What determines the photo size?

Pixel size, sensitivity, image compression quality and shooting content.

For example, high-profile photos are generally small because most of them are overexposed content. When recording, the camera only needs to write "This big piece is pure white". Intermediate tone photos are rich in gray scale, and the camera needs to record them step by step, which takes up a lot of space.

For example, black-and-white photos are generally smaller, because at this time, the camera only needs to record brightness information, and discarding all colors will of course become smaller.

The same camera/lens can take pictures of different pixels. If we choose a small frame, the actual number of pixels will be lower, so the photo will be small.

Extended data

Common photo specifications

1, 1 inch 2.5*3.5cm

2, small 2 inches 3.3*4.8cm.

3, 2 inches 3.5*5.3cm.

4, 5 inches 8.9* 12.7cm.

5, 6 inches10.2 *15.2cm. ..

6, 7 inches12.7 *17.8cm.

7, 8 inches15.2 * 20.3cm.

8 10 inch 20.3*25.4cm