Hi Gerhard, This is indeed a good question... and there are some subtleties hidden here.
Let's examine a matrix-shaper profile. By its nature, a value of RGB=(0,0,0) will correspond to XYZ=(0,0,0). This XYZ is physically not realizable unless inside a black hole in the outer space, so black is mapped to a theoretical absolute perfect absorber. This implies there is a normalization or scaling on the colorimetric black point, and this is how perceptual intent works. So, I concluded matrix-shaper is implementing a sort of perceptual intent, that is, colorimetric with a black scaling. Anyway, the /RenderingIntent is only informational. Regards, Marti. ----- Original Message ----- From: "Gerhard Fuernkranz" <[EMAIL PROTECTED]> To: "Marti Maria" <[EMAIL PROTECTED]> Cc: "Lcms-User" <[EMAIL PROTECTED]> Sent: Thursday, August 14, 2003 10:58 AM Subject: Re: [Lcms-user] icc2ps, CRD and CSA > > Marti Maria schrieb: > > >>1. Though I used "icc2ps -t1 ..." the CSA contains "/RenderingIntent > >>(Perceptual)". Ist this correct? > >> > >> > > > >Yes, as far as you used sRGB profile. Matrix-shaper profiles does only one > >intent , and this is perceptual, because there is an implicit black point scaling. > > > Hi Marti, > > I think I know what you mean "with implicit BP scaling", however Table > 20 in chapter "6.3 Required tags for profiles" in the "Specification > ICC.1:2001-12, Version 4.0.0" IMO sais, that the matrix/TRC tags of > input and display profiles are to be interpreted *colorimetrically*. So > I'm a bit confused. > > Regards, > Gerhard > > > > ------------------------------------------------------- This SF.Net email sponsored by: Free pre-built ASP.NET sites including Data Reports, E-commerce, Portals, and Forums are available now. Download today and enter to win an XBOX or Visual Studio .NET. http://aspnet.click-url.com/go/psa00100003ave/direct;at.aspnet_072303_01/01 _______________________________________________ Lcms-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/lcms-user
