1.6 (2013) Binary for Windows 32/64 (no DLLs)
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Tested successfully on Windows 7 64 bits, compiled with libpng 1.6.3 and zlib 1.2.8.
[EDIT - Better optimization] : http://css-ig.net/tools/zip/posterize16.zip
kornelski / mediancut-posterizer
Lossy PNG compressor for RGBA PNGs. Has two modes: lossy averaging filter (blurizer) that denoises the image and optimal posterization using Median Cut quantization to reduce number of unique colors in the image with minimal visual distortion