Datacolor User to User Support Group.

I was using spyder 3 print to measure the 21x4 random file printed on Ilford gold fibre silk and whenever i read the 0 (paper white) patch it would show up as  light greenish/blue and the values would fall somewhere around
L=97
A=1.4
B=90
I never noticed this before and was wondering if there is a problem with my software or spectrocolormeter.

Would this have anything to do with optical brightners present in a paper? The reason i ask is because i took some measurements of different papers after i noticed this and it was doing the same thing with a canson paper (canson baryta, which is similar to the ilford paper), but not with a hahnemuhle paper that is oba free (as far as i know).   

p.s. after measuring it several times and getting the same results for the 0 patch i went ahead and linearized the curves and the outcome seemed fine.

I have had the same thing occurring on all my papers and was questioning myself why this was so.  I assumed in the end this is because the paper is not pure white (255:255:255)   when I did the split view all the squares are different the pure colour and then the actual printed color allowing for the different papers.  This to me is what the profiling is all about.

On my MAC OSX  I used a utility called Digital Color Meter and measured sample squares to see what was happening and found the white patch pure and then my actual measurement.

If I am wrong let me know  

Elo Laugesen

On Sep 8, 2011, at 7:23 PM, Robert wrote:

> I was using spyder 3 print to measure the 21x4 random file printed on Ilford gold fibre silk and whenever i read the 0 (paper white) patch it would show up as light greenish/blue and the values would fall somewhere around
> L=97
> A=1.4
> B=90
> I never noticed this before and was wondering if there is a problem with my software or spectrocolormeter.

This indicates an excessively whitened paper and/or a dirty white tile. Try cleaning your tile with a lens cloth (a rag may have artificial whiteners from washing) and perhaps a bit of alcohol. 

C. David Tobie
Global Product Technology Manager


Datacolor
5 Princess Road
Lawrenceville, NJ 08648, USA
609.924.2189
www.datacolor.com

Phone: 207.685.9248
Mobile: 207.312.0448
Fax: 207.685.4455
Email:  cdtobie@datacolor.com
Skype: cdtobie