PIL thumbnails unreasonably large

Almad bugs at almad.net
Wed May 10 10:53:49 EDT 2006


Hello,

I wonder how do I create reasonable thumbnails from JPEG with PIL.
My code:

            logging.debug('Downloading image %s' % id)
            uri = ''.join([config['photo']['masterpath'], '?p=',
str(id)])
            uf = urlopen(uri).read()
            f = tmpfile()
            f.write(uf)
            f.seek(0)
            logging.debug('Resizing image %s' % id)
            img = Image.open(f)
            prev = img.copy()
            img.thumbnail((180,180))
            if prev.size[0] > 640 or prev.size[1] > 640:
                prev.thumbnail((640,640))
            # save resized to temporary files
            f.seek(0)
            img.save(f, "JPEG", quality=50)
            fp = tmpfile()
            prev.save(fp, "JPEG", quality=200)

Well, works fine, but img size is about 0,5 MB (!), but strangely, prev
one is around 200 kb.

How do I change this? I tried to play with various quality settings,
but with no effect. img thumbnail is supposed to be < 10 kb...

Thank You, 

Almad




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