I wanna edit gimp source code for my personal specific requirements that are custom printing related, is there any way i can download edit and compile gimp code for windows and ubuntu...?
in the terminal:
$sudo apt-get source gimp
you'll end up with something like: gimp_2.8.14-1.debian.tar.xz gimp_2.8.14-1.dsc gimp_2.8.14.orig.tar.bz2
you can decompress the files, and modify them at your leisure. (compiling, in future, not guaranteed.) if you do modify the source, and recompile, I recommend running from a local directory rather than installing over the system version. At least until you know your mods are stable.