> What if your vision was blanked for a time (eg. half-second or second) 
> between each successive frame?  How many grey shades could you 
> distinguish reliably?

That wouldn't be a fair test. It's hard for humans to find differences 
between two images (even big differences) if the image blanks for a 
second before showing the other. I saw an example that swapped two 
images with a black screen in between, then did it again without the 
black screen and *then% I could notice the differences.

Anyway, I don't care about an accurate test of eye sensitivity. I just 
know that I can notice "color bands" on grayscale images, and more bits 
per channel would avoid that.

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