If your photos are below our 3 megapixel recommendation, an exclamation mark will appear in the right-hand corner of your spread. When you open that spread, the image list will unfold and give you more detailed information. The warning is an indication that the photo resolution isn’t high enough, which means the photo will probably be pixelated in print. The picture can work in a small format, but for best results, photos should have at least a resolution of 10 megapixels.