ImageStack should support dictionaries for cmap

[jlstevens]

This currently works with a list:

import numpy as np
x = np.arange(0, 3)
y = np.arange(5, 8)
a = np.array([[np.nan, np.nan, 1], [np.nan] * 3, [np.nan] * 3])
b = np.array([[np.nan] * 3, [1, 1, np.nan], [np.nan] * 3])
c = np.array([[np.nan] * 3, [np.nan] * 3, [1, 1, 1]])

img_stack = hv.ImageStack((x, y, a, b, c), kdims=["x", "y"], vdims=["a", "b", "c"])
img_stack.opts(cmap=["red", "green", "blue"])

But using a dictionary (which is often more convenient when you don't know the layer order, or need to map a category to a colour) does not work:

import numpy as np
x = np.arange(0, 3)
y = np.arange(5, 8)
a = np.array([[np.nan, np.nan, 1], [np.nan] * 3, [np.nan] * 3])
b = np.array([[np.nan] * 3, [1, 1, np.nan], [np.nan] * 3])
c = np.array([[np.nan] * 3, [np.nan] * 3, [1, 1, 1]])

img_stack = hv.ImageStack((x, y, a, b, c), kdims=["x", "y"], vdims=["a", "b", "c"])
img_stack.opts(cmap={'a':"red", 'b':"green", 'c':"blue"})

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.