[argyllcms] Re: sRGB/AdobeRGB98 vs Lab
- From: Frédéric <frederic.mantegazza@xxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Mon, 20 Mar 2006 15:06:09 +0100
Le Lundi 20 Mars 2006 14:26, Graeme Gill a écrit :
> > Marti Maria (LittleCMS) said that sRGB covers 80% of the colors a human
> > can see. I was very surprised, because sRGB covers only 30% of Lab
> > colorspace (in area), and AdobeRGB98, 50%. I thought that Lab
> > represents all colors a human can see. So, are sRGB/AdobeRGB98 cover
> > nearly all colors, or not ? If not, what are the colors from real world
> > which can't be represented ?
>
> L*a*b* space contains a large volume of non-real colors. You can't
> reproduce 0, 100, 100 for instance, and technically, there
> is no limit to the a* and b* values, so the L*a*b* volume is
> infinite.
>
> The visual gamut is contained within the spectrum locus,
> but it's total extent goes a bit outside the ICC L*a*b*
> limits of a* and b* being between -128 and 127.
>
> (I haven't quite figured out how to make a Lab plot of the
> total visual gamut to compare with sRGB or AdobeRGB98, so
> I can't comment about that.)
In fact, I made a mistake : sRGB is about 30% of xyY diagram area. Does this
diagram also contain non-real colors ?
--
Frédéric
http://www.gbiloba.org
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