diff --git a/lib/matplotlib/colors.py b/lib/matplotlib/colors.py
index 32f675b6d8c5..17777a63642a 100644
--- a/lib/matplotlib/colors.py
+++ b/lib/matplotlib/colors.py
@@ -1262,16 +1262,27 @@ def _make_norm_from_scale(scale_cls, base_norm_cls=None, *, init=None):
After ::
@_make_norm_from_scale(scale_cls)
- class base_norm_cls(Normalize):
+ class norm_cls(Normalize):
...
- *base_norm_cls* is filled with methods so that normalization computations
- are forwarded to *scale_cls* (i.e., *scale_cls* is the scale that would be
- used for the colorbar of a mappable normalized with *base_norm_cls*).
-
- The constructor signature of *base_norm_cls* is derived from the
- constructor signature of *scale_cls*, but can be overridden using *init*
- (a callable which is *only* used for its signature).
+ *norm_cls* is filled with methods so that normalization computations are
+ forwarded to *scale_cls* (i.e., *scale_cls* is the scale that would be used
+ for the colorbar of a mappable normalized with *norm_cls*).
+
+ If *init* is not passed, then the constructor signature of *norm_cls*
+ will be ``norm_cls(vmin=None, vmax=None, clip=False)``; these three
+ parameters will be forwarded to the base class (``Normalize.__init__``),
+ and a *scale_cls* object will be initialized with no arguments (other than
+ a dummy axis).
+
+ If the *scale_cls* constructor takes additional parameters, then *init*
+ should be passed to `_make_norm_from_scale`. It is a callable which is
+ *only* used for its signature. First, this signature will become the
+ signature of *norm_cls*. Second, the *norm_cls* constructor will bind the
+ parameters passed to it using this signature, extract the bound *vmin*,
+ *vmax*, and *clip* values, pass those to ``Normalize.__init__``, and
+ forward the remaining bound values (including any defaults defined by the
+ signature) to the *scale_cls* constructor.
"""
if base_norm_cls is None:
@@ -1279,12 +1290,12 @@ class base_norm_cls(Normalize):
if init is None:
def init(vmin=None, vmax=None, clip=False): pass
- init_signature = inspect.signature(init)
+ bound_init_signature = inspect.signature(init)
class Norm(base_norm_cls):
def __init__(self, *args, **kwargs):
- ba = init_signature.bind(*args, **kwargs)
+ ba = bound_init_signature.bind(*args, **kwargs)
ba.apply_defaults()
super().__init__(
**{k: ba.arguments.pop(k) for k in ["vmin", "vmax", "clip"]})
@@ -1329,6 +1340,9 @@ def inverse(self, value):
Norm.__name__ = base_norm_cls.__name__
Norm.__qualname__ = base_norm_cls.__qualname__
Norm.__module__ = base_norm_cls.__module__
+ Norm.__init__.__signature__ = bound_init_signature.replace(parameters=[
+ inspect.Parameter("self", inspect.Parameter.POSITIONAL_OR_KEYWORD),
+ *bound_init_signature.parameters.values()])
return Norm
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