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Thumbs: Update README.md

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@ -35,7 +35,7 @@
### ICC & Interop Handling
- EXIF `InteroperabilityIndex` codes we honor (per EXIF TagNames and regex.info):
- EXIF `InteropIndex` codes we honor (per EXIF TagNames and regex.info):
- `R03` → Adobe RGB (1998) compatible (`a98.icc`, etc.)
- `R98` → sRGB (assumed default; no embed)
- `THM` → Thumbnail (treated as sRGB; no embed)
@ -45,6 +45,8 @@
- `testdata/interop_index_srgb_icc.jpg` — R03 tag with embedded ICC (must remain unchanged).
- `testdata/interop_index_r98.jpg` — R98 interop tag, no ICC (should stay sRGB without embedding).
- `testdata/interop_index_thm.jpg` — THM interop tag, no ICC (thumbnail; should remain unchanged).
- Command:
- `exiftool -InteropIndex -InteropVersion -icc_profile:all -G -s filename.jpg`
- References:
- [EXIF TagNames (InteroperabilityIndex)](https://unpkg.com/exiftool-vendored.pl@10.50.0/bin/html/TagNames/EXIF.html)
- [Digital-Image Color Spaces: Recommendations and Links](https://regex.info/blog/photo-tech/color-spaces-page7)