Datacolor User to User Support Group.

Tom, I don't have an answer to your question, but I'm curious if you're
making multiple readings and averaging?  The possibility of a little ambient
light or other error during a single reading might change your results.

It does seem that the 4-5 delta-e measurements are pretty surprising, as
well as the wide variation from patch to patch.

I don't have the colorchecker, so no way to duplicate your work here, sorry.

You might try posting this on the colorsync forum too (or maybe you already
have).

-kris 

> -----Original Message-----
> From: colorvision_group@yahoogroups.com 
> [mailto:colorvision_group@yahoogroups.com] On Behalf Of Tom
> Sent: Thursday, March 02, 2006 8:26 AM
> To: colorvision_group@yahoogroups.com
> Subject: [colorvision_group] GretagMacbeth Mini ColorChecker 
> - Delta-E?
> 
> I asked this question elsewhere and am hoping someone here on 
> this list can give me more insight on this set of measurements.
> 
> Does anyone know what the mean and standard deviation are for 
> the Delta-E and Delta-E (a*b*) are for a typical mini 
> ColorChecker chart from GretagMacbeth?
> 
> I'm getting the following when reading with the 
> SpectroColorimeter from my PrintFIX PRO package:
> 
> Patch Delta-E
> 
> 1 1.0
> 2 2.0
> 3 2.1
> 4 3.5
> 5 2.9
> 6 2.4
> 7 3.2
> 8 2.0
> 9 2.4
> 10 3.8
> 11 2.7
> 12 5.6
> 13 3.7
> 14 1.9
> 15 3.9
> 16 3.5
> 17 2.7
> 18 3.3
> 19 3.1
> 20 2.3
> 21 4.0
> 22 1.6
> 23 1.8
> 24 0.4
> 
> 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?
> 
> Thanks in advance.