There's a bug in Gimp 2.8 that makes a green border around colored text if anti-aliasing is on. Since I need the text clear, turning it off is not an option.
I've found some answers for Gnome that describe turning off cleartype in Gnome.
Which config file should I look for to turn this off in my Waldorf system?
Oh I never thought that exporting bitmaps would be that easy in Inkscape and my tablet likes this piece of software even better. Thanks for the tip!
There is another solution to this problem. In ~/.fonts.conf remove the following section :
<match target="font"> <edit mode="assign" name="rgba" > <const>rgb</const> </edit> </match>