I'm trying to make a .sty template, but I cannot figure out how to define a dedicated background canvas for the "part page" frames.
Here (How to add background only to title frame and an other only to the last frame?) is a solution for when it is possible to characterize the background depending on the frame number, but it cannot be applied in my situation.
So is there a way to test the "type" of frame? (like "title page", "part page", ...). If yes, it means I can do the same as the solution to sandoche's problem. If not, can anybody think of a workaround?