Common image formats

First, WEBP by Google launched a new generation of image format, in terms of compression than the current JPEG format more superior. As with JPEG, WEBP is a lossy compression. But Google says the main advantage of this format is efficiency. In the same quality situation, the WEBP format image is 40% smaller than the JPEG format image. In the ointment, the encoding time of the WEBP format image is 8 times times longer than the JPEG format image. Although the WEBP format has not yet been broadly supported by a variety of hardware and software like the JPEG format, Google's advantage in promoting this format is in the Chrome browser.   BMP format   BMP is a shorthand for English bitmap (bitmap), which is a standard image file format in the Windows operating system and can be supported by a variety of Windows applications. This format is characterized by the richness of the information contained in the image, which is hardly compressed, but which leads to its innate disadvantage-taking up too much disk space.   GIF format   GIF is an abbreviation for the English Graphics Interchange Format (Graphics interchange). GIF format is characterized by high compression ratio, less disk space consumption, so this image format has been widely used. With the development of technology, several still images can be stored at the same time to form a continuous animation, making it one of the few formats supporting 2D animation at that time (called gif89a). In addition, in view of the actual situation in the network transmission, GIF image format also increased the fade way. But GIF has a small drawback that it cannot store more than 256 colors of images. However, this format is still on the network of the large-scale application, which and the GIF image file short, download speed, many of the same size can be used to make the image file animation and other advantages are inseparable.   Four, JPEG format   JPEG is also a common image format, it was developed by the Joint Photographic Experts Group (Joint Photographic Experts Group) and named "ISO 10918-1", JPEG is only a commonly known. JPEG files with the extension of. jpg or. jpeg, the compression technology is very advanced, it uses lossy compression method to remove redundant images and color data, obtain a very high compression rate at the same time can display a very rich vivid image, in other words, can use the least disk space to get better image quality. JPEG is also a very flexible format, with the ability to adjust image quality, allowing you to compress this file with different compression ratios.   V, JPEG2000 format   JPEG 2000 is also the responsibility of the JPEG organization, it has a formal name called "ISO 15444", compared with JPEG, it has a higher compression rate and moreNew generation of static image compression technology. JPEG2000 is an upgraded version of JPEG with a compression ratio of about 30% higher than JPEG. Unlike JPEG, JPEG2000 supports both lossy and lossless compression, while JPEG only supports lossy compression. Lossless compression is useful for preserving some important images. One of the most important features of JPEG2000 is its ability to achieve progressive transmission, which is similar to GIF's "fade", that is, to transfer the contour of the image, and then gradually transfer the data, continuously improve the image quality, so that the images from hazy to clear display, and not necessarily like the current JPEG, Show slowly from top to bottom.   TIFF Format   TIFF (TAG Image File format) is widely used in Mac image format, it is characterized by complex image format, more storage information. Because it stores the image of a small level of information very much, the quality of the image can be improved, so it is very beneficial to the copy of the manuscript. The format has two forms of compression and non-compression. However, because the TIFF format structure is more complex, the compatibility is poor.   PSD format   This is the famous Adobe company image processing software for Photoshop's dedicated format Photoshop Document (PSD). PSD is actually a graphic design of Photoshop "Draft map", which contains a variety of layers, channels, masks and other design of the sample, so that the next time you open the file can modify the previous design.   Eight, PNG format   PNG (Portable Network Graphics) is a new type of Web image format. Unysis Company announced that GIF has a patented compression method, requiring the author of the development of GIF software to pay a certain fee, resulting in the creation of a free PNG image format. PNG is currently guaranteed the most undistorted format, it draws the advantages of both GIF and JPG, the storage form is rich, both GIF and JPG color mode, another feature of the image files can be compressed to the limit to facilitate the network transmission, but also to retain all the image quality-related information, Because PNG uses lossless compression to reduce the size of the file, which is different from a JPG that sacrifices image quality in exchange for a high compression rate, the third feature is that the display is fast enough to display a low-resolution preview image with only 1/64 of the image information downloaded; PNG also supports the production of transparent images. The disadvantage of my PNG is that it does not support animation application effects.   Nine, SWF format   using Flash we can create a suffix named swf (Shockwave format) animation, this format of animated images can be used relatively small volume to express rich multimedia form. InIn the aspect of image transmission, it is not necessary to wait for all the files to be downloaded to watch, but to download and look at it, so it is especially suitable for network transmission.   10, SVG format   SVG (Scalable Vector graphics), which means a scalable vector graphic. It is based on XML (extensible Markup Language), developed by the World Wide Web Consortium Consortium. Strictly speaking, it should be an open-standard vector graphics language that allows you to design exciting, high-resolution web graphics pages. The user can use the code to depict the image directly. (There are also compatibility issues in browsers such as UC).   Other non-mainstream image formats: 1, PCX format   PCX format is a format developed by ZSoft company in developing image processing software paintbrush, which is a compressed format that consumes less disk space. Because the format appears longer, and has the ability to compress and full color, it is still more popular now. 2. dxf format   DXF (Autodesk Drawing Exchange format) is a vector file format in AutoCAD that stores files in ASCII mode and is accurate in terms of the size of the graphics. Many software supports both input and output in DXF format. 3. wmf format   WMF (Windows Metafile format) is one of the common metafile formats in Windows, which is a vector file format. It has a short file, pattern modeling features, the entire graph is often composed of individual components, the graphics are often rough. 4. emf format   EMF (Enhanced Metafile) is a Windows 32-bit extended metafile format developed by Microsoft in order to compensate for the shortcomings of the use of WMF, and is also part of the vector file format, which is intended to make the metafile easier to accept 5, The LIC (FLI/FLC) format   flic format was developed by Autodesk and Flic is the collectively known as FLC and FLI: FLI is the original 320x200 resolution based animation file format, and FLC uses more efficient data compression technology, Therefore, it has a higher compression ratio than the FLI, and its resolution has improved a lot. 6, EPS format   EPS (encapsulated PostScript) is a relatively rare form of PC users, while Apple Mac machine users are used more. It is an ASCII code file format described in PostScript language, which is mainly used for output work such as typesetting and printing. 7. TGA format   TGA(Tagged graphics) file is an image file format developed by the United States Truevision Corporation for its display card, which has been accepted by the international graphics and image industry. The structure of TGA is relatively simple, belonging to a general format of graphics and image data, which has a great influence on the multimedia field, and is a preferred format for computer-generated image conversion to TV.

Common picture formats