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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[MNT]: Colormap refactoring","articleBody":"### Summary\n\nThis is a collection of topics on colormaps to improve the API and also to eventually make colormaps immutable.\n\n### Tasks\n\n- [x] Deprecate parameter `ListedColormap(..., N=...)`\n     It's beyond the scope of `ListedColormap` to post-process the given list of colors.  \n     PR: #29135\n- [x] Narrow the type of the colors parameter to `ListedColormap` to a sequence, i.e. no single colors https://github.com/matplotlib/matplotlib/issues/28763#issuecomment-2319169328\n     PR: Implicitly via #29135, because a single color has only worked when also passing `N`.\n- [x] Fix `ListedColormap.monochrome` attribute #28763  \n  PR: #29125\n- [x] Add add `over`, `under`, `bad` kwargs to constructor, so that one doesn't have to write `ListedColormap(...).with_extremes(...)`  \n      PR: #29460\n- [ ] Deprecate `set_over()`, `set_under()`, `set_bad()`\n  PR: #30531 \n- [x] Change default name of `ListedColormap` \"from_list\" to \"\"\n  PR: #30532 \n- [ ] Separate the APIs for mapping [0, 1] -\u003e color (currently `__call__(float)`) from lut-element access (currently `__call__(int)`), because `cmap(1)` and `cmap(1.0)` giving different results is surprising #28198\n  *Suggestion*: Replace `BoundaryNorm` https://github.com/matplotlib/matplotlib/issues/21911#issuecomment-3276419772, which will remove the need for indexing through `__call__`. Maybe create another way to index into a colormap's lut, in case some users need that functionality.\n- [ ] Decide whether we can better handle lookup tables resolution for `LinearSegmentedColormap`\n     and possibly deprecated `rcParams['image.lut']` - globally tuning that parameter seems unreasonable\n     and error-prone\n\n\n\n\n","author":{"url":"https://github.com/timhoffm","@type":"Person","name":"timhoffm"},"datePublished":"2024-11-14T14:53:03.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/29141/matplotlib/issues/29141"}