One inch (8 sheets in a 5-inch top row) is more than 2.5*3.5cm 600*400.

Two inches smaller (one 5 inches, four in the top row) 3.3*4.8cm 600*400 or more.

Two inches (one is 5 inches, and the top row is 4) is more than 3.5*5.2cm 600*400.

Extended data:

According to the size, there are three kinds of ID photos: one inch, two inches and two inches. One inch and two inches are mainly used for various diplomas and resumes. Two inches is mainly used for passports.

Photos are photos used to prove identity on various documents. The ID photo requires a bareheaded (bareheaded) front photo. In the photo, you should normally see the outline of people's ears and the place equivalent to Adam's apple. The background color is mostly red, blue and white, and the size is mostly one inch or two inches.

References:

Baidu Encyclopedia-ID photo