For a sharp print, an image should ideally be 300 DPI. A 2560x1440 image is roughly 8.5 x 4.8 inches at high quality. If you want a larger poster, you might need a 4K resolution image instead.
Use heavyweight matte or satin photo paper to capture the dark, atmospheric details of Hogwarts without the glare of high-gloss finishes.
This platform offers a filtered Harry Potter collection specifically for QHD/16:9 displays.