Karsten Hiddemann schrieb: > Fredrik has written something about the performance on pixel access with > some timings here: http://effbot.org/zone/pil-pixel-access.htm
As that page also mentions, PIL images have the point method for doing this kind of thing. see http://effbot.org/imagingbook/image.htm#tag-Image.Image.point It is much faster and simpler than doing it in python, and slightly more idiomatic than Image.eval (which runs the same code internally). img = Image.open("onechannel.png") better = img.point([0] + [255] * 255) better.save("bilevel.png") You could also use point to perform apply the kind of sigmoid function that Scott suggested as part of a more OCR solution. Douglas _______________________________________________ Image-SIG maillist - Image-SIG@python.org http://mail.python.org/mailman/listinfo/image-sig
