图片的几种格式,有什么区别（What is the difference between several formats of pictures）.doc

图片的几种格式,有什么区别（What is the difference between several formats of pictures） What is the difference between several formats of pictures? 1. BMP format BMP is the abbreviation of Bitmap (Bitmap) in English, which is the standard image file format in the Windows operating system and is supported by a variety of Windows applications. With the popularity of the Windows operating system and the development of rich Windows applications, the BMP bitmap format has been widely used. This format is characterized by richer image information and almost no compression, but it leads to its inherent weakness - excessive disk space. So, currently BMP is more popular on single machine. Ii. GIF format GIF is an abbreviation for Graphics Interchange Format (Graphics Interchange Format) in English. As the name implies, this format is used to exchange images. In fact, in the 1980s, CompuServe, a well-known online messaging service in the us, developed the GIF image format for the limited bandwidth of the Internet at that time. The GIF format features compression ratio and low disk space, so the image format has been widely used. The original GIF simply used to store a single static image (called GIF87a), then with the development of technology, several static image can be stored at the same time, in turn, to form a continuous animation, making it was one of the few formats support 2 d animation (called GIF89a), and can be specified in the GIF89a image transparent area, make image has exceptional display effect, this makes GIF scenery is dye-in-the-wood. Currently, a large number of color animation files on the Internet are files of this format, also known as GIF89a format files. In addition, considering the situation of the network transmission, GIF image format also increased the fade-in way, that is to say, in the process of image transmission, the user can see the outline of the image first, and then gradually with transmission process continue to see the details of the image, so as to