QTR-Quadtone RIP

Greg,

>
> ... I was under the impression that QTR has the tools to make an ACV curve
> and an ICC profile, using the density data from the 21 step printout and
> the data from the linearised curve.
>

As far as I know, QTR does not make *.acv curves.


In the folder "Program Files > QuadtoneRIP > Eye-One" or the mac
> equivalent, there are 3 program files QTR-Create-ICC, QTR-Create-ICC-RGB,
> and QTR-Linearise-Data. I have yet to work out how to use these tools. The
> first step is to use the ACV curve. How is that created?
>

Not all of these require an acv curve.  For example, if the output of the
Epson driver does not match the monitor with respect to relative densities,
one can simply use a text file with the Lab L readings from a 21-step test
print to "linearize" the output via an ICC.  No acv curve is needed.

I often use the Epson driver, assisted by an ICC made with Create ICC-RGB
to print Eboin-6.  I use acv curves in the ICCs for several reasons.  A
couple of the reasons are, first, if there is quite a difference in density
between the 95% and 100% patch on the 21-step test print when no ICC or
curve is used, then there is insufficient information to allow Create
ICC-RGB to interpolate accurately, and the final curve will not be as
perfect as I like them.  So, I make a general correction curve to get more
information down in the deep shadows so the program doesn't have to "guess"
so much.

A second reason I use acv curves with the 1400 and Eboni-6 is to reduce the
warmth of the highlights.  By using the light Eb6-Y ink (2% Eboni) in the
highlights, about one Lab B unit is cut off the warmth there.


> I was planning to do this to be able to "Soft Proof" the images before
> printing.
>

You would not want to add a curve to an ICC that is used just for that.  If
the output is good, just read the 21-step test print and drop the text file
of the Lab L, A & B readings into Create ICC or Create ICC-RGB.

I hope this helps.

Paul
www.PaulRoark.com

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