Re: Chromatic Adaptation in Photoshop
Re: Chromatic Adaptation in Photoshop
- Subject: Re: Chromatic Adaptation in Photoshop
- From: Steve Upton <email@hidden>
- Date: Tue, 27 May 2003 16:26:24 -0700
At 2:52 PM -0400 5/26/03, Roger Breton wrote:
>
> This is what CMM is doing: if the illuminants in source and destination
>
> profiles are different, it does the chromatic adaptation transform.
>
> There is no other way to figure out how XYZ calculated for, say, D65
>
> will look like under D50. I believe Photoshop in this case suppose to
>
> just use the services of whatever CMM it uses, unless it's doing some
>
> extra work on it...
>
>
>
> Boris
>
>
Thank you so much Boris. This helps a lot.
>
>
Do you know how the illuminants are tested: where does the CMM finds this
>
information? The MWP tag of the Source and Destination profile?
I'm not sure what you mean by tested...
As far as I understand it, the chromaticities are adapted to the calibrated white point temperature. There is no way to test (in v2 profiles) if the tags have been adapted or not as far as I know. The v4 profile spec allows (requires) the profile creator to indicate which adaption formula was used. This should help smarter CMMs figure out adaption between profiles in the future...
Regards,
Steve
________________________________________________________________________
o Steve Upton CHROMiX www.chromix.com
o (hueman) 866.CHROMiX
o email@hidden 206.985.6837
o ColorGear ColorThink ColorValet ColorSmarts ProfileCentral
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