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[io] Scale a 16-bit image to 8 bits in read_img_as_tensor and decode_img_as_tensor - #2217
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #2217 +/- ##
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- Coverage 97.79% 97.77% -0.02%
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Files 170 170
Lines 10997 10999 +2
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Hits 10754 10754
- Misses 243 245 +2
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felixdittrich92
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Nov 6, 2026
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Thanks @RavSinghChandan 👍
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type: enhancement
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A 16-bit grayscale PNG (Pillow mode
I;16) was read as almost all white byread_img_as_tensoranddecode_img_as_tensor: Pillow'sconvert("RGB")clips each value to 255 instead of scaling it, so every pixel above 255 out of 65535 became white.read_img_as_numpy(throughcv2.imdecode) scales them to 8 bits instead, and the datasets load their images withread_img_as_tensor.The 16-bit values are now shifted to 8 bits like
cv2.imdecodedoes, and both readers give the same pixels. Test added (fails on main).