[argyllcms] Re: camera calibration targets

  • From: "Gerhard Fürnkranz" <nospam456@xxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Fri, 12 Aug 2011 10:53:09 +0200

-------- Original-Nachricht --------
> Datum: Fri, 12 Aug 2011 09:00:45 +1000
> Von: Graeme Gill <graeme@xxxxxxxxxxxxx>
> An: argyllcms@xxxxxxxxxxxxx
> Betreff: [argyllcms] Re: camera calibration targets

> Because it objects to the -ve values, because the ICC spec.
> forbids them.

Hi Graeme,

I'm actually wondering how the following note in the ICC spec should be 
interpreted?

  "5.1.11 XYZNumber
  ...
  "NOTE 2: Signed numbers are employed for this type to
   accommodate negative values arisiing during calculations."

> [The ICC is in error in not allowing -ve values, since
>  such values are perfectly valid in matching the response
>  of input devices, even though they are much less likely in
>  matching the response of output devices that would have to
>  have primary colorants with such XYZ values. ]

Best Regards,
Gerhard

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