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Delete transparency info when convert'ing RGB/L to RGBA

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info['transparency] was not removed when an RGB or L image
was converted to RGBA. This could result in unexpected behavior
when saving the resulting image.

Other image conversions already delete or update the transparency
info. There is a shortcut for RGB/L to RGBA which missed this.
This commit is contained in:
Oliver Tonnhofer 2017-07-18 15:00:09 +02:00
parent 0cd84cf9b3
commit 9e7de70bac
2 changed files with 7 additions and 1 deletions
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4
PIL/Image.py
View File

@ -877,8 +877,10 @@ class Image(object):
if self.mode in ('L', 'RGB') and mode == 'RGBA':
# Use transparent conversion to promote from transparent
# color to an alpha channel.
return self._new(self.im.convert_transparent(
new_im = self._new(self.im.convert_transparent(
mode, self.info['transparency']))
del(new_im.info['transparency'])
return new_im
elif self.mode in ('L', 'RGB', 'P') and mode in ('L', 'RGB', 'P'):
t = self.info['transparency']
if isinstance(t, bytes):

4
Tests/test_image_convert.py
View File

@ -122,6 +122,10 @@ class TestImageConvert(PillowTestCase):
self.assertIn('transparency', p.info)
p.save(f)
p = im.convert('RGBA')
self.assertNotIn('transparency', p.info)
p.save(f)
p = self.assert_warning(
UserWarning,
lambda: im.convert('P', palette=Image.ADAPTIVE))