Displays a continuous histogram of the input video.

PARAMETERS

1. Mode 0 = Luma, .25 = RGB, .5 = RGB + Luma, .75 = RGB Overlay
2. Fill if non-zero, use fill, else draw lines
3. Erase Bkgnd if non-zero, erase background, else background is input video
4. Scale vertical scaling: 0 = minimum, 1 = maximum (frame height)
5. Origin 0 = top, 1 = bottom; ignored if Scale is maximum
6. Line Width 0 = one pixel, 1 = maximum; only applies to line draw mode