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Deprecate matplotlib.cm.LUTSIZE #20806

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Merged
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Aug 17, 2021
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Deprecate matplotlib.cm.LUTSIZE #20806

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4 changes: 4 additions & 0 deletions doc/api/next_api_changes/deprecations/20806-TH.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,4 @@
``matplotlib.cm.LUTSIZE``
~~~~~~~~~~~~~~~~~~~~~~~~~
is deprecated. Use :rc:`image.lut` instead. This value only affects colormap
quantization levels for default colormaps generated at module import time.
16 changes: 13 additions & 3 deletions lib/matplotlib/cm.py
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Expand Up @@ -16,6 +16,7 @@
"""

from collections.abc import Mapping, MutableMapping
import functools

import numpy as np
from numpy import ma
Expand All @@ -26,7 +27,16 @@
from matplotlib._cm_listed import cmaps as cmaps_listed


LUTSIZE = mpl.rcParams['image.lut']
# module-level deprecations.
@functools.lru_cache(None)
def __getattr__(name):
if name == "LUTSIZE":
_api.warn_deprecated("3.5", name=name,
alternative="rcParams['image.lut']")
return _LUTSIZE


_LUTSIZE = mpl.rcParams['image.lut']


def _gen_cmap_registry():
Expand All @@ -37,11 +47,11 @@ def _gen_cmap_registry():
cmap_d = {**cmaps_listed}
for name, spec in datad.items():
cmap_d[name] = ( # Precache the cmaps at a fixed lutsize..
colors.LinearSegmentedColormap(name, spec, LUTSIZE)
colors.LinearSegmentedColormap(name, spec, _LUTSIZE)
if 'red' in spec else
colors.ListedColormap(spec['listed'], name)
if 'listed' in spec else
colors.LinearSegmentedColormap.from_list(name, spec, LUTSIZE))
colors.LinearSegmentedColormap.from_list(name, spec, _LUTSIZE))
# Generate reversed cmaps.
for cmap in list(cmap_d.values()):
rmap = cmap.reversed()
Expand Down