Is RGB always device-dependent?
Video standards specify abstract R’G’B’ systems that are closely matched to the characteristics of real monitors. Physical devices that produce additive colour involve tolerances and uncertainties, but if you have a monitor that conforms to Rec. 709 within some tolerance, you can consider the monitor to be device-independent. The importance of Rec. 709 as an interchange standard in studio video, broadcast television and high definition television, and the perceptual basis of the standard, assures that its parameters will be used even by devices such as flat-panel displays that do not have the same physics as CRTs.
