RE: Convert CIE xyY to Photoshop D50/2 CIE Lab
RE: Convert CIE xyY to Photoshop D50/2 CIE Lab
- Subject: RE: Convert CIE xyY to Photoshop D50/2 CIE Lab
- From: "dpascale" <email@hidden>
- Date: Wed, 2 Aug 2017 10:26:51 -0400
Roger,
You need to measure a reference white under the same conditions.
You will get Y (absolute value in cd/m2) for white, which you can use to
normalize data with Y of White Point equal to 100.
Knowing the WP will also enable you to convert from the measurement WP to a
standard WP (D50, etc.)
Danny
www.babelcolor.com
-----Message d'origine-----
De : Colorsync-users
[mailto:colorsync-users-bounces+dpascale=email@hidden] De
la part de Roger Breton
Envoyé : 1 août 2017 18:06
À : 'ColorSync'
Objet : Convert CIE xyY to Photoshop D50/2 CIE Lab
I been measuring flowers with one of my colorimeter.
The petals of one such flower, lit by noon direct sunlight, gave me the
following CIE xyY 1931/2 coordinates:
CIE x = 0.3058
CIE y = 0.2053
CIE Y = 846 cd/m2
I took a picture of the flower and would like to use these coordinates as a
guide for color correction.
My question is how do I convert xyY to Photoshop's Lab?
Not an easy problem, I know, that's why I turn to you guys for any help.
Best / Roger
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