One thing I learned from our friends the Barnharts in Bend Oregon, is that you can use your flat screen TV as a photo frame. There are three USB ports and all you have to do is plug in a device with your photos and away you go. So, I put our Alaska pictures on a thumb drive and had a good look at them on the big screen. Very nice.
Good question. Actually, no problem. I reduce them to 1920x1080 which is the screen resolution. They look very nice. I figure that you might as well match the screen resolution.