Re: [Lcms-user] Lab color space for reflective media

[Marti M. <ma...@li...>]

In addition: AFAIK, ICC is now discussing a perceptual reference gamut,
which would be printer-based. So, this would be not the maximum values
but something like a "mean" gamut of printers.

Obviously having that well defined would be a great improvement.
Gamut remapping should never more got across the infinite gamut of
actual PCS, with all the pain this implies.

Regards,
Marti.


----- Original Message ----- 
From: "John Cupitt" <joh...@ng...>
To: <ku...@gm...>
Cc: "Lcms Liste" <lcm...@li...>
Sent: Monday, June 07, 2004 7:19 PM
Subject: Re: [Lcms-user] Lab color space for reflective media


Kai-Uwe Behrmann wrote:
> as far as I understand CIE*Lab is an way to describe colors, which may or
> may not be physically existent.
> My question is which is the colorspacebody of physically ideal
> refrective media? What is the belonging gamut of Lab?
> Is it possible to shrink such an colorspacebody to an special reflective
> media?

Mike Pointer has a database of physically realisable surface reflectances, ie. the LAB values of colours you can actually make and
paint onto surfaces. I've googled, but failed to find a link, sorry :-( but maybe someone here knows a link to his work?

> One way to calculate is to use XYZ as I would think it represents what is
> phylically possible. (The horseshoe derives from it.)

I think that would give you the colours you can make by mixing lights, which is a much larger gamut than surface reflectances.

John


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