Re: ICC v4
Re: ICC v4
- Subject: Re: ICC v4
- From: Roger Breton <email@hidden>
- Date: Fri, 18 Nov 2005 21:48:41 -0500
>>> One of the limits of ICC V2 is that the destination profile
>>> doesn't usually know the source colorspace.
>
>> I thought that was by design.
>
> I would assume not.
I also was under the impression that this was by design. Whether it would
work or not is another issue but I distinctly remember that block diagram in
the V2 specs PDF showing how the various modules fit together like a puzzle:
there was no notion of the Destination or the Source knowing anything about
each other for the system to work. That's one point I was trying to make in
my reply to an earlier post on this subject.
> I think that practical color management
> at the time the ICC format was originally designed was relatively
> ignorant of the importance of gamut mapping, and glossed over this
> aspect in the effort to get something out there.
Ah, now that would make sense.
>> And what is scRGB?
>
> Microsoft's new wide gamut RGB.
How wide, colorimetrically? Do we know its primaries already? Is it still
gamma-based? Does it still have a white point, like D65?
> Basically a 16 bit linear sRGB,
> with device value range of -0.5 to 7.5 (rather than 0.0 to 1.0).
You mean instead of stretching from 0 to 1 in normalized units it goes from
-0.5 to 7.5?
> I think it has been submitted as an ISO standard.
Is that a good or bad thing for us poor color users?
> I get the
> impression it has been aimed at photographic input and subsequent
> reproduction.
So MS is after slicing a piece of the emerging digital photo market for
sure. They won't leave it to Apple.
> (hence the large allowance for overrange or "specular
> component" values.)
You mean the portion over 1.0 to 7.5?
> Maybe Microsoft could be using this as their
> rendering space in their XPS implementation.
I thought it was called WCS?
> Graeme Gill.
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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| >Re: ICC v4 (From: Graeme Gill <email@hidden>) |