How to change a picture using linux?

I use image editor gimp i think and i need to know how to change the bit for this custom theme creator.How to change a picture using linux?
Here are the Official GIMP Tutorials http://www.gimp.org/tutorials/ they will also be useful for future reference.



LUg.How to change a picture using linux?
If you know how to use gimp in Windoze you know how to use it in Linux. Your question is very ambiguous though. If you are have problems executing it do %26quot;sudo chmod a+x gimp%26quot;