I have an idea for a
grayscale color space that is able to have 11 bits of grayscale depth on a typical 8-bit color depth monitor. The idea I'm going to detail is simple, so I assume it must exist somewhere with some name.
(I should note that I'm interested in this from a game-dev perspective, but this stackexchange seemed to be the most appropriate for this question!)
Consider two grayscale values,
#A1A1A1. We have up to eight values inbetween them, e.g.
#A0A1A0, and so forth. These inbetween values are almost gray. We could even take advantage of the fact that the green channel has higher luminosity than the red channel, and the red channel has higher luminosity than the blue channel. The slight tint shouldn't be noticeable.
So, my question is, is there a name for this idea? Do there exist libraries for photo editing applications that implement this idea?