File:Gamut-Mask-shapes.png

Gamut mask populated with two cut-out shapes. The mask can be rotated by click-dragging in the grey area, each shape can be moved by click-dragging inside it, and the nodes defining the shape can be click-dragged to alter the shape. the slider allows you to set the reference value for the main portion of the wheel, and the buttons allow adding and removal of nodes and shapes respectively.