[filmscanners] Repeated "Tonal correction", is it god?

["Nagaraj, Ramesh" <Ramesh.Nagaraj@ca.com>]

Hi,

I have questions about repeated "Tonal correction" on same file. 

case1: Assume that I generate 16bit/Full resolution TIFF file scan from the 
scanner.
I do the "Tonal correction" on it using PS and save the file. I find "Tonal 
Correction" is so correct, so open the file again and do 2nd round of "Tonal 
correction".
Is it bad to do the second round of correction?


case2: My another question is.
If I do the first round of "Tonal correction" at pre-scanning stage using the 
scanner s/w so that scanner output is already  corrected.
Then I do 2nd round of "Tonal correction" using PS. 
Is this also bad?


Is it recommended to some "Tonal correction" at the pre-scanning phase itself?

Thanks in advance
Ramesh




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