[Digikam-users] color profile input: a question

[F.J.Cruz]

El Viernes, 1 de Septiembre de 2006 07:44, Gilles Caulier escribió:
> Le Jeudi 31 Août 2006 23:15, F.J.Cruz a écrit :
> > El Jueves, 31 de Agosto de 2006 23:00, Heiner Lamprecht escribió:
> > > On Thursday 31 August 2006 22:44, F.J.Cruz wrote:
> > > > El Jueves, 31 de Agosto de 2006 22:10, Mathusael escribió:
> > > > > I think that I get almost all my answers in previous post, but
> > > > > "color profile input" are still puzzling me... I am using a
> > > > > Minolta 7D for my shooting and I ask the camera to work/tag in
> > > > > AdobeRGB mode. However their is no way I can convince Digikam
> > > > > to use AdobeRGB as an input mode in the Digikam
> > > > > "Configuration/Configure/ColorManagement" menu. It seems to
> > > > > wait for a camera specific icm profile.
> > > >
> > > > You can't select AdobeRGB profile as input color profile because
> > > > it isn't an input device class profile: it's a display device
> > > > class one.
> > >
> > > But then, why can I configure my camera to save files in AdobeRGB?
> > > If I open such a file, digikam also tells me, that it is AdobeRGB
> > > embedded.
> > >
> > >
> > >
> > >     Heiner
> >
> >  There are 2 options:
> >
> > - Your camera is doing the conversion from and unknown profile to
> > adobeRGB and is embedding this one into the image.
>
> In my Dynax 5D all JPEG file taken using AdobeRGB color space use the .JPE
> file extension.
>
> > - Your camera isn't doing the conversion, but it's embedding such icc
> > profile.
>
> and 3rd possiblilty : the camera use the exif.image.colorspace tag to set
> the right color space use to transform the image : 0 = undefined, 1 = sRGB,
> 2 = AdobeRgb, 0 = undefined, 65535 = uncalibrated. Look here :
>
> http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/EXIF.html
>
> ...and search colorspace tag. digiKam parse this tag value when image is
> loaded in editor and embedded automaticly the right icc color space
> profile.
>
> > In my modest opinnion, if you are working with RAW images, then there is
> > no conversion and the profiles is embedding only.
>
> Some cameras do it, but this is have a non-sence with a RAW file : this one
> must be transformed in a computer after downloading. There is no color
> trnasformation performed by camera.
>
> Gilles

I agree, makes no sense a camera which save raw images with some type of 
transform because a raw image is, per se, a 'as-is-taken' image.

Paco.