Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "gulstenek" <keving@d...> wrote:
> Antonis-
> 
> Thanks for the very detailed answers.  It's very helpful - confirming 
> some things I'd thought and giving me more the think about.
> 
> Having gone through the first paper with a lot of expirementation the 
> following papers, as you suggest, are very straight forward when
> based 
> on the existing profile.
> 
> I don't want to leave the impression that creating the curves is hard 
> - it's not.  It's just that having arrived at a very good result, I 
> am, for some reason, compelled to worry whether I could make it
> better 
> :)
> 


Hi Kevin,

I think Antonis' description is very much the general idea.

The difficulty I think is mainly figuring how much ink the paper can handle.
You've got to decrease a lighter ink as you increase a darker ink.  But if
you come down too fast relative to the new ink coming in you'll get a plateau
or dip in density and linearizing doesn't fix this.  Its hard to compare rates
because a 5% increase from 10 to 15% might not correspond to a 5% decrease
from 75 to 70%.  It would depend how the curve settings map into ink quantities.

With QTR, access to the raw level allows the voodoo math to work :)  I just make
sure the amount of ink is always increasing as well as the balance of light vs
dark ink is always increasing.  Then linearization can straighten it all out.

Roy