Fix TIFF decoding of legacy 8-bit color maps - #3189
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This was referenced Sep 14, 2026
This was referenced Sep 15, 2026
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Description
Fixes #3182
Fixes near-black TIFF output when
ColorMapentries use the legacy 0–255 range. Uses SIMD-backed range detection to select the correct palette scaling and adds synthetic regression coverage for both 8-bit and 16-bit color maps.