Hank, that would be referring to something like the Radiance line of Video Processors.
Which I use and am totally satisfied with on a RS35. The rs35 doesn't need it as much as the rs25, but it is still a very welcome/useful additional capability. Caution, you might be rather put out by the price of such a tool. Especially if you also start adding in the cost of a decent colorimeter and/or photo spectrometer and additional software to really make the most of it.
IIRC, the RS25 was rather (immensely, actually) inadequate with its built in Color Management System.
Or, alternatively, if you're feeding it via an HTC (Home Theatre Computer) you might find some pure software approach which works well enough for you. Caveat - you'll still need at least a colorimeter to 'do it right'.
Last edited by CrazyEddie; 10-21-2015 at 11:25 PM.