3-inch photo: slightly larger than the bank card size. The size of a 3-inch photo is 55mmx84mm, and the bank card is a kind of IC card, usually 85mmx54mm, so the size of a 3-inch photo is slightly larger than that of a bank card.

4-inch photo: 4 inches is 2.67 inches * 4 inches. For example, a 4-inch cake looks like 10 cm. If the cake is square, the diagonal length of the cake is about 10.2 cm.

5-inch photo: the 5-inch photo is 8.9cm * 12.7cm ... that is, a rectangle with a length of 12.7 cm and a width of 8.9 cm. It's a little bigger than an ID card.

Common photo sizes:

1, 1 inch photo size: 2.5cm*3.5cm, 4 13*295.

2. ID photo size: 3.3cm*2.2cm, 390*260.

3.2 inch photo size: 3.5cm*5.3cm, 626*4 13.

4, 2 inches smaller (passport) photo size: 4.8cm*3.3cm, 567*390.

5.6-inch photo size: 6x4, 15.2cm* 10.2cm, 1440x960+0.3 million pixels.

6.7-inch photo size: 7x5, 17.8cm* 12.7cm,1680x1200+more than 2 million pixels.

7.8-inch photo size: 8x6, 20.3cm* 15.2cm,1920x14.403 million pixels.

8. Photo size 12 inch: 12x 10, 30.5cm*20.3cm, 2500x2000 and above 5 million pixels.