Actually, unless you're doing something exotic, like using encoded aperture or light field stuffs, most digital images do begin as a real image[1] focused on a

Actually, unless you're doing something exotic, like using encoded aperture or light field stuffs, most digital images do begin as a real image[1] focused on a sensor. 1. https://en.wikipedia.org/wiki/Real_image https://en.wikipedia.org/wiki/Real_image