Digital BW, The Print

The likelihood that you'd see the results of the combed histogram 
in your prints from such a minor change I think would be unlikely, 
even if you are seeing it in the histogram.

Converting from 8 to 16 bit won't help if you are making a single 
change, but if you are making multiple changes, it can prevent 
some of the round-off errors.

Usually, if I want to make modifications to a pre-existing scan, and 
they are less than trivial, I'll rescan (assuming the negative is still in 
good shape).

Tim
 
> if I open an image file in PS 5.5 or 6.01, which I saved in 8 bit 
> grayscale modus before and proced only a little curve tweaking, 
> for instance elevating the 3/4 tones by 3% and lowering the 1/4 
> tones by 3% in order to get a little more contrast 
> (image/adjust/curves) I always heavily destroy my histogram. 
> That means multiple levels count zero while others count 
> doubled values compared to their neighbours.
> That never happens if I do the same adjustments in a 16 bit 
> greyscale file.
> Switching back from 8 bit to 16 bit doesn´t help.
> Is that normal, or did I miss something.
> Thanks for your advise.


--
Tim Spragens
http://www.borderless-photos.com