[Digikam-users] color profile input: a question

[Gilles Caulier]

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