What does the netizen mean by jpg?

Jpg is an extension of JPEG images. For images with jpg extension, by removing redundant images and color data through lossy compression, very rich and vivid images can be displayed at the same time, that is, better image quality can be obtained with less disk space.

Jpg format pictures can display very rich and vivid images while obtaining extremely high compression rate. Because of its small size, it is very suitable for applications and internet, which can reduce the transmission time of images and is also widely used for images that need continuous tones.

Extended data

PEG file formats generally have two file extensions:. Jpg and. Jpeg, and the essence of these two extensions is the same. We can rename the file *. Jpg to *. Jpeg has no effect on the file itself.

Strictly speaking, the file extension of jpeg should be. Jpeg, but due to the 8.3 file name naming principle in DOS era, PC used the extension. Jpg, and because Mac does not limit the length of extension, all Macs use suffix. JPEG at that time.

Although windows can now support extensions of any length, everyone is used to this name. Jpg, so there is no mandatory correction. This situation is similar to. Htm and. html。

Jpg compression technology is very advanced and flexible. Jpg format has the function of adjusting image quality, allowing files to be compressed with different compression ratios and supporting multiple compression levels. The compression ratio is usually between 10: 1 and 40: 1. The greater the compression ratio, the lower the mass. On the contrary, the smaller the compression ratio, the better the quality.

For example, a BMP bitmap file of 1.37Mb can be compressed to 20.3KB Of course, you can also find a balance between image quality and file size. However, jpg compression can not provide ideal results for simple works with few colors, strong contrast, solid color borders or large solid color areas.

Baidu encyclopedia -jpg/jpeg

Baidu encyclopedia -IPEG format