LibGfx/TIFF: Support WhiteIsZero parameter for grayscale images

PhotometricInterpretation::WhiteIsZero is used to inverse black and white on bilevel and grayscale images.
Author: https://github.com/LucasChollet Commit: 3ae29fdeec Pull-request: https://github.com/SerenityOS/serenity/pull/22207 Reviewed-by: https://github.com/nico ✅
2025-08-10 10:09:14 +00:00 · 2023-12-01 19:29:55 -05:00 · 2023-12-01 19:29:55 -05:00 · 3ae29fdeec · 2024-07-16 21:42:29 +09:00
commit 3ae29fdeec
parent 64d7e386d2
1 changed files with 5 additions and 1 deletions
--- a/Userland/Libraries/LibGfx/ImageFormats/TIFFLoader.cpp
+++ b/Userland/Libraries/LibGfx/ImageFormats/TIFFLoader.cpp
@ -97,7 +97,11 @@ private:
        }

        if (*m_metadata.samples_per_pixel() == 1) {
-            auto const luminosity = TRY(read_component(stream, bits_per_sample[0]));
+            auto luminosity = TRY(read_component(stream, bits_per_sample[0]));
+
+            if (m_metadata.photometric_interpretation() == PhotometricInterpretation::WhiteIsZero)
+                luminosity = ~luminosity;
+
            return Color(luminosity, luminosity, luminosity);
        }