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Pad COLORMAP to 768 items

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This commit is contained in:
Andrew Murray 2022-04-21 11:26:34 +10:00
parent c6637bc4de
commit 1e3fdb3055
2 changed files with 8 additions and 3 deletions
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4
Tests/test_file_libtiff.py
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@ -497,8 +497,8 @@ class TestFileLibTiff(LibTiffTestCase):
im.save(out, compression="tiff_adobe_deflate") im.save(out, compression="tiff_adobe_deflate")
assert_image_equal_tofile(im, out) assert_image_equal_tofile(im, out)
def test_palette_save(self, tmp_path): @pytest.mark.parametrize("im", (hopper("P"), Image.new("P", (1, 1), "#000")))
im = hopper("P") def test_palette_save(self, im, tmp_path):
out = str(tmp_path / "temp.tif") out = str(tmp_path / "temp.tif")
TiffImagePlugin.WRITE_LIBTIFF = True TiffImagePlugin.WRITE_LIBTIFF = True

7
src/PIL/TiffImagePlugin.py
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@ -1676,7 +1676,12 @@ def _save(im, fp, filename):
if im.mode in ["P", "PA"]: if im.mode in ["P", "PA"]:
lut = im.im.getpalette("RGB", "RGB;L") lut = im.im.getpalette("RGB", "RGB;L")
ifd[COLORMAP] = tuple(v * 256 for v in lut) colormap = []
colors = len(lut) // 3
for i in range(3):
colormap += [v * 256 for v in lut[colors * i : colors * (i + 1)]]
colormap += [0] * (256 - colors)
ifd[COLORMAP] = colormap
# data orientation # data orientation
stride = len(bits) * ((im.size[0] * bits[0] + 7) // 8) stride = len(bits) * ((im.size[0] * bits[0] + 7) // 8)
# aim for given strip size (64 KB by default) when using libtiff writer # aim for given strip size (64 KB by default) when using libtiff writer