What's the difference between the screen size and resolution of video?

The picture size and resolution of video are different in definition and practical significance, and cannot be equated.

1, different definitions

Screen size: the screen size refers to the length and width of the screen, which is an absolute size.

Resolution: The number of pixels contained in a unit inch.

2, the practical significance is different.

Screen size: refers to the actual size of the screen border, usually in centimeters or inches.

Resolution: Based on pixels, resolution determines the fineness of bitmap image details. The higher the resolution of an image, the more pixels it contains and the clearer the image.

Generally speaking, the picture size of video refers to the size of the picture border, which is an absolute size; The resolution of video refers to the clarity of video, which is a relative size.

Extended data:

Traditionally, resolution refers to the high/wide pixel value of an image, and in a strict sense, resolution refers to the effective pixel value per unit length. This is the difference. The height/width pixel value of an image is really independent of the size, but the effective pixel value per unit length is related to the size. Obviously, the larger the size, the smaller the effective pixel value per unit length.

When the video window is small, the effective pixel value per unit length is high and looks clear; When the window is enlarged, because there are not so many effective pixels to fill the window, the effective pixel value decreases and becomes blurred.

Baidu Encyclopedia-Video Resolution