What's a gimp? LOL. Gimp is a graphics program like Photoshop, and is typically part of a Linux Distro.
I suspect you have a Mac since you are using the AE. I didn't know Gimp was available on Mac? But then again, OSX is BSD based.
As far as the HP goes and scanning. I don't believe that the D145 support scanning, unless it's connected directly to the computer, but I could be wrong.
Timothy N. Couch