Aspect Ratio: The relationship between the horizontal and vertical dimensions of an image. A 35mm film frame has an aspect ratio of 3:2, which is the same as a standard 15 x 10 cm print but doesn’t match the aspect ratio of A4 printing paper. Most digital cameras produce images with a 4:3 aspect ratio, although many also offer the 16:9 aspect ratio used by widescreen TV sets and some add 1:1, which produces square pictures. When the image aspect ratio does not match the aspect ratio of the printing paper, the image or print may need to be cropped or you may elect to print the picture smaller than the paper, with white borders around it.