Re: Lab is always "just right" P2
Re: Lab is always "just right" P2
- Subject: Re: Lab is always "just right" P2
- From: email@hidden
- Date: Wed, 12 Sep 2001 00:49:49 EDT
In a message dated 9/11/01 5:16:07 AM, email@hidden writes:
>
Now if you were talking about 2D graphing, that's a different beast.
>
It is true that Adobe RGB, Ekta, and other spaces contain primaries
>
that lie outside the visible spectrum. In the familiar Yxy
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horseshoe/chromaticity diagram you can see the points of the triangle
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extend outside the spectrum locus (visible light region). This is one
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of those grudgingly-accepted situations where we have the ability to
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make up imaginary colors and the benefit is that we can create a
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triangle (at least a triangle in Yxy) that encompasses the gamut of
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our favorite images. These profiles should still not render colors
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outside of Lab though. IMHO.
Lets take AdobeRGB's pure green: 0, 255, 0. This color is outside Lab's 255
value limitation, and will clip to the same value as 0, 252, 0 when converted
to LAB. Such values outside the ICC Lab space (even though they are inside
the CIE Lab space which does not share the numerical limitation) are bound to
be clipped by ICC color engines.
C. David Tobie
Design Cooperative
email@hidden