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2024-08-31 14:00:04

QOIR (pronounced like "choir") is a simple, lossless image file format that is very fast to encode and decode while achieving compression ratios roughly comparable to PNG.

src/qoir.h is a single file C library, so there's no separate configure or build steps. Just #define QOIR_IMPLEMENTATION before you #include it.

The numbers below are the top-level summary of the full benchmarks, normalized so that QOIR is 1.000 (the full benchmarks page has raw, non-normalized numbers and links to the benchmark suite of images). For example, comparing PNG/libpng with QOIR, libpng compresses a little smaller (0.960 versus 1.000) but QOIR encodes 30x faster (0.033 versus 1.000) and decodes 4.9x faster (0.203 versus 1.000).

For example, PNG/fpng encodes faster (1.138x) than QOIR but produces larger (1.234x) files and decodes slower (0.536x) than QOIR.

For example, JPEG-XL Lossless at its default encoder options produces smaller files (0.613x) but encodes slower (0.003x) and decodes slower (0.017x) than QOIR. Inverting those last two numbers give QOIR encoding 296x faster and decoding 60x faster than JPEG-XL Lossless (using its "effort = 7" option).