Detecting color depth-16 color, 256 color, or 32 bit color

[dano]

I am changing all of my libraries to be agnostic to color depth...or at least trying.  I want them to automatically detect whether we are in 16 color, 256 color, or 32 bit color mode and automatically make adjustments on the fly to compensate for the colors being used, and use the proper colors.

So far so good, EXCEPT that I am having an issue with accurately detecting whether we are in 16 color, 256 color, or 32 bit color.

I cannot find this as a command for QB64.  Is there an easy way to accurately detect this?