method to do this: the method Image.thumbnail
.
Below is an (edited) example from the PIL documentation.
import os, sys import Image size = 128, 128 for infile in sys.argv[1:]: outfile = os.path.splitext(infile)[0] + ".thumbnail" if infile != outfile: try: im = Image.open(infile) im.thumbnail(size, Image.ANTIALIAS) im.save(outfile, "JPEG") except IOError: print "cannot create thumbnail for '%s'" % infile
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