>> I expected the pixels to be increasingly dark. However, the order >> seems to be: ...white -> light gray -> dark gray -> black -> *very >> dark gray?!* -> black... > > What you are seeing sounds like ringing artifacts from the lanczos > resampling of the ANTIALIAS mode (see > http://en.wikipedia.org/wiki/Lanczos_resampling ). > >> Is this intentional or not? If intentional, is there another way to >> anti-alias edges with PIL (because I don't like these artifacts)? > > You could try something like this: > > im = im._new(im.im.stretch((15,10), Image.BILINEAR)) > > This will try to do an anti-aliased resizing, but use a bilinear filter > instead of the default lanczos filter. This will potentially have more > aliasing artifacts, but should have no ringing at all. > > till then, David.
That works perfectly for me! Thanks a lot! Interesting explanation too. When I have some more free time I'll have to look deeper at the math behind these filters. _______________________________________________ Image-SIG maillist - Image-SIG@python.org http://mail.python.org/mailman/listinfo/image-sig
