On Thu, 28 Jun 2001 12:36:12 -0400 (EDT) Raphael Bustin
> Gamma adjustments, by definition, don't
> affect white point or black point --
> only the stuff in between.
> I'm sure even Vuescan has a a way to set
> both of these -- if not, I'd trash it.
It has - the 'image brightness' setting sets both gamma and
brightness/contrast according to some fiendish Hamrickian scheme. I still
preferred them as separate parameters, but that's the control to twiddle
with - in practice it works well - to achieve a scan which does not clip
either end of the histogram. You'll also want to set VS white point to
0.01 and black to 0.0.
Like I said, aim for a rather pallid preview scan which exhibits neither
full blacks nor whites. Use the levels shadow and highlight eyedroppers in
PS to adjust to taste.
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info & comparisons