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Issue #85: Raw: CR2 colour pattern from the file's CR2CFAPattern tag, not a constant

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The Bayer layout of Canon CR2 files differs by model (GBRG on the 7D, 50D,
60D, 550D, 600D, 1200D, 1300D, 5D Mark II, 1D Mark IV; RGGB on the 40D,
5D Mark III, 6D, 5DS R and others). Read it from raw IFD tag 0xc5e0
(CR2CFAPattern: 1 RGGB, 2 BGGR, 3 GBRG, 4 GRBG), anchored at the full
decoded sensor; fall back to RGGB when the tag is missing. No model table.

Checked on 35 decoded CC0 raw.pixls.us CR2s (35 models): the tag agrees
with the mosaic's green-diagonal statistic on every file; the SensorInfo
border parity does not predict the layout. Corpus manifest gains the
reporter's samples; a corpus test asserts each layout.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Brandon Thomas
2026-10-05 07:24:26 -04:00
co-authored by Claude Opus 5.5
parent 92bd3aa688
commit e87ee8e36d
5 changed files with 92 additions and 2 deletions
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xtask/src/main.rs
+7
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@@ -234,6 +234,13 @@ const RAW_SAMPLES: &[(&str, &str)] = &[
("arw-sony-a7m4-lossless-l.arw", "https://raw.pixls.us/data/Sony/ILCE-7M4/ILCE-7M4_DSC06674_FullFrame-LossLess-Compressed-Large.ARW"),
("arw-sony-a7m4-lossless-m.arw", "https://raw.pixls.us/data/Sony/ILCE-7M4/ILCE-7M4_DSC06675_FullFrame-LossLess-Compressed-Medium.ARW"),
("arw-sony-a7m4-lossless-s.arw", "https://raw.pixls.us/data/Sony/ILCE-7M4/ILCE-7M4_DSC06676_FullFrame-LossLess-Compressed-Small.ARW"),
// CR2 colour-filter layouts differ by model (issue #85): CR2CFAPattern 3 (GBRG) and 1 (RGGB) samples
("cr2-canon-40d.cr2", "https://raw.pixls.us/data/Canon/EOS%2040D/_MG_0153.CR2"),
("cr2-canon-550d.cr2", "https://raw.pixls.us/data/Canon/EOS%20550D/IMG_4047.CR2"),
("cr2-canon-5d2.cr2", "https://raw.pixls.us/data/Canon/EOS%205D%20Mark%20II/08.canon.raw.cr2"),
("cr2-canon-5dsr.cr2", "https://raw.pixls.us/data/Canon/EOS%205DS%20R/_DSR2002.CR2"),
("cr2-canon-6d.cr2", "https://raw.pixls.us/data/Canon/EOS%206D/EOS_6D_RAW.CR2"),
("cr2-canon-7d.cr2", "https://raw.pixls.us/data/Canon/EOS%207D/RAW_CANON_EOS_7D-raw.CR2"),
("cr2-canon-5d3-sraw2.cr2", "https://raw.pixls.us/getfile.php/773/nice/Canon%20-%20EOS%205D%20Mark%20III%20-%20sRAW2%20%28sRAW%29.CR2"),
("cr2-canon-5d3.cr2", "https://raw.pixls.us/getfile.php/771/nice/Canon%20-%20EOS%205D%20Mark%20III.CR2"),
("cr2-canon-80d.cr2", "https://raw.pixls.us/getfile.php/1294/nice/Canon%20-%20EOS%2080D%20-%20RAW%20%283:2%29.CR2"),