Think about it. If I write a text file using the Linux kernel (GPL) and GNU software like Gnome or Bash (also GPL) using GNU Emacs (also GPL), is that text file GPL? No.
I think that should answer your question.
To clarify, on a general basis, the copyleft aspect of the GPL only applies to when you use the code, either by extending, linking, or copying sections. Works produced using a piece of software licensed under the GPL but not its code belong to the creator and can be licensed however they want.