Re: Measuring Delta E from two different spectrophotometers
Re: Measuring Delta E from two different spectrophotometers
- Subject: Re: Measuring Delta E from two different spectrophotometers
- From: Richard Brackin <email@hidden>
- Date: Sat, 26 Aug 2006 08:14:19 -0500
On Aug 25, 2006, at 5:26 PM, <email@hidden> wrote:
Richard,
You should not compare data taken from two different instruments,
as you mention in your point 2. Also, Eye-One Share uses a 2
degrees Observer and your other data was computed with the 10
degrees Observer; not to be done also.
That is effectively what the customer is having us do.
ColorGuide Sphere 6830 readings vs. DataColor 600 readings.
Your point 3, about various resolution for different instruments
goes in line with my comment (in my first response) on the sharp
cut-off often seen on (bright) yellow, orange and red colors.
Yes. I definitely took note of that.
I believe the machine offers 20nm spectral resolution.
Look at the spectrum with the Eye-One. If it goes over 100 at some
wavelengths, around 590 nm, you have your answer on fluorescence.
(Note: You can also use the BabelColor software in demo mode for
this measurement ;-) )
We'll take a look at your software.
Could the fluorescence also uncover the use of brighteners?
I wouldn't think they would do that but could brighteners cause such
a difference?
Is your Eye-One a UV-cut model?
The one I'm using is not UV-cut.
We have an eye-one that is a UV-cut model at our other facility to
calibrate/profile our UV presses over there.
Does one or both of your sphere instruments have a specular-included
(SPIN)/specular-excluded(SPEX) option?
They both have SPIN. I'll have to dig around the menus and see if
they have SPEX but I think they're SPIN.
It's a BYK-Gardner ColorGuide Sphere SPIN model CG-6830 (I should
have initially mentioned they were SPIN).
The two devices we have are pretty much identical.
.
Danny
email@hidden
www.BabelColor.com
Thanks for your time and information.
Richard
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