I'm not exactly sure how to phrase this, so I've been having a hard time finding information in a search. I have an image with a canvas size of 1800 by 2700 pixels. One layer contains a photo that's 5460 x 1698. I'd like to delete all the excess of that photo. Basically everything outside the 1800 x 2700 canvas. I've tried cropping, clipping the canvas, and erasing, but nothing seems to work. (The eraser is not working at all on that layer for some reason.) My file is huge because of all this extra stuff in the background. Is there some simple way of getting rid of it? Does one of the tutorial videos cover this topic?
