QTR-Quadtone RIP

Yes, MK has the highest UV blocking of any of the inks in a K3 set. If I had
included it the measurement would have been about log 3.5 at 100%. The
reason I did not include it is because for making digital negatives for
alternative printing most people do not use it in their profiles because its
density is out of line with the other three major UV blockers, Cyan, Yellow
and Light Black. If you notice, at the useful level of about 25% PK, C and Y
are about equal UV blockers, and if we use LK at about 45% - 50% we have
four inks that block about the same. This is good for smoothness in a
digital negative, at least that is what I have found.

In other words, the very high UV blocking is not usually considered a plus
profiling for digital negatives with alternative printing since it is
somewhat overkill for the job.

Then,

Do I assume correctly that you are using the same curve for all four inks,
rather than trying to stairstep them as might be done in a normal B&W
printing ink set?

I am making direct to plate gravure plates on PETG plastic, BTW, so it is
somewhat different. My problem is, I don't know how different?!@

Would you mind sending me a sample QTR profile? DTP requires far less ink
than internegs or it puddles and flows all over the place, but I imagine
proportions would be similar.

I made some fairly nice prints, considering they are a beginner's tests,
today, but I can see my profile is wrong. There is some tone crossover
between upper midtones and highlights.

The big problem with what I am doing is that the inks remain completely wet
on the plate and are simply washed away when the plate is processed. This
makes measurement difficult at best.

David Kachel

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