Re: ICC v4
Re: ICC v4
- Subject: Re: ICC v4
- From: Graeme Gill <email@hidden>
- Date: Fri, 18 Nov 2005 19:13:07 -0800
Roger Breton wrote:
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?
Same primaries as sRGB, but with an expanded device value range,
which expands the gamut.
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?
Yes.
I think it has been submitted as an ISO standard.
Correction - IEC standard.
Is that a good or bad thing for us poor color users?
Probably good that it's a real standard, as oppposed to
a purely Microsoft thing.
(hence the large allowance for overrange or "specular
component" values.)
You mean the portion over 1.0 to 7.5?
Yes.
Maybe Microsoft could be using this as their
rendering space in their XPS implementation.
I thought it was called WCS?
No, they are separate things. XPS is the
so called "PDF killer", a page description language.
It seems to depend on ICC profiles for it's color
definitions. If it needed WCS to run, then it couldn't
be used on anything other than a MSWindows box, which
I guess would limit its usefulness.
Of course the ICC profiles can have WCS profiles embedded inside
them.
Graeme Gill.
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| >Re: ICC v4 (From: Roger Breton <email@hidden>) |