This figure illustrates the gray-scale erosion by a flat disk.
.
from morph import *
f=mmreadgray('n2538.tif')
D=mmsedisk(3)
g=mmero(f,D)
fs=mmsurf(f)
gs=mmsurf(g)
mmshow(f)
mmshow(g)
mmshow(fs)
mmshow(gs)
