hi,

> This is "dynamic range" vs. "absolute number of colours". The human
> perception varies a lot accoridng to the environment, and, while the human
> eye has difficulties with a large number of different colours, it is very
> sensible to banding, and different media (film) must support a very large
> dynamic range.
> 
> Digital effects filters also eat a lot of resolution.

ah! You're talking about internal working values - now *this* I can
appreciate - thanks.

alan

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