Datacolor User to User Support Group.

In a message dated 3/2/06 8:31:43 AM, ttrostel@... writes:


> Some of them look pretty far off but others are spot on. Is this
> standard deviation from manufacturing of the color checker chart or
> are the pigments used to create the chart somewhat different than what
> the Datacolor 1005 can interpret?
> 

To make this interpretation, you would have to set up some other (laboratory 
grade) device as a standard, and judge the DC 1005 compared to that. Which is 
exactly what is done in testing the 1005 in the first place. The BCRA ceramic 
tile set that Datacolor (and Gretag) use to test their instruments are not 
that different than the ColorChecker in formulation, so there is no reason to 
expect that that accuracy measuring these patches should be much worse than the 
inter-instrument agreement value in the 1005 spec. Given that they are fairly 
similar color sets, I would expect the quoted .4 average and 1.0 max to be 
about right. So there is plenty of slop left over to blame on other things...   
For instance the ColorChecker has been reformulated. so there are batch to batch 
issues. Where did you get your CC reference file? Can you send me your 
reference file, so I can compare it to what I see from various spectros on the Color 
Checker?

thanks,
C. David Tobie
Product Technology Manager
ColorVision Business Unit
Datacolor Inc.
CDTobie@...
www.colorvision.com