QTR-Quadtone RIP

Andrew Maier <andrew@...> wrote:

> **
>
>
> ... questions concerning profiling and curve creation....
>
using a SpyderPRINT spectrometer with success.
>
> ... Mac ... a Epson Photo R265 (known as a R260 in the US)... UT-3D as the
> B&W inkset in this printer,... like neutral toned prints...  My favourite
> paper is Ilford Gold Fibre Silk (for glossy) and Hahnemühle PhotoRag for
> matte paper.
> ...
>
For general information about the inkset, see
http://www.paulroark.com/BW-Info/UT-3D_Readme.pdf.

I have tried to create ICC curves using the QTR create ICC profile script,
>
Use Create ICC-RGB.  It allows you to drop a Photoshop image adjustement
curve into the ICC as well as the linearization data.  See
http://www.paulroark.com/BW-Info/Embedding_Photoshop_Curves_in_ICCs.pdf

... my blacks seem to saturate off at about the 85% mark, ...
>
You can control that with the PS curve you embed in the ICC or with a
profile you make for QTR.  If the 21-step with no curve hit its dmax at
85%, then have a curve that ends at 85% on the black end of the curve.
 Then look at where the inks are and how the R, G and B curves will affect
the C, M and Y inks.  That will give you the control you need.  Start with
the 50% patch and points on the curves at that input level.  When you get
the 50% tone right, go to the 25% and 75% points.  It's a iterative process
(aka trial and error, but you'll probably get the hang of it after a few
moves).

(Because I'm Windows, I'm not going to get into QTR profiling on a Mac, and
the color management issues may be different.)

Paul
www.PaulRoark.com


[Non-text portions of this message have been removed]