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Mac 32 bit color depth?

I have a simple program that tries to reset the default value of
!P.COLOR for the current (Mac, Win or X) device using the following

device, get_visual_depth=depth
!P.Color = 256L^(depth/8) - 1

I am told that this fails on IDL V5.4 on a Mac since
device,/get_visual_depth returns a value of 32 (whereas !P.COLOR is
256L^24 -1).   Can other Mac users verify this?      What is the meaning
of a 32 bit  visual depth?

Thanks,  --Wayne