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Fix alpha array ignored for RGB images in imshow. - #31171
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matthewlos wants to merge 1 commit into
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Array alpha was silently ignored when passing RGB image data to imshow(). For RGBA images, array alpha replaced the existing alpha channel instead of multiplying with it. Now array alpha is used directly for RGB (3-channel) input, and multiplied with the existing alpha channel for RGBA (4-channel) input, consistent with scalar alpha behavior. Closes matplotlib#26092
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This PR has identical code changes as #30795.
As a correction to what is written, this first bug was already fixed a long time ago, so is not something fixed by this PR. |
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Array alpha was silently ignored when passing RGB image data to imshow(). For RGBA images, array alpha replaced the existing alpha channel instead of multiplying with it.
Now array alpha is used directly for RGB (3-channel) input, and multiplied with the existing alpha channel for RGBA (4-channel) input, consistent with scalar alpha behavior.
Closes #26092
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