Just a small error correction. PNG does support alpha channels
in index-color mode. The alpha values can be stored in the
palette. (Read it yesterday in a libpng example file)

/ Mathias

Anthony Bennett wrote:
> PNG: developed as a patent-free alternative to GIF, the Portable Network
> Graphics (PNG) format is used for losslessly compressing and displaying
> images on the World Wide Web. Unlike GIF, PNG supports 24-bit images and
> produces background transparency without jagged edges; however, some
> older versions of Web browsers may not support PNG images. The PNG
> format supports grayscale and RGB color modes with a single alpha
> channel, and Bitmap and indexed-color modes without alpha channels. PNG
> uses the saved alpha channel to define transparency in the file.

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