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QTR-Quadtone RIP

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Repost of post 6437 Come on guys, someone should know this about linearization

Repost of post 6437 Come on guys, someone should know this about linearization

2008-04-16 by deanedennis33

This is a copy of my 6437 post that did not receive any responses.  It is very simuliar to 
post 5571 that did receive responses, but none that solved the problem or answered the 
questions.

I'm attempting to optimism B&W printing on Epson 2200 using UT7 inks and
QuadTone RIP. Following instructions (no color management) included with QTR download 
I have printed the QTR-21X4-random Reference file. Paper being used is MOAB entrada
300lb. This was printed via the QuadTone RIP using a 50/50 blend of
UT7-EEnhMatte-cool and UT7-EEnhMatte-warm. This has been scanned using Eye-One
Spectro with the "Measure" tool included with ProfileMaker 5.

Below is the QTR-Linearize-Data

QTR-Linearize-Data version 2.5.1.0
File: /Applications/ProfileMaker Pro 5.0.8/Measurement
Files/test2_51step-out.txt
Step Dens Lab A B
0.00 0.023 97.97 -0.10 1.99 - a| b
L +
5.00 0.091 92.14 0.31 1.83 - |a b
L +
10.00 0.166 86.11 0.65 1.72 - | a b L
+
15.00 0.245 80.10 0.96 1.40 - | a b L
+
20.00 0.325 74.40 1.20 1.33 - | ab L
+
25.00 0.397 69.51 1.33 1.06 - | ba L
+
30.00 0.487 63.85 1.55 0.61 - | b a L
+
35.00 0.556 59.69 1.56 0.61 - | b La
+
40.00 0.619 56.16 1.58 0.20 - b L a
+
45.00 0.685 52.54 1.64 -0.12 - b|L a
+
50.00 0.747 49.39 1.60 -0.39 - bL| a
+
55.00 0.818 45.91 1.56 -0.98 - bL | a
+
60.00 0.876 43.24 1.47 -1.34 - bL | a
+
65.00 0.940 40.38 1.35 -1.67 - bL | a
+
70.00 1.025 36.83 1.25 -1.79 - b | a
+
75.00 1.086 34.40 1.10 -1.98 - L b | a
+
80.00 1.177 31.02 1.03 -1.72 - L b | a
+
85.00 1.244 28.65 0.99 -1.43 - L b | a
+
90.00 1.381 24.20 1.02 0.21 - L b a
+
95.00 1.480 21.26 1.13 1.55 - L | a b
+
100.00 1.543 19.49 0.40 0.98 - L |a b
+

LINEARIZE="97.97 92.1375 86.11 80.0975 74.395 69.5075 63.8475 59.6925 56.155
52.5425 49.3875 45.915 43.24 40.375 36.83 34.4 31.0175 28.6525 24.1975 21.2575
19.4875"

So far, so good. However this is where I get lost in the instructions provided
with QTR.
The next step is to "Linearize a QuadTone RIP Curve." Instructions say: "To use
this feature, simply create the ink description file, doing the partition." 
QUESTION: Do I make this "ink description" file from scratch; do I use one from the 
"Exampleinks" file; if I use one from the Exampleinks file, which one do I use; or, is there 
another ink description file located elsewhere that I need to use?  and, what is the 
"partition?"

When I get the correct ink description file to work with (hopefully someone will
inform me of this), I know to change GRAY_HIGHLIGHT and GRAY_SHADOW fields to 6 and 
8 respectively, as per instructions.

The next step has me making a quad curve from this new ink description file via,
I believe, by using the Drop-Quad-Profile.

I should next print the Step-21-gray stepwedge using this new quad curve and
measureas before.

The new Quad Ink Descriptor File will have the Linearization information that I
am to "copy and paste to be bottom of the ink description file." ANOTHER QUESTION: 
which ink description file do I paste this into? and does this actually go, as the
instructions list, just at the bottom of the file under "UC_NEUTRALIZER=NO."

Once I have the correct ink description file modified with the new Linearization
information I am to reprocess the ink description file with Drop-Quad-Profile
and hopefully arrive at a perfect profile to print with.

Unless I'm missing something here completely, I am at a loss to see where any of
the information obtained in the first QTR-21X4-random Reference file and resulting
measurement is used in the development of the final profile.

Any help appreciated.

DD

Move to quarantaine

This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.