All of these QOI derivatives improves upon the coding efficiency AFAIK. In QOIP, opcodes themselves are stored in the format, LZ4 or zstd compression https://

All of these QOI derivatives improves upon the coding efficiency AFAIK. In QOIP, opcodes themselves are stored in the format, LZ4 or zstd compression https://github.com/chocolate42/qoipond https://github.com/chocolate42/qoipond QOIR adds: color profile, EXIF, premultiplied alpha, lossy mode, tile support, LZ4 compression, AFAIK it does this while beating the original QOI in terms of speed AND efficiency. Lots of benchmarks in: https://github.com/nigeltao/qoir https://github.com/nigeltao/qoir QOIX is my very own version that adds: Greyscale [+alpha] 8-bit image support, lossy 10-bit support (16-bit encoded as 10-bit, intended for elevation maps), so it's really 3 codecs , optional LZ4. https://github.com/AuburnSounds/gamut https://github.com/AuburnSounds/gamut