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The pngquant PNG optimisation tool. It converts 24/32-bit PNG files to smaller, paletted PNG8 files with alpha transparency.
libPGF contains an implementation of the Progressive Graphics File (PGF). which is a new image file format, that is based on a discrete, fast wavelet transform with progressive coding features. PGF can be used for lossless and lossy compression.
We're just getting started here, so things may be a bit incomplete at the moment. Hang on, and we'll improve as we go.