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DXT3 images are read in RGBA mode #8817

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Merged
merged 1 commit into from
Mar 17, 2025
Merged

DXT3 images are read in RGBA mode #8817

merged 1 commit into from
Mar 17, 2025

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radarhere
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@radarhere radarhere commented Mar 15, 2025 •
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https://pillow.readthedocs.io/en/stable/handbook/image-file-formats.html#dds

Added in version 3.4.0: DXT3 images can be read in RGB mode

This is incorrect. DXT3 images are read in RGBA mode

Pillow/src/PIL/DdsImagePlugin.py

Lines 390 to 391 in 5efcaa4

elif fourcc == D3DFMT.DXT3:
self._mode = "RGBA"

Pillow/Tests/test_file_dds.py

Lines 68 to 72 in 5efcaa4

with Image.open(TEST_FILE_DXT3) as im:
im.load()
assert im.format == "DDS"
assert im.mode == "RGBA"

This has been the case since #2068

@hugovk hugovk merged commit eec43cf into python-pillow:main Mar 17, 2025
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@radarhere radarhere deleted the typo branch March 17, 2025 21:20
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@radarhere @hugovk