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

Ramesh writes ...

> 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?

  No ... the reason is why you scanned into 16bits.

> 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?

  Again no ... assuming 16bits again.  If 8bit channels, then yes, you'd
want to get all tonal adjustments correct (as possible) with the scan
software.  However, I doubt anyone will notice a minor post-scan adj't with

cheerios ... shAf  :o)
Avalon Peninsula, Newfoundland
www.micro-investigations.com (in progress)

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