Felix Bünemann d9d2f7b89a Add 8bpp PNG quantization support
This adds support for saving 8-Bit one band palette based PNG images
with palette based alpha channel (often called PNG8+Alpha).

The image is first converted to sRGBA and then quantized using
libimagequant controlled by the colors, Q and dither params.
2018-06-18 02:22:46 +02:00
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