Hi Lin, here is more details. The size is at maximum 3872x2592 but it is different for all images (jpg). I have slides both horizontal and vertical. I tried to fix the feature "fit to slide" but this is an option I can change one by one and not for all together (at least this is what I understood). In the project option (and this is valid for all images) I set 4:3 full screen and 100% the size of the window in the screen. I prepare the slides via Nikon NX software. If I have to resize out of pte all images, what is the right size? Thanks. Mauro