query button image size in screen space?

yo, simple question I hope.

I have a GUI with a button and the button contains an image.

I add the image here and set it’s size to 80 x 80

however I need the image size in context of the screen space when the game is run. I am currently using ‘get tick space geometry’ and ‘get local size’ - and its giving the size of the underlying button (25 x 42)

Is there even a way to do this?

thanks,
Sam