morphology.skel modifies input image

[stefanv]

Description:

Run skel on a boolean mask. The mask is modified.

Way to reproduce:

No response

Version information:

No response

[lagru]

I'm probably missing something but could you clarify? I can't reproduce with

import numpy as np
import skimage as ski

mask = np.ones((10, 10), dtype=bool)
mask_ref = mask.copy()

ski.morphology.skeletonize(mask)
np.testing.assert_array_equal(mask, mask_ref)