Optimization of Gif images-search engine technology

Graphics are a major component of the network. If there are no images in the web page, it will become very dull and boring. However, I often find that some sites are too large because of the large graphics, the website is opened quite slowly. Many visitors are impatient to wait for such a long time and often turn around and leave. The optimized images are a good sign of site design, and they first reflect the technical level of website developers. Next, we will perform in-depth parsing on the GIF file format and how to optimize the GIF file on the website. Let's start with the following two simple questions: What is image optimization? The so-called image optimization is to minimize the size of the image file, and there will be no (too large) change in the image appearance. Why is network graphics optimized? The smaller the file size on the network, the faster the download speed, and the faster the website content is displayed to the user. GIF-related basic theories GIF is the abbreviation of Graphics Interchange Format. It is a high compression ratio color image file Format launched by CompuServe in 1980s. GIF adopts the LZW (Lempel-Ziv & Welch) algorithm, which is highly efficient in lossless data compression, and targets 8-bit color images. GIF is the only format supported by all graphics browsers. The LZW algorithm constructs a color table for the graph. Each color in the graph corresponds to a pixel. Therefore, images that contain a large area and the same color block have an ideal compression effect. Compared with other formats, GIF is more suitable for line charts and enterprise identities. Similarly, the LZW algorithm calculates the prime number of the image that changes from the water square to the upward direction. Therefore, a horizontal color change is larger than a vertical color change. The GIF compression algorithm is a lossless data compression method. When the original image is converted to the GIF format, no information is lost. (Note: If your original image contains more colors than 256 colors, some information will be lost. However, once converted to GIF format, there will be no loss of information .). GIF image optimization: The size of a GIG image depends on: 1). Shape height (width and height) of the image ); 2). Number of colors included in the image; 3). Graphics complexity; 1). Shape height (width and height) of the image) The standard graphic editing program provides a "Crop" cropping tool, which can be used to Crop the image and remove the unwanted part of the image. The Crop tool is quite simple to use.