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This article is to share with you about what files jpg refers to. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Jpg file is usually an image file, which mainly adopts the joint coding method of predictive coding, discrete cosine transform and entropy coding to remove redundant images and color data. it belongs to a lossy compression format. It can compress the image in a very small storage space, which will cause damage to the image data to a certain extent.

JPG files generally refer to JPEG format.

JPEG (Joint Photographic Experts Group) is the product of the JPEG standard, which is formulated by the International Organization for Standardization (ISO) and is a compression standard for continuous-tone still images. The JPEG format is the most commonly used image file format, with the suffix .jpg or .jpeg.

JPEG (Joint Photographic Experts Group), the Joint Photographic expert Group, is a standard for continuous-tone still image compression. The file suffix is .jpg or .jpeg, which is the most commonly used image file format. It mainly adopts the joint coding method of predictive coding (DPCM), discrete cosine transform (DCT) and entropy coding to remove redundant image and color data, which belongs to the lossy compression format. It can compress the image in a very small storage space, which will cause damage to the image data to a certain extent. In particular, the use of too high compression ratio will reduce the quality of the image recovered after the final decompression, if the pursuit of high-quality image, it is not appropriate to use too high compression ratio.

However, JPEG compression technology is very advanced, it can use lossy compression to remove redundant image data, in other words, it can get better image quality with less disk space. And JPEG is a very flexible format, with the function of adjusting image quality, it allows files to be compressed with different compression ratios, supporting a variety of compression levels, the compression ratio is usually between 10 and 40, the greater the compression ratio, the lower the image quality; on the contrary, the smaller the compression ratio, the higher the image quality. For the same image, the file stored in JPEG format is the same as that of other types of files, usually only a few dozen KB, and the quality loss is small and can hardly be seen. JPEG format mainly compresses high-frequency information, retains color information well, and is suitable for application on the Internet; it can reduce the transmission time of images and support 24-bit true color; it is also widely used in images that need continuous tone.

JPEG format can be divided into three formats: standard JPEG, progressive JPEG and JPEG2000.

1. Standard JPEG format; this type can only display images in order from top to bottom when downloading a web page, and the full picture can not be seen until all the image materials have been downloaded.

two。 Progressive JPEG; this type of download in the web page, first presents the rough appearance of the image, and then slowly presents the complete content, and saved into a progressive JPG format of the document is smaller than the standard JPG format, so if you want to use images on the web page, you can use this format.

3. JPEG2000; is a new generation of image compression method, which has higher compression quality, and can improve the mosaic phenomenon and position disorder caused by signal instability in wireless transmission, and improve the quality of transmission.

Thank you for reading! This is the end of the article on what jpg refers to. I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!

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