Re: LAB Values attained from Profiles
Re: LAB Values attained from Profiles
- Subject: Re: LAB Values attained from Profiles
- From: Marco Ugolini <email@hidden>
- Date: Thu, 12 Feb 2009 23:22:12 -0800
- Thread-topic: LAB Values attained from Profiles
In a message dated 2/12/09 3:00 PM, Mike Stewart wrote:
> Can anyone tell me the proper way via Photoshop to read LAB values of
> colour swatches usinf ICC profiles. Ex: If I wanted to know what the LAB
> values of a colour bar are supposed to be by using the US Sheetfed
> Uncoated ICC Profile; what's the proper way in Photoshop to get the actual
> LAB values readings.
There is no need to change Photoshop's color settings (which carries the
risk that you may forget to change them back, and produce strange results in
the rest of your work as a consequence).
Instead, leave your color settings alone. Just open the CMYK file containing
the swatches for the solids, overprints and tints. Assign your chosen
profile -- US Web Coated (SWOP) v2, for example.
IMPORTANT: Do *not* convert! Just *assign*!
Then select Edit > Convert to Profile, choose "Lab Color" as your
destination profile, and select the Absolute Colorimetric rendering intent
from the "Intent" pulldown menu. Click "OK".
The resulting values will account for the effects of the substrate on the
colors, thanks to the use of the Absolute Colorimetric intent.
Marco Ugolini
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