setting "Color Settings" to Abs. Color.
setting "Color Settings" to Abs. Color.
- Subject: setting "Color Settings" to Abs. Color.
- From: Tim Vitale <email@hidden>
- Date: Thu, 05 Feb 2004 20:37:12 -0800
I'm trying to pin down the nature of the Lab numbers in the Information
Palette. Using an RGB image, my goal is to compare the "as made" color
values taken from the Information Palette with the the Lab values
measured (using an EyeOne & i1Share) from a printed color target.
This can be done, right?
I read in "Color Management" Frasier, et al, that setting the
"Edit>Color Settings" to Absolute Colorimetric cause the derivative
color information, such as Info>Palette Settigs>Lab, in the Information
Palette to be direct conversions from the RGB values. I assume the
conversion is done through the working space profile (Adobe RGB 1998)
to PCS Lab.
Thus, when working with an RGB image, using the Absolute Colorimetric
w/BPC settings in Edit>Color Settings, the Lab color information in the
Info Palette is a direct conversion of the RGB data in the image, and I
can compare those "as made" Lab values to the Lab values that I measure
directly from the printed image.
Then, if I soft proof the image in View>Proof Setup>Custom, using the
printer profile (whatever the rendering intent), will the Lab values in
the Info Palette reflect the colors being sent to the printer (Epson
9600; Print with Profile, NCM), corrected by the printer profile
(ProfileMaker 4.1.5)? Presumably, the Lab values measured from the
print should be within 2+/- dE of the Info Palette "soft proof" Lab
values? And further, the values measured from the print should also be
within, say, 5+/- dE of the Info Palette "as made" Lab values (assuming
in-gamut colors).
Tim Vitale
Preservation Associates
Emeryville, CA
510-594-8277
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