Re: sRGB vs. sRGB IEC61966-2.1
Re: sRGB vs. sRGB IEC61966-2.1
- Subject: Re: sRGB vs. sRGB IEC61966-2.1
- From: Ian Lyons <email@hidden>
- Date: Thu, 12 Sep 2002 22:45:56 +0100
>
> different. As it was explained to me by John Gnaegy - the Apple
>
> version uses
>
> the Bradford transform and the industry standard version the XYZ
>
> transform.
>
> I'm also advised that Kodak have another variation.
>
>
The alternative to Bradford is the Von Kries transformation. All the
>
profiles Apple now ships use the Bradford transform. XYZ is a kind of
>
intermediate space called a PCS (profile connection space), and its
>
alternative is Lab. Bradford vs. Von Kries, XYZ vs. Lab.
>
It looks like I have misunderstood the "differences". Hopefully I haven't
confused matters further.
>
then
>
a 2.2 gamma curve for everything else. Apple's sRGB Profile is a 2.2
>
gamma curve for its entirety, which can be described by a smaller
>
profile.
That goes along way to explaining why Photoshop throws a "profile mismatch"
wobbler for no obvious reason. However, I also notice that the white point
and XY primaries have different values and I'm not sure of why that should
be.
Ian Lyons
http://www.computer-darkroom.com
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