What is the size of the digital photo?

3: 4 is only a proportion, regardless of size.

The size of photos is usually in inches, 1 inch ≈2.54 cm. An x-inch photo means that the long side of the photo is x-inch. For example, the length of a 5-inch photo is 2.54x5 =12.7cm; The length of 12 inch photo is 2.54x12 = 30.5cm. ..

ID card, physical examination form, etc. Most of them are one inch smaller than 22×32mm, the photo size of the second-generation ID card is 26mm×32mm, the ordinary one-inch photo is 25m× 35mm, and the photo size of China passport/travel permit is 48mm×33mm, in which the head width is 15mm ~ 22mm and the head length is 28mm ~ 33mm.

Extended data

With the popularity of card digital cameras, digital photos have become a medium for more and more ordinary families to store memories. However, in the process of taking digital photos, the demand for repairing or post-processing digital photos is increasing, and photo processing software is the product of this era. At present, the application of photo processing software mainly lies in the restoration and enhancement of digital photos.

The restoration and enhancement of digital photos refers to the deviation of photos caused by shooting conditions, camera itself or shooting methods, such as the purple edge at the junction of dark and bright parts due to the influence of backlight or strong light.

It is often called "purple edge" in photography. For example, when you shoot with a flash, you accidentally shoot the capillaries of human or animal naked eyes, which leads to red eye in the shot, which is often called "red eye" in photography. For example, due to the influence of ambient light, white objects appear non-white, and our naked eyes can judge the original color according to the ambient light, but digital cameras can't, resulting in inaccurate white balance of the photos taken. Repair and enhancement of photo processing software.