DOC : move MEP21

Author: tacaswell

doc/devel/MEP/MEP21.rst

@@ -0,0 +1,56 @@
+==============================
+ MEP21: color and cm refactor
+==============================
+.. contents::
+   :local:
+
+
+Status
+======
+
+- **Discussion**: This MEP has not commenced yet, but here are some
+  ongoing ideas which may become a part of this MEP:
+
+
+
+Branches and Pull requests
+==========================
+
+
+
+Abstract
+========
+
+
+ * color
+   * tidy up the namespace
+   * Define a "Color" class
+   * make it easy to convert from one color type to another ```hex -> RGB```, ```RGB -> hex```, ```HSV -> RGB``` etc.
+   * improve the construction of a colormap - the dictionary approach is archaic and overly complex (though incredibly powerful)
+   * make it possible to interpolate between two or more color types
+     in different modes, especially useful for construction of
+     colormaps in HSV space for instance
+ * cm
+   * rename the module to something more descriptive - mappables?
+
+
+Overall, there are a lot of improvements that can be made with
+matplotlib color handling - managing backwards compatibility will be
+difficult as there are some badly named variables/modules which really
+shouldn't exist - but a clear path and message for migration should be
+available, with a large amount of focus on this in the API changes
+documentation.
+
+
+Detailed description
+====================
+
+Implementation
+==============
+
+
+Backward compatibility
+======================
+
+Alternatives
+============

doc/devel/MEP/index.rst

@@ -22,4 +22,5 @@ Matplotlib Enhancement Proposals
    MEP14
    MEP15
    MEP19
+   MEP21
    MEP25