QOI, the Quite OK Image format,has been gaining in popularity. Chris Wellons offers a great analysis.QOI's key advantages is its simplicity. Being a byte-oriented formatwithout entropy encoding, it can be further compressed with generic datacompression programs like lz4, xz, and zstd. PNG, on the other hand,uses DEFLATE compression internally and is typically resistant tofurther compression. By applying a stronger compression algorithm on QOIoutput, you can often achieve a smaller file size compared to PNG.Lasse Collin has shared some effective options for compressinguncompressed BMP/TIFF file
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