1from __future__ import print_function 2 3import pylab as p 4import numpy as np 5import mahotas 6 7f = np.ones((256,256), bool) 8f[200:,240:] = False 9f[128:144,32:48] = False 10# f is basically True with the exception of two islands: one in the lower-right 11# corner, another, middle-left 12 13dmap = mahotas.distance(f) 14p.imshow(dmap) 15p.show() 16