RG color models

It was used in several processes during the early innovations of color photography, including Kinemacolor,[4] Prizma, Technicolor I,[5][6][7][8] and Raycol.

In this case, the RG color model can be achieved by disabling the blue light source.

This allows the generation of white, although the color model cannot achieve black, regardless of the primaries chosen.

Outside of a few low-cost high-volume applications, such as packaging and labelling, RG and RGK are no longer in use because devices providing larger gamuts such as CMYK are in widespread use.

In 1858, in France, Joseph D'Almeida [fr] delivered a report to l'Académie des sciences describing how to project three-dimensional magic lantern slide shows using red and green filters to an audience wearing red and green goggles.