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Commitafa6123

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committed
add test for alpha channel interpolation
1 parent35fe0a6 commitafa6123

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7 files changed

+55
-44
lines changed

7 files changed

+55
-44
lines changed

‎lib/matplotlib/image.py

Lines changed: 7 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -493,21 +493,23 @@ def _make_image(self, A, in_bbox, out_bbox, clip_bbox, magnification=1.0,
493493
alpha=1
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495495
#resample alpha channel
496-
alpha_channel=A[...,3]
496+
alpha_channel=A[...,3]
497497
_image.resample(
498-
alpha_channel,output_a,t,_interpd_[self.get_interpolation()],
498+
alpha_channel,output_a,t,
499+
_interpd_[self.get_interpolation()],
499500
self.get_resample(),alpha,
500501
self.get_filternorm(),self.get_filterrad())
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502503
#resample rgb channels
503-
A=_rgb_to_rgba(A[...,:3])
504+
A=_rgb_to_rgba(A[...,:3])
504505
_image.resample(
505-
A,output,t,_interpd_[self.get_interpolation()],
506+
A,output,t,
507+
_interpd_[self.get_interpolation()],
506508
self.get_resample(),alpha,
507509
self.get_filternorm(),self.get_filterrad())
508510

509511
#recombine rgb and alpha channels
510-
output[...,3]=output_a
512+
output[...,3]=output_a
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512514
# at this point output is either a 2D array of normed data
513515
# (of int or float)
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‎lib/matplotlib/tests/baseline_images/test_image/image_composite_alpha.svg

Lines changed: 34 additions & 39 deletions
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‎lib/matplotlib/tests/test_image.py

Lines changed: 14 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -43,6 +43,20 @@ def test_image_interps():
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ax3.set_ylabel('bicubic')
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4545

46+
@image_comparison(baseline_images=['interp_alpha'],
47+
extensions=['png'],remove_text=True)
48+
deftest_alpha_interp():
49+
'Test the interpolation of the alpha channel on RGBA images'
50+
fig, (axl,axr)=plt.subplots(1,2)
51+
# full green image
52+
img=np.zeros((5,5,4))
53+
img[...,1]=np.ones((5,5))
54+
# transparent under main diagonal
55+
img[...,3]=np.tril(np.ones((5,5),dtype=np.uint8))
56+
axl.imshow(img,interpolation="none")
57+
axr.imshow(img,interpolation="bilinear")
58+
59+
4660
@image_comparison(baseline_images=['interp_nearest_vs_none'],
4761
extensions=['pdf','svg'],remove_text=True)
4862
deftest_interp_nearest_vs_none():

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