Say, you have a canvas size of 10"x10" in Photoshop.
Then, you have an image on that canvas (with a transparent background). Well, if you imagine the entire canvas being taken up, the total area would be 100 square inches (10x10). But, say you have an image inside this canvas. Is there a way in Photoshop, Illustrator, whatever, to figure out how much area is taken up by this image, given the canvas size?