Re: [Lcms-user] Detecting if point is in or out of gamut

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

The gamt tag cannot be used because it is broken on many profiles. Lcms does
not uses this tag but its own method (going back and forth in rel.col intent
to see if the color changes). That is the gamut check capability, described
in documentation. 

For a better method, build a gamut solid and check the point for inclusion.
A nice way is Jan Morovic's "segment maxima" which implies spherical
coordinates.

Hope this helps
Marti.


-----Original Message-----
From: lcm...@li...
[mailto:lcm...@li...] On Behalf Of John Weissberg
Sent: Saturday, August 18, 2007 5:30 PM
To: lcm...@li...
Subject: [Lcms-user] Detecting if point is in or out of gamut

We are building printer profiles. We are searching for a method to 
detect whether a given point in is in or out of the printer's gamut.

I understand that many people feel the data in the gamt tag cannot be 
used reliably.

If we have access to the original measurement data used to create the 
ICC profile in the first place, is there a reliable method to 
determining whether a point is in/out of gamut?

Do any of the existing functions/methods in littlecms do this?

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