Message
Re: New User Guide
2014-11-16 by sanking@...
The linearization process is virtually identical for digital negatives and inkjet prints. For the negative you first make a print with your process, then linearize as you would with a regular print. At the end the lab values need to be inverted to insert into the QTR profile. In fact, the QTR-Linearize-Data-Tool offers choice of normal lab values for prints, or inverted for digital negatives.
The more problematic issue for digital negatives is selection of the inks. In the case of the Epson K3 inkset the only useful UV blockers in a profile for digital negatives are PK, Y and LK. You could also use MK but it tends to give more grain. With digital negatives it is important to be as efficient as possible with the inks since they don't dry as fast on OHP as on paper. Instead of the overlapping curves typical of print profiles, where you have several gray values, I have found that with digital negatives the use of a single gray value where all values follow the K, is simpler and easier to adjust for density range. You can find examples of profiles that I use with carbon transfer with the Epson 7800 and R3000 in the Files section of the Carbon Transfer group on Yahoo.
Sandy