Re: CV's Optical,PreCal, and Spyder for CRT/LCD
Re: CV's Optical,PreCal, and Spyder for CRT/LCD
- Subject: Re: CV's Optical,PreCal, and Spyder for CRT/LCD
- From: Roger Breton <email@hidden>
- Date: Thu, 23 Jan 2003 08:26:02 -0500
>
> Did you test in OptiCal's colorimeter window whether the readings you
>
> take with your Spyder match the Lab values reported by Photoshop when
>
> you display corresponding RGB values with your monitor profile as the
>
> source? That could give you an indication.
>
>
I've never noticed the colorimeter window before (thanks) and the readings are
>
RGB and CIE values but I don't see Lab.
>
>
Russell
What are the readings reported in then? CIE xyY, CIE XYZ? Maybe someone else
on the list, more knowlegeable than me, could guide us through converting
from CIE xyY to CIE Lab D50 in the case of a monitor. I see a number of
issues here. Is OptiCal's reported CIE xyY truly "D50" (I would assume so)?
If it is, then converting back to XYZ from xyY should be a straightforward
matter and from there it shouldn't be too difficult either to convert from
XYZ to CIE Lab, provided we know which reference white to use.
What does the ICC says to use for that? Are we use that of D50 or the
monitor white point relative XYZ (Y=1.00)?
Roger Breton
Laval, Canada
email@hidden
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