Re: EyeOne Accuracy for FOGRA Proof Verification
Re: EyeOne Accuracy for FOGRA Proof Verification
- Subject: Re: EyeOne Accuracy for FOGRA Proof Verification
- From: Marco Ugolini <email@hidden>
- Date: Sun, 10 Jun 2007 11:05:49 -0700
- Thread-topic: EyeOne Accuracy for FOGRA Proof Verification
In a message dated 6/10/07 5:52 AM, Roger Breton wrote:
>> Short term repeatability
>
> 0.1E* 94 (d50, 2°), mean value of 10 measurements
> every 3 seconds on white
It's also true (and I think not repeated often enough) that if you make
repeated measurements *without moving the EyeOne spectrophotometer*, the
measurements are usually very close to one another, probably within the
specs declared by the manufacturer.
But as soon as you move the EyeOne, even a smidgen over the *very same*
patch, and take another measurement, the new value may differ significantly
from the previous one. I'm not sure why that is, since it's the same patch,
but I suspect that it has something to do with the way the color is laid
down ever so imperfectly and the substrate itself is not perfectly
homogenous, and so on, so that even a slight move changes the color somewhat
perceptibly (by the EyeOne, at least).
So, when checking repeatability, do *not* move the device between
measurements, and see what you get that way.
Marco Ugolini
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