|
1 | | -*alpha* parameter handlingin _ImageBase._make_image |
2 | | -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 1 | +*alpha* parameter handlingon images |
| 2 | +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
3 | 3 |
|
4 | | -This PR expandsandclarifies code logic in _ImageBase._make_image |
5 | | -related tothe*alpha* parameter, and ensures that `~.Axes.imshow` |
6 | | -exhibits the following behavior: |
| 4 | +When passingandarray to `imshow(..., alpha=...)`, the parameter was silently ignored |
| 5 | +iftheimage data was a RGB or RBGA image or if `rcParams['interpolation_state']` |
| 6 | +resolved to "rbga". |
7 | 7 |
|
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. |