Hi to all I'm new in scikit-image, and i develop algorithms for medical applications. Sometimes is very very useful to have user interaction, in particular Region of Interest (ROI) selection over an image. I found in skimage the RectangleTool and i'm trying to write a simple ROI selector in order to use the rectangle coords in successive computations. unfortunately i can't be able to handle mouse events: for example if i've: #import import skimage as sk from skimage import data import matplotlib.pyplot as plt from skimage.viewer.canvastools import RectangleTool import numpy as np from skimage.draw import polygon from skimage.draw import line im = data.lena() f, ax = plt.subplots() plt.imshow(im) def cable(img): # is here usable "extents?" rect_tool = RectangleTool(ax,on_enter=cable(im)) i simply want to see "extents" which is the attribute that store coords for user-selected rectangle according to http://scikit-image.org/docs/dev/api/skimage.viewer.canvastools.html?highlig... i hope this is clear and if it's possible i think is useful to embed this example in docs. thanks in advance