QTR-Quadtone RIP

Thanks for answering,
Joost
I�m still having
some problems with the User�s Guide. I even consulted some papers from
the competition trying to understand (to me) oscure concepts :-).
 
As you hint,
there are some errors in my numbers. This could be of interest to novices like
me, so I post it:
 
The example
uses the EPSON Stylus Photo 2200, TWO gray inks
 
�For Ultrachrome inks, the
measurements above are all that is required. For
QuadTone inks, this process is
repeated for each lighter ink, comparing it to
the next darker ink,
calculating its density relative to that ink and then
converting it to a density
relative to black.�
 
For my R2880 I used K, LK and
LLK inks. 
 
My mistake: I calculated  LK relative to K and LLK relative to LK when I
should have done both LK and LLK relative to K. I got it (hopefully) right when
I read the paper �QuadToneRIP 2.5 Calibration�, with an example w/ 3 inks. Everything is there but I missed it.
 
OK now my curves look much
better.

 
BUT:  in the example (QuadToneRIP 2.5 Calibration) we get:

LK = 32.7% of K 
and 
LLK= 38% of LK 
We make an interpolation and
get LLK=12.4% of K
 
Why don�t we just look at the matching
patches in K and LLK directly (like we do w/ K and LK) instead of doing
first mathematics w/ LK and LLK? Is there a difference?

Regards



      

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