Re: Weird output profile behaviour
Re: Weird output profile behaviour
- Subject: Re: Weird output profile behaviour
- From: Steve Upton <email@hidden>
- Date: Fri, 30 Sep 2005 16:45:10 -0700
At 8:11 AM -0700 9/30/05, Matthew Larmour wrote:
>I have an CMYK output profile (that I didn't create) that I believe is acting odd.
>
>The perceptual rendering intent produces *much* higher saturation that the relative colorimetric intent. I know that profiling apps are free to build perceptual rendering as they want, but my experience with other profiles has been that the perceptual intent produces lower saturation that R.C. I get far better colour matching using the perceptual intent, while rel. col. seems to produce suspiciously blue results.
sounds odd indeed.
>As well, the relative colorimetric intent produces *identical* results to absolute colorimetric. So if I convert an arbitray L*a*b* colour to CMYK using this profile, I end up with the exact same device values from either intent.
this probably means that the white point in the profile is D50 rather than an actual paper white measurement.
>Does this seem weird and/or wrong? Or is there something I'm missing? It's almost like the absolute rel. tables ended up as well in the rel. col. tables,
abs col and rel col use the same table. They just use the white point differently
> and the rel. col tables ended up in the perceptual slot. Is this possible?
not by accident but perhaps on purpose by someone messing with it.
Either that or odd gamut mapping. Do you know who built the profile and what software they used?
Regards,
Steve
________________________________________________________________________
o Steve Upton CHROMiX www.chromix.com
o (hueman) 866.CHROMiX
o email@hidden 206.985.6837
o ColorGear ColorThink ColorValet ColorSmarts ProfileCentral
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