LinearSegmentedColormap.set_alpha¶
-
LinearSegmentedColormap.
set_alpha
(alpha, coords=None, ratios=None)[source]¶ Set the opacity for the entire colormap or set up an opacity gradation.
- Parameters
alpha (float or list of float) – If float, this is the opacity for the entire colormap. If list of float, the colormap traverses these opacity values.
coords (list of float, optional) – Colormap coordinates for the opacity values. The first and last coordinates must be
0
and1
. Ifalpha
is not scalar, the default coordinates arenp.linspace(0, 1, len(alpha))
.ratios (list of float, optional) – Relative extent of each opacity transition segment. Length should equal
len(alpha) + 1
. For examplecmap.set_alpha((1, 1, 0), ratios=(2, 1))
creates a transtion from 100 percent to 0 percent opacity in the right third of the colormap.