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Original file line number Diff line number Diff line change 1- *alpha * parameter handling in _ImageBase._make_image
2- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1+ *alpha * parameter handling on images
2+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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4- This PR expands and clarifies code logic in _ImageBase._make_image
5- related to the * alpha * parameter, and ensures that ` ~.Axes.imshow `
6- exhibits the following behavior:
4+ When passing and array to ` imshow(..., alpha=...) `, the parameter was silently ignored
5+ if the image data was a RGB or RBGA image or if ` rcParams['interpolation_state'] `
6+ resolved to "rbga".
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8- 1. When the image does not have alpha channel:
9- - *alpha * not specified: default to 1.0.
10- - scalar *alpha *: broadcast.
11- - array *alpha *: concatenate.
12- 2. When the image has an alpha channel:
13- - *alpha * not specified: nothings needs to be done.
14- - scalar *alpha *: multiply the alpha channel with user-specified scalar.
15- - array *alpha *: replace the alpha channel with user-specified array.
8+ This is now fixed, and the alpha array overwrites any previous transparency information.
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