Datacolor User to User Support Group.

>>Thanks, that answers most of my questions.  Only have two more:

>>1) I take it that the "coarser grid on the return side" would be used
for softproofing?

Yes...

>>Or does it have some other use?

Well, if you hard convert to the printer profile, and then need to 
reconvert to some other profile, there is no other way to do that than 
to convert through that return side... its not particularly ideal to 
convert to one output profile then another; unless you are proofing one 
device to another. So the biggest reason for the high rez grid in the 
return side would be device proofing, but its useful for softproofing 
as well.

  If so, seems that
the softproof would be less accurate with the coarser grid.

In theory... but going to a screen its not as much of an issue, doesn't 
hurt to have the high rez grid in there though, so we chose to do that 
on our high bit profiles.

>>2) Would the "coarser grid" cause the profile gamut to display
incorrectly in Colorthink, or is that unrelated?

ColorThink must use that return side for its graphing, so yes, it would 
effect ColorThink's (or any other such tool's) gamut graphing. I 
wouldn't expect the difference to be large, however, and any such 
representation must be taken as an approximation.

>>3) How do you get 33 grid points out of 1728 patches?

You don't...

>>Or are most of
the grid points interpolated from the actual measured patches on the
target?

Correct...

C. David Tobie
Product Technology Manager
ColorVision, Inc.
CDTobie@...
www.colorvision.com
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