Dec 9, 2019 · Dec 8, 2019
diff --git a/doc/api/next_api_changes/deprecations.rst b/doc/api/next_api_changes/deprecations.rst
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Please pass capstyles ("miter", "round", "bevel") and joinstyles ("butt",
 "round", "projecting") as lowercase.

 Passing raw data to ``register_cmap()``
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Passing raw data via parameters *data* and *lut* to `.register_cmap()` is
 deprecated. Instead, explicitly create a `.LinearSegmentedColormap` and pass
 it via the *cmap* parameter:
 ``register_cmap(cmap=LinearSegmentedColormap(name, data, lut))``.
diff --git a/lib/matplotlib/cm.py b/lib/matplotlib/cm.py
    instance.  The *name* is optional; if absent, the name will
    be the :attr:`~matplotlib.colors.Colormap.name` attribute of the *cmap*.

 In thesecond case, the three arguments are passed to
 Thesecond case is deprecated. Here, the three arguments are passed to
    the :class:`~matplotlib.colors.LinearSegmentedColormap` initializer,
    and the resulting colormap is registered.
    and the resulting colormap is registered. Instead of this implicit
    colormap creation, create a `.LinearSegmentedColormap` and use the first
    case: ``register_cmap(cmap=LinearSegmentedColormap(name, data, lut))``.
    """
    cbook._check_isinstance((str, None), name=name)
    if name is None:
    if isinstance(cmap, colors.Colormap):
        cmap_d[name] = cmap
        return
    if lut is not None or data is not None:
        cbook.warn_deprecated(
            "3.3",
            message="Passing raw data via parameters data and lut to "
                    "register_cmap() is deprecated. Instead use: "
                    "register_cmap("
                    "cmap=LinearSegmentedColormap(name, data, lut))")
    # For the remainder, let exceptions propagate.
    if lut is None:
        lut = mpl.rcParams['image.lut']
Original file line number	Diff line number	Diff line change
Expand Up		@@ -52,3 +52,10 @@ Case-insensitive capstyles and joinstyles
		~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
		Please pass capstyles ("miter", "round", "bevel") and joinstyles ("butt",
		"round", "projecting") as lowercase.

		Passing raw data to ``register_cmap()``
		~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
		Passing raw data via parameters data and lut to `.register_cmap()` is
		deprecated. Instead, explicitly create a `.LinearSegmentedColormap` and pass
		it via the cmap parameter:
		``register_cmap(cmap=LinearSegmentedColormap(name, data, lut))``.
Original file line number	Diff line number	Diff line change
Expand Up		@@ -90,9 +90,11 @@ def register_cmap(name=None, cmap=None, data=None, lut=None):
		instance. The name is optional; if absent, the name will
		be the :attr:`~matplotlib.colors.Colormap.name` attribute of the cmap.

		In thesecond case, the three arguments are passed to
		Thesecond case is deprecated. Here, the three arguments are passed to
		the :class:`~matplotlib.colors.LinearSegmentedColormap` initializer,
		and the resulting colormap is registered.
		and the resulting colormap is registered. Instead of this implicit
		colormap creation, create a `.LinearSegmentedColormap` and use the first
		case: ``register_cmap(cmap=LinearSegmentedColormap(name, data, lut))``.
		"""
		cbook._check_isinstance((str, None), name=name)
		if name is None:
Expand All		@@ -103,6 +105,13 @@ def register_cmap(name=None, cmap=None, data=None, lut=None):
		if isinstance(cmap, colors.Colormap):
		cmap_d[name] = cmap
		return
		if lut is not None or data is not None:
		cbook.warn_deprecated(
		"3.3",
		message="Passing raw data via parameters data and lut to "
		"register_cmap() is deprecated. Instead use: "
		"register_cmap("
		"cmap=LinearSegmentedColormap(name, data, lut))")
		# For the remainder, let exceptions propagate.
		if lut is None:
		lut = mpl.rcParams['image.lut']
Expand Down