Rings are barely visible if the beam center is near the image limits

This is because the max radius of the ring is set as the minimal distance between the beam center and the limits of the image.

We could instead set the ring diameter to the height/width of the image:

What do you think @marcus.oscarsson ? Also, is it a problem if rings are visible out of the image ?

Edited Dec 09, 2021 by Loic Huder

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