Re: Photoshop 6/7 problems with OptiCAL Monitor profiles
Re: Photoshop 6/7 problems with OptiCAL Monitor profiles
- Subject: Re: Photoshop 6/7 problems with OptiCAL Monitor profiles
- From: Graeme Gill <email@hidden>
- Date: Thu, 20 Feb 2003 15:50:00 +1100
"Bruce J. Lindbloom" wrote:
>
not the original measurements. If you want to retrieve the original phosphor
>
chromaticities, you must adapt them back from D50 to the original monitor
>
white (found in the media white point tag). In order to do the "back
>
adaptation" correctly, the *same* adaptation algorithm must be used as was
>
used by whomever created the profile (OptiCAL). In ICC v4 profiles, there
>
will be a tag that says what adaptation algorithm was used. In pre-v4
>
profiles (like those Bob probably has), you will have to guess. If you guess
>
wrong, you will not get the correct original measurements.
There's also the chromaticityTag, introduced in ICC.1A:1999-04,
which is explicitly for the device phosphor/colorant chromaticity
information.
Graeme Gill.
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