May I take the chance to promote one of my solution regarding changing colors in photos? Though it is a tiny command line solution, still if one doesn't intend to spend much time by fixing colors manually, I created a fully automatic solution to adjust the saturation, gamma and contrast in a photo (C, GPL'd open source). Though it has nothing to do with the subject in features or whatsoever, I reckon it may be a frequent task to do for many and should not by all means use a foreign repo but just compile it or use the static version.

http://log69.com/aaphoto_en.html
https://github.com/log69/aaphoto

Cheers.


On Mon, 1 Jul 2013 22:01:21 -0700
Yasha Karant <[log in to unmask]> wrote:

> There is an open source application that appears to compete with GIMP 
> plus plugins for handling digital camera images.  The package is called 
> darktable,
> 
> URL:
> 
> http://www.darktable.org/about/
> 
> The claim is that it will install under SL6, preferably X86-64
> RHEL 6 / SL 6 / Centos 6, using the following sequence:
> 
>          install the linuxtech.repo config file if you don't have it 
> already:
> 
> su - root
> cd /etc/yum.repos.d/
> wget http://pkgrepo.linuxtech.net/el6/release/linuxtech.repo
> 
>          install darktable:
> 
> yum --enablerepo=linuxtech-testing install darktable
> 
> Does anyone have experience with either this application or the 
> linuxtech repository?  Does anyone know if this is a "safe" repository 
> to use?  Had EL proper polymorphism and encapsulation, this sort of 
> issue would not arise; however, under the present design, if a 
> repository (e.g., linuxtech) overwrites a systems library, etc., the 
> results can be less than desirable.
> 
> Yasha Karant