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QTR-Quadtone RIP

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Re: Questions to Roy: 3800 UC Curves for Photo Rag 308 (long)

2007-05-03 by Leping Zha

1. I tried to repost to take care of the ill-reformatted charts,
   but obviously did not succeed.  Sorry -- multiple identical
   posts also went into the daily digest.  Anyone really
   interested in these charts please email me for the original
   text file.

2. After several days adjusting, waiting for ink to dry, and
   remeasuring, I realized Roy's curve settings are basically
   what we can get.  By raising the K-ink limits to 55-65, and
   the K-BOOST to 100 I did raise the D-Max a little bit, but
   not too much.  And more than 75 did not work.  Overlapping
   the inks did not help either (within the Eye-One's error
   bars).

3. Also I found the K/LK/LLK ink ratio Roy used make more sense
   than the lower ratios from my measurements.  Using my ratios
   resulted in less linear gray scales (with no linearization).
   Corrections always work the best when there is not too much
   to correct.

Thanks for all who responded publicly and privately,
Leping

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