Changes options of a Histogram view of a COP image viewer.
imgviewhist [options] view_name [viewport_index]
If viewport_index is specified, only that viewport is affected (1-16). If it is not specified, all viewports are affected.
Image viewer names are always of the pattern imgviewN where N = 1,2,3... (e.g. imgview1).
Enable or disable the view.
Turns on/off the labels.
Turns on/off the guides.
Turns on/off the handles.
Turns on/off the previews.
Turn on/off transparency.
Turn on/off background images.
Display color channel (0 = red, 1 = green, 2 = blue, 3 = alpha, -1 = all)
Sets the histogram type: