How to change UI colors for gitk?

I use gitk for keeping an eye onto branches, commits and so on ... I am running Ubuntu 14.04. and noticed that the background color of the branch label is different in comparison to what I am used to on another machine running Ubuntu 13.10. Currently I have Git 1.9.3 installed.

Branch in gitk

Is there a way to customize the background color of the branch label in gitk?

Solution

That appears to be the headbgcolor, which is not available from the GUI colour settings.

Close gitk, then modify ~/.config/git/gitk (or ~/.gitk, check whether either of these files exists already) and change

set headbgcolor green

to some other colour. Hex codes appear to be supported unquoted, e.g.

set headbgcolor #123456