QTR-Quadtone RIP

--- In QuadtoneRIP@yahoogroups.com, "Dr. Cristiano Peverada"
<cpeverada@...> wrote:
>
> I'll try to explain my workflow 
> first there is in the file section of this group some usefull doc
> second linearization is for quad curve 
> icc profile is mainly   for softproofing
> 
> > I have an Eye-One Photo LT.  I used Gretag-Macbeth's 
> > ProfileMaker "MeasureTool" (demo version) to open, and then spot-
> > measure, the QTR-21x4-random file.
> 
> Yes you must use QTR-21x4-random file not the 51 step as in
Eye-One-ReadMe.pdf
>  

> > Once that was done, I saved the resulting .txt file and dragged it 
> > onto the QTR-Linearize-Data.exe program to create a graph with 51 
> > readings.  The L data graph is nice and straight until it gets to 
> > about 60.00, so linearization is needed; this is where I get lost.  
> > The directions for linearizing are detailed in the .pdf as follows:
> > 
> > "The Linearization process is simply creating a correction curve 
> > using the above data to straighten the L data graph. To use this 
> > feature, simply create the ink description file, doing the 
> > partitioning. The GRAY_HIGHLIGHT and GRAY_SHADOW fields can be 
> > approximated at 4 and 8 respectively. Make the quad curve and print 
> > out the Step-21-gray stepwedge, and measure as above. The last line 
> > has the linearization info. Triple-click on it, Copy the whole line 
> > and Paste it to the bottom of the ink description file. Re-process 
> > the ink file with Drop-Quad-Profile."
> > 
> > I'm in the dark from "...simply create the ink description file..."
> > 
> > That is:
> > 1) What is meant by "...simply create the ink description file, doing 
> > the partitioning."?
> > 
> > 2) "The GRAY_HIGHLIGHT and GRAY_SHADOW fields can be approximated at 
> > 4 and 8 respectively..."  --> Which tab in QTR's Curve Creator?
> > 
> > 3) "Make the quad curve and print out the Step-21-gray stepwedge, and 
> > measure as above."  --> Which quad curve?  Do I print out the Step-21-
> > gray stepwedge even though I worked with the larger (51 step) file?
> > 
> > Thanks, appreaciate any input-
> > Jens
> > 
> > PS-- Using Windows XP Pro
> >
> I am on Mac
> the ink description file is the file you must drop on
Drop-Quad-Profile to make a curve 
> that you can use in Qtr like :
> #
> #  quadtone curve descriptor file
> #
> #
> # the printer name
> # the curve name
> #   no spaces or special characters, except - or _  (dash or underscore)
> # Date			15/12/07
> # Printer		Epson 2100
> # INK			epson matte black
> # Paper			epson Archivial Matte Paper
> etc.
> 
> I describe my workflow
> 
> I made a ink description file for my ink, printer, paper starting
from a file for similar paper 
> printer, I  include the correct ink limit and gray partitioning ,
GRAY_HIGHLIGHT=6  
> GRAY_SHADOW=8, without the end line "LINEARIZE=" 
> drop this file on Drop-Quad-Profile
> you must have a new curve file .quad in Curve Drop Box
> print the 21x4 target  with the setting you intend to use for you
work DO NOT use 
> calibration mode in the driver 
> read with the eye-one the target , only Lab value is important
> drop the measure  file on QTR-Linearize-Data 
> you have a file with graph and a end line like this 
> LINEARIZE="96.5325 92.8775 87.96 83.0275 77.3025 71.92 66.0425
61.4925 57.3125 
> 53.465 48.925 45.2425 42.305 39.1225 36.415 33.85 29.2375 27.07
22.2925 20.43 
> 16.685"
> 
> copy this line to the end of the ink description file you have used
before
> drop on Drop-Quad-Profile
> you have done the curve , now for printing use this linearized curve 
> 
> Print again the 21x4 step target with this new curve read it and
drop the measure file on 
> QTR-Create-ICC
> put the icc profile just created  to the correct folder and use it
in PS for softproofing
> 
> Hope this help
>

Thank you Dr. Cristiano Peverada, this is the most useful thing I have
found on the list so far. I am new to QTR and trying to figure out how
to do things like calibrate and linearize, and I find the
documentation pretty opaque. Thank you so much for sharing, I would
not have figure this out on my own and I would love to see this
incorporated into the documentation for the software at some point.