gcm with Gimp, EOG, Darktable & Co

[Florian Neukirchen <riannek web de>]

Hi,

I am trying to figure out how to get gnome-color-manager (on fedora 16 /
gnome 3.4) to work together with graphics applications. I stumbled over
a mail by Øyvind Kolås, saying the opposite of every other website I've
read (e.g. http://blog.pcode.nl/2012/01/29/color-management-on-linux/).

"you most likely are better off working directly in sRGB in GIMP with
color management disabled. Letting colord / gnome-color-manager or
similar do it's job of adjusting sRGB according to your displays
profile. Having both global color correction and GIMP's display filter
would lead to double correction and thus incorrect results."

https://mail.gnome.org/archives/gimp-developer-list/2012-April/msg00108.html

The point is, with the profile I created with gnome-color-manager, I get
a decent result (comparing screen with test images) as long as "use
system profile" is switched off in GIMP 2.6 / Darktable 1.0. However,
with EOG 3.2, grey darker as 20 % already looks black, making EOG
useless. The same happens with GIMP and Darktable using the system
profile.

Quite the opposite, using KDE Showfoto with the same profile manually
set, dark grey is OK, but midgrey looks brighter than it should. 

Test images look good in Firefox and Sushi.

Should system profile be unchecked in Gimp / Darktable? 

Unrelated to this, if my external monitor is unplugged during login, gcm
fails to set the profile for my primary monitor, I have to do it
manually in the color preferences panel.

Thanks for your help
Florian