Looking at 4x6 vs 5x7 photo dimensions,, the 5x7 size offers more area. A 4x6 print is 24 square inches and a 5x7 print is 35 square inches. The extra space can add more “weight” to a single photo when it is on display alone, as Visuals Clipping explains. However, the 4x6 format is still smaller and more practical for albums or for small frames. This can then be based on the space available and either the purpose of the printed photo or the prints themselves.
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https://www.visualsclipping.com/blog/4x6-vs-5x7-photo-size/ 
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