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Re: Calibration of Digital Negatives
David,
I assume from your reply that a medium gray from a photoshop file (50%,
level 128) should print at exactly 50% dot area . Yes, I know this sounds
silly, but I don't know that much about the printing industry. The reason
that I ask is that the test print which I gave densities for "looks" right.
If I took 30% out of the middle values I fear the print would look quite
anemic.
I intended this to go to the list on Friday, not just to David. (Have to
watch that 'Reply To' feature).
Garet Denise
garet@rmi.net
>Example using your data.
>Ds = 2.28 (100% dot)
>Dp = .06 (0% dot)
>Dt = .74 (your 50% patch)
>
>1-(10^-(.74-.06)) = .791
>divided by
>1-(10^-(2.28-.06)) = .994
>times 100
>= 79.6% dot area
>
>In the graphic arts world, we would refer to this output as
>having 29.6% dot gain.