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.
ID card, physical examination form, etc. Most of them are one inch small, 22×32mm, the photo size of the second-generation ID card is 26mm×32mm, the ordinary one-inch photo is 25 mm× 35 mm, and the photo size of China passport/travel card is 48mm×33mm, in which the head width is 15mm ~ 22mm and the head length is 28 mm ~ 33 mm.
Extended data:
Naming method of photos:
1, directly describe;
This method is to write out the content of the photo directly.
2. Time and place;
In addition to directly describing the content, you can also directly write down the time and place of shooting.
3. Shooting equipment;
List all the equipment and details used in shooting in the photo name.
4. Tell stories;
Take the story behind the photo as the topic. Be careful not to add personal prejudice.
5. System naming;
This method directly uses the name automatically generated by the camera. General websites use EXIF information to identify photos, and this naming method is generally adopted for photos processed in batches.
Baidu encyclopedia-photos