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[Bug]: interpolation_stage="rgba" does not respect array-alpha #28382

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anntzer opened this issue Jun 12, 2024 · 1 comment · Fixed by #28437
Closed

[Bug]: interpolation_stage="rgba" does not respect array-alpha #28382

anntzer opened this issue Jun 12, 2024 · 1 comment · Fixed by #28437
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topic: color/alpha topic: images
Milestone
v3.10.1

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@anntzer
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anntzer commented Jun 12, 2024

Bug summary

Passing interpolation_stage="rgba" to imshow() results in array-valued alphas being ignored.

Code for reproduction

from pylab import *

im = arange(9).reshape(3, 3)
alpha = linspace(0, 1, 9).reshape(3, 3)

subplot(121).imshow(im, alpha=alpha)  # interpolation_stage="alpha"
subplot(122).imshow(im, alpha=alpha, interpolation_stage="rgba")
show()

Actual outcome

Figure_1

Expected outcome

Same image on left and right (interpolation_stage should not matter at all here.

Additional information

No response

Operating system

macos

Matplotlib Version

3.10.0.dev260+g7275ad95ff

Matplotlib Backend

qtagg

Python version

3.12

Jupyter version

no

Installation

git checkout
@chaoyihu chaoyihu mentioned this issue Jun 22, 2024
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@chaoyihu
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Thanks for raising this issue. The problem is with _ImageBase::_make_image where alpha is written as a scalar when interpolation_stage='rgba'.

I have submitted #28437 which will hopefully resolve this issue.

@jklymak jklymak mentioned this issue Feb 9, 2025
Closed
@tacaswell tacaswell added this to the v3.10.1 milestone Feb 10, 2025
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topic: color/alpha topic: images
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Milestone
v3.10.1
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Respect array alpha with interpolation_stage='rgba' in _Imagebase::_make_image chaoyihu/matplotlib
3 participants
@tacaswell @anntzer @chaoyihu