I’m guessing it’s a small photo resized by the frame to fill the frame? Double check your camera and the photos to make sure they really are all the same size in pixels. I bet you’ll find they are NOT! If the frame just uses a pixel-to-pixel resize algorithm, the photo will appear pixelated. Find out the frame’s resolution and then use Photoshop to resize the photo and crop it to the frame’s dimenstions in pixels. If the original photo is tiny, say 100 by 100 pixels, you’re going to get pixelation now matter how good the resize algorithm is that you use.