QTR-Quadtone RIP

Sandy,

 

OK, thanks. I’m working on it. A couple more questions. What do your negs look like? Are they quite green? Also, with the profile you gave, do you know what the approximate UV density of the 100% value on a stepwedge is?

 

Kerik

 

From: QuadtoneRIP@yahoogroups.com [mailto:QuadtoneRIP@yahoogroups.com] On Behalf Of sanking@...
Sent: Tuesday, March 04, 2014 5:09 PM
To: QuadtoneRIP@yahoogroups.com
Subject: [QuadtoneRIP] RE: UV transmisison characteristics of Epson K3 inks

 

  

Hi Kerik,
The profile should print on the 3800/3880 with QTR almost the same as it prints with the R3000. I use the same profile, with just a minor adjustment, LK = 40 instead of LK = 25 on the 7800 and the resulting DR and linearization is almost identical with both printers. Carbon is very straight line compared to the long toe and shoulder of palladium so you may need to adjust GRAY-GAMMA to less than 1 to optimize.

For platinum printing, assuming you print with almost pure palladium, the DR of this profile, which is about 2.5, should be fairly close to optimum. But if you need to adjust it up or down it is easy to do, just increase the Level of the K, C, Y and LK inks to get more density, decrease the Level for less density. And change the inks more or less proportionally to avoid confusion. Leave the low UV blockers as is, they don't matter anyway in a single gray system. 

As for K boost, I don't use it and I think you will find need it with this profile. After you nail down the DR just use Eisenlord's Build QTR script, print a step wedge and create your correction curve.

If you try this and find a problem please point it out. I am still new to this method and like it so much I may have missed something important.

Sandy





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