Re: The color of gray
Re: The color of gray
- Subject: Re: The color of gray
- From: Florian Höch <email@hidden>
- Date: Mon, 01 Sep 2014 17:40:05 +0200
Am 01.09.2014 um 16:53 schrieb Roger Breton:
>> ... because around a decade ago Adobe decided they would no longer
>> support absolute colorimetric for RGB display profiles (you can
>> select it, but it'll use relative colorimetric behind your back).
>
> See?
>
> I think that this "Rendering style" has even officially been made
> part of the ICC specs in v4? (Was that was Graeme Gill complain was
> about in his multiple objections on change in the Media White Point
> between v2 and v4 specs?)
Technically it should be possible to do absolute colorimetric using v4
display profiles, as the device white -> pcs white transform is (or
should be) encoded in the "chad" tag, the problem is just that no CMM
out there (atleast that I know of, with the exception of littleCMS)
seems to support it. I think I share Graeme's view on this, the v4
change seems a little pointless to me aswell because I fail to see what
is gained by it, while what you loose is pretty clear. The only thing
one really gains by the v4 change is the ability to explicitly encode
the actual chromatic adaptation transform matrix used.
> Personally, I never agreed with this change for there was nothing I
> liked more to demonstrate the concept of color temperature than fire
> up an Absolute Colorimetric conversion in Photoshop from, say, sRGB
> =255,255,255 to Lab. That was one hell of an eye opener. But, we all
> know the vast pool of uninformed Photoshop's users have so much power
> on Adobe that, in order to keep peace, Photoshop's team threw the
> towel and came up with the present behavior. I personally regret this
> change.
Thinking about it, maybe it is possible to trick Photoshop into doing
absolute colorimetric with a (ICCv2) display profile, by changing the
profile class from "mntr" to "prtr" using a hex editor. I've not tried
this though, and chances are that Photoshop will just reject such an
altered profile.
--
Florian Höch
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