Apologies if I have missed any similar existing topics or made any errors, I’m new to the forum and to ImageJ!
I’m looking for a method to create an area of a given radius or diameter around a pre-existing freehand selection. For context, I am looking at a photo of a bird on a nest and I have used the freehand selection tool to outline the adult bird. I am looking to then be able to create an area of perhaps 400pixels in diameter around that current selection (not just a circle, it would be relative to the freehand selection).
If anyone has any advice or suggestions it would be greatly appreciated!