Bug summary

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

Code for reproduction

frompylabimport*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

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