8000 Correct drawing I;16 horizontal lines by radarhere · Pull Request #8985 · python-pillow/Pillow · GitHub
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Correct drawing I;16 horizontal lines #8985

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Correct drawing I;16 horizontal lines #8985

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Currently, I;16 horizontal lines draw the same value to both 8-bit parts, rather than using the full 16 bits.

Pillow/src/libImaging/Draw.c

Lines 121 to 124 in 5a04b95

pixelwidth = strncmp(im->mode, "I;16", 4) == 0 ? 2 : 1;
memset(
im->image8[y0] + x0 * pixelwidth, (UINT8)ink, (x1 - x0 + 1) * pixelwidth
);

@radarhere radarhere changed the title Correct drawing I;16 lines Correct drawing I;16 horizontal lines May 30, 2025
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