[Cin] Histogram Plugin add on feature

[Phyllis Smith]

A demo to go with an explanation.
    https://streamable.com/h0rzo5
The histogram plugin ordinarily applies a value for a single frame.  This
new feature modifies histogram to show values for a selection of frames.
You use several frames in a video that you want to use the *"average"*
color to determine the color you want the rest of the video to be.  When
there is a large light or color variation within a range of a few frames,
you spend a lot of time correcting each frame when it would be better to
just get an average value to use.  If you want, then you can make a LUT for
that set of frames instead of each frame.

Thanks, great addition. But I must understand how it works.
>

I hope this helps, but I need a better understanding myself.  Phyllis
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