QTR-Quadtone RIP

Ron

You don't say which inkset you are using. I have done a partial (warm/cool)
set of curves for Epson UC ink with VFA. This paper can definitely take a
lot more than 65% K ink for the UC matte. My curves have a default limit of
75% and a black boost of 95% and have good shadow separation. The issue I
never resolved was spattering of the black ink in the deep shadows.
Resolving it mean reducing the total K output and probably losing some dmax.
I lost interest when I started using UT7.

I can send you the curves and a curve evaluation spreadsheet if you are
interested. There's also a set of UCmk Velvet Fine Art curves in the files
section of the Yahoo QuadtoneRIP web site.

In addition to the K limit and Black Boost parameters, I have found the
Shadow and Gamma parameters on the Gray Curve panel can affect how your
curve behaves. Another thing you don't mention how you are linearizing the
curve (or even that you are). I assume you are, but the accuracy of your
density measurement device could also be a factor.

Hope this is useful

Tom Moore 

> -----Original Message-----
> From: QuadtoneRIP@yahoogroups.com [mailto:QuadtoneRIP@yahoogroups.com] On
> Behalf Of Ron Faris
> Sent: Saturday, December 02, 2006 7:42 AM
> To: QuadtoneRIP@yahoogroups.com
> Subject: [QuadtoneRIP] blocked blacks
> 
> Hi group:
> 
> I am developing my own curves and ICC profiles for QTR and Epson Velvet
> Fine Art for a
> Epson 2200 printer.  Everything looks great except my 95 and 100 wedges
> are identical.  Can
> anyone please tell me what is the best way to correct this problem.  When
> I printed the
> calibration page, I chose an ink limit of 65% black ...should this be
> lower.  I tried boosting the
> black and altering the shadow value neither of which made much difference.
> 
> thanks
> 
> ron
>