qoi

QOI is fast. It losslessly compresses images to a similar size of PNG,
while offering 20x-50x faster encoding and 3x-4x faster decoding.
QOI is simple. The reference en-/decoder fits in about 300 lines of C.
The file format specification is a single page PDF.

          

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License: MIT
URL: https://github.com/phoboslab/qoi