> Given that 8 bits per channel is the most that can be
> displayed by the average monitor, how exactly do
> you propose to demonstrate the problem?
You can always look at the histogram.
And probably you want to do that after converting between color profiles, esp. wide gamut profiles like ROMM (Kodak ProPhotoRGB), esp. when you need such color spaces when you do a lot of transformations.
Of course, the average image can easily be handled fine with 8 bits. And the average digitial camera writing JPEGs also delivers no more than that, but who wants to be average?