To clarify the exchange between Paul and Richard concerning my method of profiling for digital negatives I should explain that I use two systems, not one.
One system is based on a custom all gray ink set with 8 shades of gray mixed from dilutions of PK, LK and LLK. The profile is partioned, and linearized with regular QTR tools. I use this profile for most of my personal work.
I also use another type of profile based on a single gray value system where all curves follow the K, using only the effective UV blockers in the OEM K3 inks, the PK, LK and LLK. I teach this at workshops because it is very simple to explain and for folks to understand, allows adjustemt of contrast over a wide range and can be linearized easily. And most importantly, it works with any Epson printer with OEM inks installed so there is no need to use third party ink sets.
Having done personal work with both systems I find that there are advantages and disadvantages to both, but both are capable of high quality digital negatives. I am sure of this from my own work, and from the work of students who have done workshops with me.
You can look at both systems in the following files on the carbon forum.
Sandy
https://groups.yahoo.com/neo/groups/CarbronTransfer/files/QTR%20Profiles%20for%20Carbon%20Printing/
Message
Re: [QuadtoneRIP] Re: P600 and all black inkset
2016-11-09 by Kerik Kouklis
Sandy, when I hit your link I get this:
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-Kerik
On Wed, Nov 9, 2016 at 8:03 AM, sanking@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote: