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: Roger Breton <email@hidden>
- Date: Thu, 19 Feb 2015 17:38:47 -0500
Graeme,
Thank you for fielding my question. I suspected it had something to do with the way the specs had changed between v2 and v4 as you many times pointed out in the past, here and elsewhere in other forums.
Is recovering the absolute colorimetry through the chad tag very complicated?
I'm on page 93, 94, 95 of the current specs.
There's a fair amount of "Adopted White" language I had not seen before...
Thank's for the leg up!
Best / Roger
-----Original Message-----
From: colorsync-users-bounces+graxx=email@hidden [mailto:colorsync-users-bounces+graxx=email@hidden] On Behalf Of Graeme Gill
Sent: 19 février 2015 16:44
To: ColorSync
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.
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden