RE: Microsoft's color-management claims
RE: Microsoft's color-management claims
- Subject: RE: Microsoft's color-management claims
- From: "Stan Kouchnarev" <email@hidden>
- Date: Thu, 22 Sep 2005 10:27:27 -0700
- Thread-topic: Microsoft's color-management claims
Hi,
There are LUT-based profiles which are using XYZ color space, they are just rare, because usually internal device independent space for software which is making profile is CIELAB, so there is no reason to convert to XYZ.
For matrix profiles the picture is opposite Lab cannot be used, because only using 3x3 matrix is not possible to do accurate conversion from RGB to CIELAB.
So the bottom line:
LUT-based profile is usually Lab, but can be XYZ
Matrix based profile is XYZ only.
Thanks,
Stan.
Creo Inc., a Subsidiary of Kodak
-----Original Message-----
From: colorsync-users-bounces+skouchnarev=email@hidden [mailto:colorsync-users-bounces+skouchnarev=email@hidden]On Behalf Of bruce fraser
Sent: Thursday, September 22, 2005 9:40 AM
To: Marco Ugolini; ColorSync Users Mailing List
Subject: Re: Microsoft's color-management claims
At 10:57 PM -0700 9/21/05, Marco Ugolini wrote:
>
>By the way, here comes my turn for "stupid question time": why can't ICC
>profiles work from XYZ values instead of CIELAB, as they do now?
>
Stupid factoid time: All matrix ICC profiles use XYZ as PCS. It's
only LUT-based profiles that use Lab.
--
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