propagate does not expect images with both negative and positive pixels

Bug #1251770 reported by Viva R. Horowitz
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
HoloPy
New
Undecided
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Bug Description

Suppose
img
is an image with both negative and positive pixels.

Then
hp.show(hp.propagate(img,0.01)
gives a distinctly different result than
hp.show(hp.propagate(img - img.min(),0.01)

With autoscaling, the second result looks more similar to the un-propagated image, as desired for a propagation of a small finite distance.

description: updated
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