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Add mode to ImageOps._lut() error message #7490

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merged 4 commits into from
Oct 27, 2023
Merged

Add mode to ImageOps._lut() error message #7490

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ef46608
add mode to error message
Yay295 Oct 24, 2023
f54dd84
Test unsupported autocontrast mode
radarhere Oct 24, 2023
6ddf10c
use format string instead of concatenation
Yay295 Oct 24, 2023
5295df3
add test for autocontrast mode
Yay295 Oct 24, 2023
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6 changes: 6 additions & 0 deletions Tests/test_imageops.py
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Original file line number Diff line number Diff line change
Expand Up @@ -433,6 +433,12 @@ def test_exif_transpose_in_place():
assert_image_equal(im, expected)


def test_autocontrast_unsupported_mode():
im = Image.new("RGBA", (1, 1))
with pytest.raises(OSError):
ImageOps.autocontrast(im)


def test_autocontrast_cutoff():
# Test the cutoff argument of autocontrast
with Image.open("Tests/images/bw_gradient.png") as img:
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2 changes: 1 addition & 1 deletion src/PIL/ImageOps.py
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Expand Up @@ -56,7 +56,7 @@ def _lut(image, lut):
lut = lut + lut + lut
return image.point(lut)
else:
msg = "not supported for this image mode"
msg = f"not supported for mode {image.mode}"
raise OSError(msg)


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