Hello, I am a recent user of Processing and I have a question about a function, i am using this piece of code to save the project.

void gravar()
{
  String dest = selectOutput();
  save(dest);
}


My program is a basic image editor, i have a menu and a drawing area, when i use that code the program saves everything the menu and the drawing area.
My question is, can i use some kind of code to narrow down the save area? I only want to save the drawing area not the menu.
Please help me, its important.