Datacolor User to User Support Group.

Can someone tell me why, when measuring a target that's printed on a 
white paper stock, the white and near-white squares on the target are 
rendered blue after the Spectro has read it?
This seems to occur when the target is printed on a gloss or semi gloss 
paper. Any guesses?

Jack

In a message dated 2/14/08 4:05:26 PM, jackyonn@... writes:


> Can someone tell me why, when measuring a target that's printed on a
> white paper stock, the white and near-white squares on the target are
> rendered blue after the Spectro has read it?
> This seems to occur when the target is printed on a gloss or semi gloss
> paper. Any guesses?
> 

Check the   list archives for a number of posts on this topic...

C. David Tobie
WW Product Technology Manager
Digital Imaging & Home Theater
Datacolor
CDTobie@...
www.datacolor.com/Spyder3


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--- In colorvision_group@yahoogroups.com, "jackyonn" <jackyonn@...> wrote:
>
> Can someone tell me why, when measuring a target that's printed on a 
> white paper stock, the white and near-white squares on the target are 
> rendered blue after the Spectro has read it?
> This seems to occur when the target is printed on a gloss or semi gloss 
> paper. Any guesses?

Did you calibrate the Spectro first on the white tile before reading targets?

--- In colorvision_group@yahoogroups.com, "John Vitollo" <jvlist@...> 
wrote:
>
> --- In colorvision_group@yahoogroups.com, "jackyonn" <jackyonn@> 
wrote:
> >
> > Can someone tell me why, when measuring a target that's printed 
on a 
> > white paper stock, the white and near-white squares on the target 
are 
> > rendered blue after the Spectro has read it?
> > This seems to occur when the target is printed on a gloss or semi 
gloss 
> > paper. Any guesses?
> 
> Did you calibrate the Spectro first on the white tile before 
reading targets?

Always!!
>

--- In colorvision_group@yahoogroups.com, "jackyonn" <jackyonn@...> wrote:
>
> > Did you calibrate the Spectro first on the white tile before 
> reading targets?
> 
> Always!!

With glossy papers most have brighteners...that's the bluing you could be seeing.