Well not much maths in my answers but... On 24 Nov, 08:52, amine <[EMAIL PROTECTED]> wrote: > well, here is the background. I have images of objects (cars, > clothes, ...) with a white background in most of the cases > > I have to build a function with PIL that takes away the background. > it seems simple, just look for the "white" and make it transparent but > the problem is in reality much more complex: > 1) the image could contain some white inside the object (e.g. shoes > with some white in between straps)
A simple solution would be to start with a transparent pixel in the top left corner say, then scan the image from left to right (line by line): if the current pixel is white (or pale enough) and has a transparent pixel above it or to its left, then make it transparent. I remember when I was a kid playing graphical adventure games on my C64, you could actually see this happening as the picture was being built on the screen (as a floppy could only contain around 160k, you couldn't store bitmaps unless you had very few pictures). > 2) there are often pixels that are part of the background but have a > colour different from white which leaves a few points throughout the > image What you're doing is fine I think: calculate the distance to white. HTH -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
