[argyllcms] Re: Misc questions about color management
- From: Kai-Uwe Behrmann <ku.b@xxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 16 Mar 2006 11:59:58 +0100 (CET)
Am 16.03.06, 10:56 +0100 schrieb FrÃdÃric:
> Hello,
>
> I have some questions, not all in direct relation with argyllcms project,
> but I don't know where to post (feel free to redirect me on a the
> appropriate list/forum), and I'm sure you have the answers ;o)
>
> 1) Is it possible to measure the white level of a monitor, in cd/m2 (is it
> what is calles IRE ?) with argyllcms tools ? Is it also possible to have a
> direct read of the white color temperature ?
The whitepoint is included in the ti3 CGATS file. It is readable if you
dont have spectral data there. It would be nice if argyll writes the
luminance tag, then it is in the monitor profile as well.
> 2) Does it exist a tool like iccexamin, but which is able to show several
> ICC profils (2D or 3D) at the same time ?
Do you want to show many profiles at the same time in a 3D/2D view? For 3D
you can load as many profiles you'd like. Argyll renders them all in the
gamut view ;-) For 2D (xy diagramm) I did not know how to do without
breaking the ui design. Any idea? The implementation is not that much a
problem.
> 3) How do I "tag" a jpeg or tiff file with a specified colorspace ? Where is
> this information stored ? EXIF "colorspace" field for jpeg ?
>
> 4) My Canon 20D camera is able to use AdobeRGB98 or sRGB colorspace when
> converting to jpeg. This can also be done outside when shooting in Raw. In
> both cases, what does it mean ? I suppose that 20D colorspace is neither
> AdobeRGB98 nor sRGB. So, how is converted the Raw file, say to AdobeRGB98 ?
> Do prgrams (inside or outside) consider that sensor values *are* in
> AdobeRGB98/sRGB colorspace ?
The sensors are in theyre own color space. Assigning sRGB or AdobeRGB is a
convenience function of the camera software. You should profile your
camera individually with a IT8 camera target. With the resulting camera
profile you can convert you image to a proper editing space eighter on the
command line or in CinePaint during loading.
> Thanks for your help.
>
> --
> FrÃdÃric
>
> http://www.gbiloba.org
>
regards
Kai-Uwe Behrmann
+ development for color management
+ imaging / panoramas
+ email: ku.b@xxxxxx
+ http://www.behrmann.name
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