Bob Friesenhahn wrote:
On Mon, 20 Jun 2005, Hal V Engel wrote:
No I am saying that IF the amount and direction of the color shift
caused by metamerism are the same for both the IT8.7 calibration
>> chart and the printer target then metamerism in no longer a
>> significant issue. LED scanners seem
Ahhh, but metamerism still exists! Metamerism due to different ink will
be elminated but there may still be metamerism which causes the scanner
to think that two colors are very similar when they are actually not.
This can be one issue. Another more certain one when profiling CMYK
devices is that there are spectrally different combinations that have
the same same appearance due to the amount of K used. Using a printed
scanner calibration chart can't compensate for this (in fact you have
to choose the level of GCR to print the scanner test chart).
You would have to print several scanner test charts with a range
of GCRs, and then use the appropriate scanner profile for measuring
printer test patches with the matching GCR to hope to compensate for
this effect.
Graeme Gill.
-------------------------------------------------------
SF.Net email is sponsored by: Discover Easy Linux Migration Strategies
from IBM. Find simple to follow Roadmaps, straightforward articles,
informative Webcasts and more! Get everything you need to get up to
speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click
_______________________________________________
Lcms-user mailing list
Lcms-user@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/lcms-user
