Reply-To: <QuadtoneRIP@yahoogroups.com>
Date: Tuesday, March 4, 2014 5:57 PM
To: <QuadtoneRIP@yahoogroups.com>
Subject: Re: [QuadtoneRIP] UV transmisison characteristics of Epson K3 inks
David,
Correct, I am using a single gray value system. See below. The profile that I use for carbon printing is attached. I used LINEARIZE to adjust input/output but you could do the same thing with GRAY-CURVE =.
In the past I used a two or three gray value system similar to what Ron Reeder teaches, but last year I switched to a single gray value system after discussions with a Chapel Hill based photographer named Mike Rosenberg. I find the single gray value system much easier to understand and adjust with consistency than the multi gray value method. This profile most likely will give more density range than you need for gravure, but it is easy to lower the DR by reducing the Level numbers of the UV blockers. After I introduced this method of profiling with the K3 inks on my carbon forum several people adopted with the comment that they found it much easier to work with than multi-gray value methods.
Sandy
#PRINTER=QuadR3000
#CURVE_NAME= Carbon100 #Based on Carbon Tissue #222, 16 grams of Black Cat Ink with tissue coated to a wet height of 0.9mm.
#Profile when printing a step wedge gives a DR (density range) of approximately log 2.50.
#With Tissue #222 sensitize with a 8% potassium dichromate solution, diluted 1+1 with acetone, approximately 10 ml per 8X10 sheet, applied in two coatings with a roller. 350 ULF units.
GRAPH_CURVE=YES
N_OF_INKS=8
DEFAULT_INK_LIMIT=55
LIMIT_K=25
LIMIT_C=25
LIMIT_M=1
LIMIT_Y=25
LIMIT_LC=1
LIMIT_LM=1
LIMIT_LK=25
LIMIT_LLK=1
GRAY_HIGHLIGHT=4
GRAY_SHADOW=4
GRAY_GAMMA= 1
CURVE_K= "0;0 100;100"
COPY_CURVE_C=K
COPY_CURVE_M=K
COPY_CURVE_Y=K
COPY_CURVE_LC=K
COPY_CURVE_LM=K
COPY_CURVE_LK=K
COPY_CURVE_LLK=K
LINEARIZE= "14.68 16.7 19.53 22.66 26.41 30.65 34.9 39.36 44.29 48.97 54.62 59.42 63.5 68.13 73.27 77.56 81.13 85.78 89.04 93.05 94.62"