The corresponding centimeter is: 15.2cm* 10.2cm.

The size of the photo is in inches, 1 inch =2.54cm, and usually x inch refers to the inch length of the long side of the photo. For example, 5 inches means that the photo length is 2.54x5 =12.7cm; 12 inch means that the photo length is 2.54x12 = 30.5cm..

ID cards, physical examination forms, etc. are mostly 22×32mm small, 26mm×32mm second-generation ID cards, and 25mm×35mm ordinary one-inch photos. The standard photo size of passport and travel document is 48mm×33mm, the head width is 21mm ~ 24 mm, and the head length is 28 mm ~ 33 mm).

The rest of the photos are as follows:

1 inch 1 inch * 1.5 inch 2.5cm*3.5cm

2 inches 1.5 inches *2 inches 3.5cm*4.9cm?

5 inches/3R5inches *3.5 inches12.7cm * 8.9cm.

7 inches /5R 7 inches *5 inches17.8cm *12.7cm.

8 inch 6 inch *8 inch15.2cm * 20.3cm.

Small 12 inch 8 inch * 12 inch 20.3cm*30.5cm

12 inch 10 inch * 12 inch 25.4cm*30.5cm?

The maximum resolution that the human eye can distinguish is 300dpi. Beyond this resolution, the human eye cannot see the difference, that is to say, there is no difference between 300dpi and 600dpi, so the maximum design output resolution of the current printing equipment is 300dpi.

Of course, everyone's requirements for clarity are different. Generally speaking, 200dpi can satisfy most people, so printing a 6-inch photo with 2 million pixels is still very clear to most people.

"Print size" has a great relationship with the image resolution. As long as the image resolution changes, the print size will change accordingly, and there is a direct relationship between pixels and image resolution, so the three can be converted to each other. And the most fundamental one is the pixel.