Re: Silly question department, Display Media White Point
Re: Silly question department, Display Media White Point
- Subject: Re: Silly question department, Display Media White Point
- From: Lars Borg <email@hidden>
- Date: Thu, 19 Feb 2015 22:14:43 +0000
- Thread-topic: Silly question department, Display Media White Point
AdobeRGB ICC profile is in error, but too late to change it.
Doug Walker explained it well to me why this is an error.
Lars Borg
-----Original Message-----
From: Graeme Gill <email@hidden>
Reply-To: "email@hidden" <email@hidden>
Date: Thursday, February 19, 2015 11:44 AM
To: ColorSync <email@hidden>
Subject: Re: Silly question department, Display Media White Point
>Roger Breton wrote:
>
>> You see, in both Input and Output profiles, the Tag is encoded with the
>> actual device XYZ colorimetry but not in the case of a Display profile.
>>Was
>> there a time where this wasn't so? I have three recently created monitor
>> profile that all read normalized D50 XYZ under the MediaWhitePoint Tag,
>> 0.96420 1.0000 0.82520.
>
>Hi Roger,
> some ICC V2 profiles will have what you want. Some V2 profiles
>and all V4 profiles will not. For reasons that have not really
>been explained (and in my view, can't be explained in a rational fashion),
>V4 display profiles have been declared to have a D50 media color, even
>thought
>this is rarely the case.
>The actual media color will be implicit in the 'chad' tag,
>although I doubt any standard CMM' do anything with that tag.
>Such profiles effectively have no absolute colorimetric intent support.
>
>Note that on the other hand, ArgyllCMS V2 display profiles are consistent
>with the standard sRGB and AdobeRGB display profiles, having a white
>point tag that represents the actual media color, therefor supporting
>absolute colorimetric intent.
>
>Graeme Gill.
>
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