The primary difference between a 4x6 vs 5x7 photo, would be the physical size and display size. A 4 x 6 print is 4 inches by 6 inches and a 5 x 7 print is 5 inches by 7 inches. The 5x7 size offers more room for details and makes photos appear a bit more prominent, according to Visuals Clipping. The 4x6 size is typically smaller and easier to use for albums, whereas the 5x7 may be preferred for portraits and framed displays.
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