Element: entity.brightness
Element: entity.brightnessnumeric
The color brightness of the graphic primitive. Brightness adjustment enables the red, green and blue components of a graphic item's colors to be uniformly increased, similar to a brightness dial on a TV. A brightness value can have a range -1 through 1: -1 for black, 0 for no change, 1 for white.
The value of this element can be redefined.
The brightness of new primitives is 0 by default, unless defined otherwise via the -br switch on the entity creation command.