[argyllcms] Re: R: Re: Neutralize Grey Axis
- From: "Gerhard Fürnkranz" <nospam456@xxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Mon, 10 Jan 2011 18:06:52 +0100
-------- Original-Nachricht --------
> Datum: Mon, 10 Jan 2011 23:41:56 +1100
> Von: Graeme Gill <graeme@xxxxxxxxxxxxx>
> An: argyllcms@xxxxxxxxxxxxx
> Betreff: [argyllcms] Re: R: Re: Neutralize Grey Axis
> Klaus Karcher wrote:
> > Quote from ProfileMaker Documentation:
> > "Perceptual Rendering Intent Option
>
> > Note: This corresponds to relative colorimetry in highlight areas and
> > absolute colorimetry with shadow compensation in the remaining colors.
> > Note: The default and recommended setting is Neutral Gray.
>
> Hi Klaus,
> thanks for the clearer explanation. It's difficult to believe
> that the "Neutral Gray" option gives results that people actually find
> useful though, particularly for relative colorimetric. I can understand
> using this sort approach as a hybrid "absolute colorimetric" type intent,
> but the results with typical source colorspaces (ie. sRGB with a D65
> white point) could only look peculiar - very blue looking neutrals
> until they switch to the D50 paper white near white !
Graeme, I guess it is rather not like absolute colorimetric in the traditional
sense, but more like "ICC absolute", i.e. a perceptual transformation which
basically maps the PCS gray axis [0,0,0]...[100,0,0] to a gray axis with
illuminant chromaticity (not paper chromaticity), while scaling down the
luminance (from 100 to paper white) and possibly bending the gray axis towards
paper white at the top in order to avoid the otherwise inevitable clipping.
Regards,
Gerhard
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