Datacolor User to User Support Group.

This is some of the results I got with a search on the group emails.

 

Post 4710

"This should be a real simple question and my appologies if it has been

answered in the past (I did a search, but didn't find it)...

>

> What would be considered an acceptable range of readings for measuring the

white calibration tile.

>

> I measured mine and got L=90.40, a= -0.98 b= -1.09 (Density 0.11).

>

> Then I cleaned the tile using a paper towel and Sparkle Glass Cleaner
(like

windex but is pink rather than blue).

>

> I measured the tile again and the "b" value seemed to have changed quite a

bit. The new values are L= 90.67, a= -1.04 b= -1.59 (Density = 0.11)

>

> Are these values within acceptable range and did it get better or worse
after

cleaning?

 

Your sense of "quite a bit" might be out of calibration. Half a point is not

really very significant. You might have actually cleaned some dirt or dust
off

your tile... or you might have used a paper towel with artificial whiteners
in

it, which were deposited on the tile causing it to read "bluer"... if re
cleaning

it with a lens cloth instead of a cloth or paper product which may contain

whiteners does not return it to the original value, then we'll assume it was

dirty.

 

Either reading is within the acceptable range for a white tile."

 

C. David Tobie

Global Product Technology Manager

Digital Imaging & Home Theatre

CDTobie@..."

 

 

"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.

 

Post 4962

"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. D. Tobie

Global Product Technology Mngr.

Imaging Color Management

Datacolor.com

CDTobie@..."

 

"Your white tile readings are in range. Sounds like your paper has tons of
whiteners. Cleaning your tile may help, but I try to avoid media with that
degree of whiteners. 

C. D. Tobie

Global Product Technology Mngr.

Imaging Color Management

Datacolor.com

CDTobie@..."

 

On Aug 1, 2011, at 3:22 PM, "Chuck" <warnerphoto@...> wrote:

 

> I have the older Model 1005 Spyder Print and it's readings after
calibration appear to be off. After calibration, I measure the tile at
L90.39   A0.86   B1.26, and a subsequent reading of clean unprinted Lexjet E
satin paper as L99.09   A0.71   B10.7 which is a light cyan.  Any
suggestions?"

 

 

Post 251

This one is very early on and is for the first DC1005, but I presume this is
the same for the strip reader model also!

This would pre-empt a replacement tile, as they need to be recalibrated in
the factory.

(Black tiles are no longer used in the strip reading model)

 

"What was the purpose of having a black calibration?  I read somewhere

earlier that for some spectrophotometers the tile was "married" to the

spectro in the factory.  I'm assuming this isn't the case here.

 

 

Actually it is. There are master black and white tiles at the factory, and
there are device tiles that ship with the unit, which are serialized to
match each unit. So don't go having Spectro slumber parties, and ending up
with someone else's base... <G> Not that there is going to be much variation
between different white tiles, but you might as well have the one your unit
was calibrated to.

 

Black calibration is not a factor for the DC 1005. If you run the black
calibration function in the software (not used in the wizard workflow) it
does nothing but run a check. The black calibration call, and the black
tile, will both disappear from future versions of the software/hardware. It
doesn't effect accuracy, and we're trying to simplify things as much as
possible...

 

C. David Tobie

Product Technology Manager

ColorVision Business Unit

Datacolor Inc.

CDTobie@...

www.colorvision.com"

 

Paul From Christchurch NZ

 

From: datacolor_group@yahoogroups.com
[mailto:datacolor_group@yahoogroups.com] On Behalf Of
chriscalvert@...
Sent: Monday, June 24, 2013 7:36 AM
To: datacolor_group@yahoogroups.com
Subject: Re: [datacolor_group] Using SpyderPrint v4.2.3 to take an
individual spot measurement

 






Well that was simple. Thank you.

 

Out of curiousity what reading should I get from the white tile used for
calibration. ?

I find that I get a better reading (looks whiter as well) from a sheet of
white paper.

I am wondering if that is why I seem to be having some difficulty in getting
a successful scan of the test sheets. My white tile looks very faintly
"dirty". Cleaning with iso-Propyl doesn't help. I think that the white
calibration is most crucial for accuracy.

 

Is it possible to order a spare tile (p/n 1200-1674 or it might be
1200-1574) ?_,___