Obviously, there are no rules dictating what one has to do with regard to prepping a film scan prior to color conversion with NLP, but a question arises: If a scan of a color negative was already generated with gamma 2.2 by the scanning software, would the TIF Scan Prep utility make any observable difference to the color conversion done by Negative Lab Pro?
My understanding is that the TIF Scan Prep utility essentially does the following:
Takes the original TIF file and temporarily converts it to gamma 1.0 (regardless of the file’s original gamma);
Applies color multipliers to the gamma 1.0 color space; and finally
Converts the file to gamma 2.2 (this is the form of the TIF file that is then worked on by NLP).
The intention of the utility seems to be to expand the tonality of the original file before it gets worked on by NLP. In practice, this expansion of tonality should be observable in an expansion of the histogram of the image after the TIF Scan Prep utility has been used. But, if the original scan was already generated with gamma 2.2 by the scanning software, should the “deconversion” to gamma 1.0 followed by “reconversion” back to gamma 2.2 have any practical effect?
Thanks in advance for your feedback.