Digital BW, The Print

Phil,

That's a really great idea and one, which would really save me a lot 
o waiting time. I have been scanning my 6x7 negs to get 550MB, 48-bit 
RGB files. I do some adjustments and then drop to 24-bit RGB which 
gives me about a 200-250 MB file and I would like to adjust in RGB 
space as long as possible but even with 1.5GB of RAM and a 1.2 GHz 
CPU this still gets slow. The sample down, work, sample up should get 
me working at a file size where the system will really move.

Is there any limit on how small you go down and do you then have to 
do any tweaking once you are back to the original with the ressed up 
layers?

Thanks,

Martin

P.S. How did the enlargement neg from A&I come out or is the process 
still under development?


--- In DigitalBlackandWhiteThePrint@y..., "Phil Bard" <phil@p...> 
wrote:
> Martin,
> 
> Here's one way to work with large files (+100MB) comfortably.  From 
the 
> raw scan, res down to a small file size, 10 to 20 MB, and save 
> separately. Then add your adjustment layers for curves and levels, 
with 
> masks if needed, etc., as many as you desire, to get the look you 
want.  
> Then create a "layer set" for all of the added layers above the 
> background, and res *back up* (yes, you heard correctly) to the 
exact 
> same pixel size of the original.  Then simply drag the _set_ from 
the 
> layers palette into the original file's window holding down the 
shift 
> key (so it will center up correctly) and all of your adjustment 
layers 
> will now reside in the larger file.  If you don't res back up, none 
of 
> the adjustment layers will scale correctly.  Then you are ready to 
do 
> any cloning or other manipulations necessary.
> 
> Works great...
> 
> Phil
> http://philbard.com
> 
> 
> > The theory is sound but I don't know how much you are really 
getting 
> > in print quality at the end because of the very close similarity 
> > between the three channels to start with. You are also paying a 
> > performance price in working with the bigger files.
> > 
> > My feeling is that for a normal negative requiring moderate 
> > adjustment there might be no gain but for manipulating a 
difficult or 
> > marginal negative perhaps. Really need to try it from scan to 
print 
> > both ways and see if there is a detectable benefit.