Add Histogram for Visualization #1005
Description
We have received some nice feedback from several individuals, and one common request is a histogram for visualization of the intensity data. This could be provided beneath the main image viewer. For example, the mesospim software has a nice vertically oriented histogram that allows immediate visualization of sample brightness and adjustment of the lookup table.
It looks like they do this with PyQtGraph, ImageView, which has a histogram widget that can be called with getHistogramWidget... Recreating similar functionality will probably be a bit of a pain in tkinter. https://pyqtgraph.readthedocs.io/en/latest/api_reference/widgets/imageview.html