Histogram can be displayed in one of the following modes:
Histogram scope can be used as a source for creating a mask.
Each type of Histogram can create a given mask type:
RGB or Luma Histogram creates luminosity mask
Hue Histogram creates hue mask
Saturation Histogram creates saturation mask
Using all 3 scopes we can create a HSL qualifier and we can combine it further with a shape mask in the Source Signal scope.
Histogram can be displayed in block mode (no edge smoothing is applied):
Histogram can also be displayed in vertical orientation: