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Code Issues Projects Releases Packages Wiki Activity Actions 12

LibGfx: Fix colour with Photoshop JPEG files using CMYK

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This is based on the original functionality Lucus wrote prior to using
libjpeg.

Co-authored-by: Lucas CHOLLET <lucas.chollet@free.fr>
This commit is contained in:
Jamie Mansfield 2025-08-14 00:48:33 +01:00 • committed by Jelle Raaijmakers
commit 97746fb574
Notes: github-actions[bot] 2025-08-20 10:05:41 +00:00
1 changed files with 18 additions and 0 deletions
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18
Libraries/LibGfx/ImageFormats/JPEGLoader.cpp
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@ -145,6 +145,24 @@ ErrorOr<void> JPEGLoadingContext::decode()
}
}
}
// Photoshop writes inverted CMYK data (i.e. Photoshop's 0 should be 255). We convert this
// to expected values.
if (cinfo.saw_Adobe_marker) {
for (int i = 0; i < cmyk_bitmap->size().height(); ++i) {
auto* line = cmyk_bitmap->scanline(i);
for (int j = 0; j < cmyk_bitmap->size().width(); ++j) {
auto const& cmyk = line[j];
line[j] = {
static_cast<u8>(255 - cmyk.c),
static_cast<u8>(255 - cmyk.m),
static_cast<u8>(255 - cmyk.y),
static_cast<u8>(255 - cmyk.k),
};
}
}
}
}
JOCTET* icc_data_ptr = nullptr;