QTR-Quadtone RIP

Have you tried the Silver Rag cool profile?

The epson black inks are a touch warm and need to be offset with a bit of cyan and magenta.

The changes between the cool and neutral profiles are quite subtle and simply bumping up the cyan limit a step or two in the neutral profile might get you where you want to be without the need for profiling.

It is trivial to copy and edit the text profiles which live in:

/Applications/QuadToneRIP/Profiles/3800-UC

The ink limits for silver rag neutral are:

LIMIT_K=55
BOOST_K=60
LIMIT_C=4
LIMIT_M=5
LIMIT_Y=0
LIMIT_LC=6
LIMIT_LM=7
LIMIT_LK=42
LIMIT_LLK=40

and for silver rag cool:

IMIT_K=50
BOOST_K=55
LIMIT_C=8
LIMIT_M=9
LIMIT_Y=0
LIMIT_LC=8
LIMIT_LM=10
LIMIT_LK=38
LIMIT_LLK=38


If the shadow/midtones are too warm, the critical changes are probably the C (cyan)  and M (magenta) values. I would start by incrementing these limits by one or two points.  

Alternatively, if the highlights are too warm, increment the LC (light cyan) and LM (ligt magenta) values one or two points.

Then reinstall your profile by running the "Install3800.command' script.

Good luck!





--- In QuadtoneRIP@yahoogroups.com, "rmcclaran@..."  wrote:
>
> Hi All,
> I am a brand new QTR user and have a few questions, please forgive me if they have been previously covered, I did do a search.
> 
> First of all, I'm printing B&W on an Epson 3800 using the Ultrachrome inks (I need the flexibility to also print color), using Photoshop CS4, on a Mac.
> 
> I spent most of yesterday making test prints of the same image on Hahnemule Fine Art Baryta (HFAB). I used the Silver Rag curves and also compared to using the Epson Advanced B&W driver (ABW. Overall I was quite pleased with the results, the tones seemed to have more separation (if that's the right term) and overall the prints seemed crisper. However I am still searching for that sweet spot.
> 
> One thing I noticed was using the neutral curve and comparing to ABW, the print made using QTR had an very slight red cast, compared to the very neutral ABW print. I would like the QTR neutral baseline to more closely match the ABW neutral.
> 
> So my question is, in order to achieve these results, do I need to develop my own custom ICC profile for the paper and / or my own custom curves for HFAB paper?
> 
> This may be complicated by the fact that don't own a spectrophotometer that will read reflective, I only have one for profiling monitors. 
> 
> Thanks in advance for any suggestions.
> Cheers,
> Robbie
>