premultiplied-alpha

Looking for some kind of simple tool or process for Windows that will let me convert one or more standard PNGs to premultiplied alpha. Command line tools are ideal; I have easy access to PIL (Python Imaging Library) and Imagemagick, but will install another tool if it makes life easier. Thanks! I just released a bit of code in Python and in C that does what you are looking for. It's on github: http://github.com/maxme/PNG-Alpha-Premultiplier The Python version is based on the cssndrx response. C version is based on libpng. A more complete version of the cssndrx answer, using slicing in numpy to