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.

In addition, regardless of the number of pixels of a digital film, only look at the number of pixels on the long side, 1200 is 5 inches, 1400 is 6 inches, 1700 is 7 inches, and so on.

When we say x inches, we mean the long side of the photo. For example, 5 inches means the photo is 2.54x5= 12.7cm, 12 inches means 2.54x 12=30.5cm, and 8x 12 means the long side is 2.54x12 = 30.5cm. ..

3R refers to paper, 3R is 89MM, 5R is 127MM, usually 3R refers to 3*5, which means 5 inches, and 5R refers to 5*7, which means 7 inches. R represents a rectangle, calculated on the shortest side.

The bar chart is generally 16:9.

Horizontal version 1 inch 36mm*27mm, 2 inches 35mm*53mm, 5 inches 127mm*89mm, 6 inches 152mm* 102mm, 7 inches178mm */kloc.