[Digikam-users] Some color management questions

[Gys van Zyl]

I don't use the color management features of digiKam, so I can't give you
any guidance there.  What you can do is to open one of his jpegs in Gimp and
choose to convert to sRGB when Gimp prompts to do so.  You will then have a
better idea of what your friend intended the photo to look like.

On Sat, Jun 13, 2009 at 2:35 PM, Rainer Krienke <krienke at uni-koblenz.de>wrote:

> Hello,
>
> i run digikam 0.10 on my openSuSE 11.1 box. All my photos are in sRGB
> colorspace. JPG files I convert from my cameras NEF files (using bibble)
> are
> also in sRGB. In digikam colormanagement is disabled. So far so good. Up to
> now I never had any color problems.
>
> Today a friend send me some JPG photos. I know he also shoots in RAW (Nikon
> D300) and then converts these files into either tiff or JPG. We spent a
> holiday together and now exchanged some photos, he sent me JPG files. He is
> working with windows, I guess to remember he is using Nikon Capture and
> Adobe
> Photoshop to process his photos.
>
> When I saw his photos and compared them to mine the first thing that I saw,
> was that color saturation in all of his photos looks to me rather small.
> Some
> photos actually look a little pastel-colored and there is some yellow tint
> in
> quite all of his photos. Color is not completely wrong but looks in my eyes
>  a
> little strange.
>
> I looked at the photos XMP metadata where I found a Photoshop section. In
> this
> section there is an entry "ICCProfile" with a value of "Adobe RGB (1998)".
>
> - Does this mean that color in these JPGs is in Adobe RGB 1998 and not in
> sRGB? If yes then perhaps this difference in colorspace could be the reason
> for the pale colors, couldn't it?
>
> - What should digikam actually do with a photo that is in Adobe RGB color
> space?  Would it be automatically convert it to sRGB when I look at it? Do
> I
> have to activate colormanagement in digikam to get things right even if I
> just
> want to look at these photos?
>
> - Can a JPG actually contain an image in Adobe RGB or is (or should be) the
> colorspace by definition sRGB in all JPGs?
>
> I am actually unsure if I really have a color problem or if everything is
> the
> way it should be, but since my friend does not live next door I cannot just
> take a look on his monitor to see if he intended this "special" color look.
>
> Thanks for your help
> Rainer
>
> --
> Rainer Krienke, Uni Koblenz, Rechenzentrum, A22, Universitaetsstrasse  1
> 56070 Koblenz, http://www.uni-koblenz.de/~krienke<http://www.uni-koblenz.de/%7Ekrienke>,
> Tel: +49261287 1312
> PGP: http://www.uni-koblenz.de/~krienke/mypgp.html,Fax<http://www.uni-koblenz.de/%7Ekrienke/mypgp.html,Fax>:
> +49261287 1001312
>
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