What are the common dynamic image file formats?

GIF (the original meaning is "image exchange format"), and the data of GIF file is a continuous tone lossless compression format based on LZW algorithm. Its compression ratio is generally around 50%, which does not belong to any application. GIF format can store images of multiple colors. If the data of multiple images stored in one file are read out one by one and displayed on the screen, the simplest animation can be formed.

2.SVG format

An open standard vector graphics language allows you to design exciting high-resolution web pages. Users can draw images directly with codes, open SVG images with any word processing tools, and make the images have interactive functions by modifying some codes. They can insert HTML at any time and view them through browsers.

Extended data:

GIF picture consists of many pixels, each pixel is given a color, and these pixels are combined to form a picture. GIF adopts LZW(lem pel-Zev-Welch) compression algorithm, which supports up to 256 colors. Because of this feature, GIF is more suitable for pictures with less colors, such as cartoon shapes, company logos and so on. If you need to use true color, then the expressive power of GIF is limited.

GIF usually comes with its own color palette, which stores all the colors you need. In Web applications, the file size of an image will obviously affect the download speed, so we can optimize the color palette according to the characteristics of GIF with color palette, and reduce the number of colors used in the image without affecting the image quality (some unused colors in the image can be discarded).