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radialmonster
621dd51cbf
Lossless JPEG scans whose SOS gives predictor selection value 8 (which T.81 leaves undefined) are read as Hasselblad codes them (ljpeg::decode_hasselblad): 32-bit little-endian words read from their most significant bit, no byte stuffing; each row in pairs of samples, both Huffman categories before both differences; category 16 is followed by 16 ignored bits and means -32768; each sample is the previous sample of its column parity in the row plus the difference, modulo 2^16, both starting at 32768 on every row. Only the layout measured is accepted (one component, 16 bits, no point transform or restarts, even width); other layouts and selection values above 8 stay Unsupported. The rule was measured on 14 CC0 files with the ljpeg-explorer tool. RENDER_CACHE_VERSION 23.