Is it possible to create a feature that allows the user to select an area within an image in the fitsviewer to give a targeted opportunity to critique background psuedo ADU e.g a moveable box of say 100x100 pixels that shows the user some appropriate stats. The mean/min/max of the 10,000 'background'pixels could be a useful value to quickly determine exposure. The Fitsviewer currently produces DN values for the whole image so why not for a user selected area. Maybe link said feature with the cursor over the image.

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