-------- Original-Nachricht -------- Datum: Thu, 07 Dec 2006 17:54:24 +1100 Von: Graeme Gill <graeme@xxxxxxxxxxxxx> An: argyllcms@xxxxxxxxxxxxx Betreff: [argyllcms] Re: printer profiles - how to get max black > The black point is rather far from neutral, which perhaps hints > why there are issues. > > The explanation is that for out of gamut colors the closest color > is measured in appearance space (CIECAM02 Jab space), and it's view > of the closest point is a little different to L*a*b* space > (that's the point of using it, so that things like blue don't > go purple), and from a CAM02 perspective, the black point > returned is very slightly closer to the target L*a*b* = 0,0,0 > than RGB = 0,0,0. Graeme, doesn't the gamut mapping of 0.60 now bend the perceptual gray axis at the lower end towards device black, such that PCS CIELAB [0,0,0] (or actually the BP of the supplied source color space (profile -S ...)) should eventually always map to device black? What am I missing? Regards, Gerhard -- "Ein Herz für Kinder" - Ihre Spende hilft! Aktion: www.deutschlandsegelt.de Unser Dankeschön: Ihr Name auf dem Segel der 1. deutschen America's Cup-Yacht!