QTR-Quadtone RIP

John

I made a cool and a warm curve for UC and VFA. I decided to set the K limit
to 75% and the Black boost to 95%, which is where the density really
flattened out in the inkseparation. The net effect was that the K went to
95% for the deepest shadows. Using Black Boost causes the K to ramp up at
the end of the curve more steeply than it would if I had simply set the K
limit to 95%. That meant that the curve would be closer to the desired form
prior to linearization. In general, I also use the shadow, highlight and
gamma values to bring the curves closer to "ideal" prior to linearization.

I was not happy with the curves and stopped working on them. In the end I
decided that the 95% Black Boost is too high because I was getting ink
spattering near the edges of the blacks. I started using the UT7 inks and
never went back to fix the UC curves.

Tom Moore

> -----Original Message-----
> From: QuadtoneRIP@yahoogroups.com [mailto:QuadtoneRIP@yahoogroups.com] On
> Behalf Of John Hollenberg
> Sent: Saturday, October 22, 2005 12:38 AM
> To: QuadtoneRIP@yahoogroups.com
> Subject: [QuadtoneRIP] Where to Set Ink Limit?
> 
> I am making a profile for Epson Velvet Fine Art on Epson 2200.
> Percent ink, L* values for black ink of the calibration target:
> 
> 0,98.7
> 5,74
> 10,59.3
> 15,48.7
> 20,38.3
> 25,33.2
> 30,29.4
> 35,27.6
> 40,25.3
> 45,23.3
> 50,21.6
> 55,20.5
> 60,19.6
> 65,18.3
> 70,17.7
> 75,17.1
> 80,16.7
> 85,16.3
> 90,15.8
> 95,15.4
> 100,15.4
> 
> Question:  where would you put the ink limit based on these data, and why?
> 
> Thanks.
> 
> --John
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> Yahoo! Groups Links
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