8000 Fix image alpha by mdboom · Pull Request #6659 · matplotlib/matplotlib · GitHub
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Fix image alpha #6659

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Merged
merged 3 commits into from
Jun 29, 2016
Merged

Fix image alpha #6659

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22806ae
Fix image alpha in PNG backend
mdboom Jun 28, 2016
fde4e63
Update test images
mdboom Jun 28, 2016
283c352
Update image_composite_alpha test
mdboom Jun 28, 2016
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Fix image alpha in PNG backend
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@mdboom
mdboom committed Jun 28, 2016
commit 22806ae919dceef4665bac31dfee69b7c712da5d
7 changes: 5 additions & 2 deletions lib/matplotlib/tests/test_image.py
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Expand Up @@ -176,10 +176,13 @@ def test_image_alpha():
np.random.seed(0)
Z = np.random.rand(6, 6)

plt.subplot(121)
plt.subplot(131)
plt.imshow(Z, alpha=1.0, interpolation='none')

plt.subplot(132)
plt.imshow(Z, alpha=0.5, interpolation='none')

plt.subplot(122)
plt.subplot(133)
plt.imshow(Z, alpha=0.5, interpolation='nearest')

@cleanup
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1 change: 1 addition & 0 deletions src/_backend_agg_wrapper.cpp
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Expand Up @@ -299,6 +299,7 @@ static PyObject *PyRendererAgg_draw_image(PyRendererAgg *self, PyObject *args, P
x = mpl_round(x);
y = mpl_round(y);

gc.alpha = 1.0;
CALL_CPP("draw_image", (self->x->draw_image(gc, x, y, image)));

Py_RETURN_NONE;
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0