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Clarify handling of #rrggbb(aa) colors in matplotlibrc. #22565

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Clarify handling of #rrggbb(aa) colors in matplotlibrc. #22565

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9 changes: 5 additions & 4 deletions lib/matplotlib/rcsetup.py
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Original file line number Diff line number Diff line change
Expand Up @@ -312,10 +312,11 @@ def validate_color(s):
if isinstance(s, str):
if s.lower() == 'none':
return 'none'
if len(s) == 6 or len(s) == 8:
stmp = '#' + s
if is_color_like(stmp):
return stmp
# Support "rrggbb"/"rrggbbaa" without leading '#' as these would be
# interpreted as comments in matplotlibrc. Note that "rgb" -> "#rgb"
# is explicitly not supported, because of the ambiguity e.g. in "C10".
if len(s) in [6, 8] and {*s.lower()} <= {*"0123456789abcdef"}:
return f'#{s}'

if is_color_like(s):
return s
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6 changes: 6 additions & 0 deletions tutorials/colors/colors.py
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,12 @@
+--------------------------------------+--------------------------------------+
| Case-insensitive hex RGB or RGBA | - ``'#0f0f0f'`` |
| string. | - ``'#0f0f0f80'`` |
| | |
| .. note:: | |
| In a matplotlibrc file, and only | |
| there, these strings must be | |
| given without the leading '#', | |
| e.g. as ``text.color: 0f0f0f``. | |
+--------------------------------------+--------------------------------------+
| Case-insensitive RGB or RGBA string | - ``'#abc'`` as ``'#aabbcc'`` |
| equivalent hex shorthand of | - ``'#fb1'`` as ``'#ffbb11'`` |
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