8000 Fix #5302: Proper alpha-blending for jpeg by mdboom · Pull Request #5324 · matplotlib/matplotlib · GitHub
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Fix #5302: Proper alpha-blending for jpeg #5324

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Merged
merged 5 commits into from
Oct 28, 2015
Merged

Fix #5302: Proper alpha-blending for jpeg #5324

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bdea63d
Fix #5302: Proper alpha-blending for jpeg
mdboom Oct 26, 2015
3dea66d
Get background color from savefig.facecolor
mdboom Oct 27, 2015
183f246
Fix test
mdboom Oct 27, 2015
737da1e
Add prints to test
mdboom Oct 27, 2015
fb6ff8a
Adjust acceptable range
mdboom Oct 28, 2015
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Add prints to test
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@mdboom
mdboom committed Oct 27, 2015
commit 737da1e59a8fe55e8f0901d9d2561af890ee07a1
2 changes: 2 additions & 0 deletions lib/matplotlib/tests/test_image.py
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Expand Up @@ -473,9 +473,11 @@ def test_jpeg_alpha():

# If this fails, there will be only one color (all black). If this
# is working, we should have all 256 shades of grey represented.
print("num colors: ", len(image.getcolors(256)))
assert len(image.getcolors(256)) >= 170 and len(image.getcolors(256)) <= 180
# The fully transparent part should be red, not white or black
# or anything else
print("corner pixel: ", image.getpixel((0, 0)))
assert image.getpixel((0, 0)) == (254, 0, 0)


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