[argyllcms] Re: Linearization
- From: Roger <graxx@xxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Fri, 26 Jun 2009 11:45:48 -0400
Hi Martin,
After careful analysis and comparison, the two methods are not
interchangeable.
On the one hand, TVIs @50% calculated from XYZ SWOP2006 data, gives:
Cyan 17.2%
Magenta 17.2%
Yellow 16.0%
Based on linear dataset for press X, the plate curve adjustments are as
follows.
Plate curves calculated to achieve XYZ TVI aim points result in:
50%C -> 54.79%
50%M -> 48.44%
50%Y -> 48.50%
Plate curves calculated for SWOP2006 Lab aim points on individual CMY scales
result in:
50%C -> 56.9%
50%M -> 49.2%
50%Y -> 42.7%
Big difference in yellow.
So aiming for specific dot gain values is not equivalent to aiming for
specific Lab value.
Best / Roger
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