Re: MS Color Control Applet
Re: MS Color Control Applet
- Subject: Re: MS Color Control Applet
- From: Marco Ugolini <email@hidden>
- Date: Tue, 27 Jun 2006 23:30:54 -0700
In a message dated 6/27/06 7:11 AM, bruce fraser wrote:
> Marco, that's an artifact of some but not all 3D graphers. Adobe RGB
> is D65, ProPhoto is D50, and ColorThink, for example, shows some
> Adobe RGB (and even some sRGB) colors as being outside ProPhoto
> because the neutral axis is skewed.
Hi Bruce.
The ColorSync utility scales both white and black points when graphing a
profile: that way, AdobeRGB does indeed end up being completely encompassed
by ProPhoto RGB, because the AdobeRGB color space gets slightly offset by
the scaling, enough to move it all the way inside ProPhoto RGB.
But a D50 white point *is* different from a D65 white point, and differences
exist among black points. To be "Spockian" about it, it would seem logical
that these differences should be adequately represented when comparing
profiles.
Isn't that why ColorThink builds graphs of profiles using the Absolute
Colorimetric intent? Or does it not?
> In fact, ProPhoto does encompass Adobe RGB. I'm about to board a
> plane for foreign parts so I probably won't be able to discuss this
> at length, but check with reliable sources (Steve Upton, for
> example). I'm sure they'll tell you the same thing.
I do hope that Steve will be kind enough to step in and give us his opinion
on the appropriate way to view 3D graphs of profiles.
All the best on your trip.
--------------
Marco Ugolini
Mill Valley, CA
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