[argyllcms] Re: camera calibration targets
- From: Marco Noldin <marconoldin@xxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Fri, 12 Aug 2011 11:10:28 +0200
Thank you for the explanation. From the dE00 results it seems that
Photoshop can manage this profile in right way
BTW here I report my experience with the camera profiling if it helps
someone: http://www.gialandra.it/en/archives/1186
Marco
2011/8/12 "Gerhard Fürnkranz" <nospam456@xxxxxx>:
>
> -------- 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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