Histogram could show statistics for RGB(A) channels separately

[tomasiser]

Hi there, especially now that we are able to crop regions of images and explode RGBA into individual channels with the X key, we can now use the histogram as a color picker that shows the color statistics for rectangular regions.

However, you still need to explode the channels and manually cycle through R, G, and B, while hovering the histogram, to see the mean values of the individual color channels.

Could we make the histogram directly display the RGB(A) numerical statistics without the need to explode the channels every time?

Eventually, it would be nice to have something like the color picker in darktable, which allows selecting multiple crop regions and displaying their color values simultaneously. But that would be a bigger feature. It is extremely useful when you want to objectively compare how colors change either within the same image (e.g., from left to right), or between multiple images.