The 6-inch photo reference object is about the same length as an ordinary smartphone.

6-inch photos are a common photo size in the world, measuring approximately 15.2 cm × 10.2 cm, and 1 inch is equal to 2.54 cm. The reference object for 6-inch photos is about the same length as an ordinary smartphone.

The size of the 6-inch photo is 152mm×102mm. The size of photos is generally measured in inches. One inch is approximately equal to 2.54 centimeters, which is equal to 25.4 millimeters. The size of the photo refers to the length of the photo in inches. For example, the length of a 6-inch photo is 2.54x6=15.2cm.

As for the size of photos, domestic standards and international standards are different.

The domestic standard refers to the diagonal length of the photo, measured in inches. We usually refer to this standard when the photo is one inch, two inches, and six inches. International photos are measured based on the length of the bottom edge of the photo (that is, the longest side), and are also measured in inches. The 3R5R we call is based on this standard.

Nowadays, more and more of us are using international standards, but some people still use the old domestic standards, so we must ask this question clearly when developing photos. ?

In addition, it should be noted that the photos taken by digital cameras are usually in the ratio of 4:3 (the same as the ratio of our monitors), while the ratio of enlarged photos is about 3:2 (the same as the film negative The length-to-width ratio is the same), so when enlarging a photo from a digital camera, you generally need to crop the photo to a ratio of about 3:2, so that the enlarged photo just fills the entire photo paper.

If the photo does not want to be cropped, or the content of the photo is too full and there is no room for cropping, you have to leave a little white margin on the left and right sides when enlarging the print.