Common photo sizes:
1 and 1 inch photos are 2.5cm*3.5cm in size, which are often used for ID photos.
2, 2 inch photo size is 3.5cm*5.3cm, commonly used in? Standard 2-inch photo.
3. 1 inch photo size is 3.3cm*4.8cm, which is often used for China passports/visas. ?
4.5 inch /3R photo size is 12.7cm*8.9cm, which is the most common photo size.
The photo size of 5.6 inch /4R is 15.2cm* 10.2cm, which is a common photo size in the world. ?
6.7 inch /5R photo size is17.8cm *12.7cm. ..
The size of 7-and 8-inch photos is 15.2cm*20.3cm, which is about half of A4 printing paper.
8. The size of the small 12 inch photo is 20.3cm*30.5cm, which is about A4 size.
9. The photo size of12 inch is 25.4cm*30.5cm.
Extended data:
Usually, the specifications of photos are expressed in inches, which is different from the diagonal length of products such as monitors. "A few inches" in the photo refers to the length of inches on the long side of the photo. For example, a 6-inch photo is a 6×4-inch photo.
There is also a commonly used method to indicate the size of a photo in the world, which is to take the integer value of the short side of the photo and add the letter R to indicate it. For example, a 6-inch photo, the specification is 6×4 inches, which is 4R.
Generally, the ratio of photos taken by digital cameras is 4: 3 (consistent with the ratio of our monitor), while the ratio of enlarged photos is generally about 3: 2 (consistent with the length and width ratio of film negatives).
Therefore, when printing photos of digital cameras, the proportion of photos should be cut to about 3: 2, so that the printed photos just fill the whole photo paper. If you don't want to cut the photo, or the content is too full to cut, you have to leave a little white margin on the left and right when you enlarge the print.
Baidu encyclopedia-photo size