re: Photospectometer values/ real objects
re: Photospectometer values/ real objects
- Subject: re: Photospectometer values/ real objects
- From: Dan Reid <email@hidden>
- Date: Fri, 08 Jun 2001 13:20:50 -0600
On Fri, 08 Jun 2001 08:32:08 -0400, Paul Guba <email@hidden> wrote:
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Now I have spectrostar spectroscan works well for making profiles. Now
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using there software I can measure flat artwork and I am given a set of
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values. These being RGB LAB and CMYK densities as I recall. Am I only
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to trust the LAB values? I ask because lets say I am comparing a
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measured printed value to a photoshop file. Will a difference in RGB
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spaces effect values read? Say perhaps the meter bases its RGB values
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on one space and my file is in another. It must because as I convert
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spaces the values change. Would the not the LAB values also be subject
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to this? If the two were using different lab spaces. I figure there
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must be a standard lab space for measurement for these devices; at least
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I hope. So what would it be and is it the same as Photoshop.
If you measure using D50 2 degree observer than the LAB values can be used
in Photoshop's color picker. No conversion is necessary because that's the
flavor of LAB Photoshop uses. RGB values will change dependant upon the
color space used to create the RGB numbers.
--
Dan B. Reid
RENAISSANCE PHOTOGRAPHIC IMAGING
Color Imaging Solutions Provider
http://www.rpimaging.com | email@hidden
Toll Free: (866) RGB-CMYK [ 866-742-2695 ]
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