Common dimensions are shown in the following table:
An x-inch photo means that the long side of the photo is x-inch. For example, the photo 1 inch means that the length of the photo is 1 inch, 1 inch =2.54 cm. 1 inch and 2/inch used in daily life have specific sizes. 1 inch indicates the photo size. 2.5cm×3.5cm； 2 inches means that the photo size is 3.5cm×4.9cm.
Extended data:
Some special photo sizes:
Hong Kong and Macao Pass: 33mm×48mm；; ;
Visa to the United States: 50 mm× 50 mm;
Japanese visa: 45 mm × 45 mm;
Two inches: 35mm×45mm；; ;
Passport: 33mm×48mm；; ;
Graduation photo: 33mm×48mm；;
Id card: 26 mm× 32 mm;
Driver's license: 22mm×32mm.