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Clip F resampling to prevent negative values

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This commit is contained in:
Andrew Murray 2023-06-05 23:26:11 +10:00
parent 9a560c78a8
commit 4924a59f42
2 changed files with 10 additions and 0 deletions
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7
Tests/test_image_resize.py
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@ -281,6 +281,13 @@ class TestImageResize:
im = hopper(mode) im = hopper(mode)
assert im.resize((20, 20), Image.Resampling.BICUBIC) == im.resize((20, 20)) assert im.resize((20, 20), Image.Resampling.BICUBIC) == im.resize((20, 20))
def test_bicubic_f_clipping(self):
im = Image.new("F", (1, 2))
im.putpixel((0, 1), 1)
im = im.resize((1, 3), Image.BICUBIC)
assert im.getpixel((0, 0)) >= 0
@pytest.mark.parametrize( @pytest.mark.parametrize(
"mode", ("1", "P", "I;16", "I;16L", "I;16B", "BGR;15", "BGR;16") "mode", ("1", "P", "I;16", "I;16L", "I;16B", "BGR;15", "BGR;16")
) )

3
src/libImaging/Resample.c
View File

@ -535,6 +535,9 @@ ImagingResampleVertical_32bpc(
for (y = 0; y < ymax; y++) { for (y = 0; y < ymax; y++) {
ss += IMAGING_PIXEL_F(imIn, xx, y + ymin) * k[y]; ss += IMAGING_PIXEL_F(imIn, xx, y + ymin) * k[y];
} }
if (ss < 0) {
ss = 0;
}
IMAGING_PIXEL_F(imOut, xx, yy) = ss; IMAGING_PIXEL_F(imOut, xx, yy) = ss;
} }
} }