Datacolor User to User Support Group.

On Jan 21, 2008, at 4:37 PM, boborlehanneton wrote:

> that's all that I can do for the moment because I'm not at home until
> friday. You can see what is the problem with cyan with the measures.
> This must confirm your opinion about a device issue.
>
> The measure of the paper after calibration on the base is Lab:
> (99.31,-0.28,-100.26)
>
> I will clean the spectro this WE but I cleaned it before the
> calibration (without alcohol).
>
> I tried the ref black (automatic) but contrast is still bad in soft
> proof. It is perhaps linked to the spectro issue but the prints are  
> good.
>
>

If your paper white measures with -that- Lab value, then it's
measuring (incorrectly) as CYAN, and the measured patch will look
a colored cyan, it won't look anything like white at all.

It should be perfectly obvious that what your measured value
isn't coming in as paper white.

Conclusion:

a) Your spectro is bad, and needs replacement.

b) You will never be able to build a good profile from the
measurements. (So I don't understand "the prints are good" part of this)



David Miller
Senior Software Developer, Digital Color Solutions
Datacolor