[Alt-photo] Re: DAS from China

Sandy King sanking at clemson.edu
Sat Jun 1 19:23:48 UTC 2013


On Jun 1, 2013, at 2:16 PM, Kees Brandenburg wrote:
> 
> 
> Getting a straight line curve is something like finding the holy grail!
> 
> 
> -k
> 
> _______________________________________________
> Alt-photo-process-list | lists.altphotolist.org/mailman/listinfo

Yes, that seems to be the case. All of my digital negatives produced with the Epson driver require very abrupt .acv curves to linearize. With QTR I can do much better, in fact some of my profiles require virtually no linearization. 

Then, there is the problem of fine grain. You may have have a perfectly linearized profile, but  if you use the profile for printing with a process like carbon the grain will show. Pt/Pd printers live in a more forgiving world as paper texture often hides printer artifacts!!

For carbon I have a very nice profile for the Epson 3880 that prints very smooth in carbon, and is almost perfectly linear even with no linearizing curve in the profile. I use PK, never managed to get tight grain with MK with any of the Epson printers. 

In general one might be better off with carbon reducing the DR of the negative to 1.8 - 2.0. With the Epson printers that have pizza wheels the higher DR negatives will sometime show the marks with high DR negatives. Not always, but it is always a risk.


Sandy



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