TYPE: COP
TITLE: Premultiply COP

This operation allows color to be converted to or from a premultiplied form.
Premultiplied color is color that has already been multiplied by alpha.

Parameters
    Operation   - The color plane can either be multiplied or divided by the
                  alpha plane.
    Alpha Plane - The name of the alpha plane.
    Scope       - The planes to affect (normally just color).
