Computer wallpaper pictures of each one can be beautiful expression of personal sentiment and style; when we design web pages, images are ultimately decorated. Then the usual image we have come across it in the end what? Common image file formats And what then?
1, BMP format
BMP is the English Bitmap (bitmap) in short, it is a standard Windows operating system image file format, can be supported by many Windows applications. With the Windows operating system popular with rich Windows application development, BMP bitmap format is widely used naturally. This format is characterized by rich image information contained almost no compression, but this led to all born with health defects - take up too much disk space. So, now more popular BMP in a single machine.
Second, GIF format
GIF is the English Graphics Interchange Format (Graphics Interchange Format) abbreviation. As the name suggests, this format is used to exchange pictures. It is true that the last century 80's, a leading U.S. online information service CompuServe network bandwidth for time constraints, to develop such a GIF image formats.
GIF format is characterized by high compression ratio, the disk space occupied by small, so this image format widely used promptly. The original GIF is simply used to store single frame still images (called GIF87a), then as technology development, and can also store a number of pieces of still image and then form a continuous animation, making it one of the few who supported 2D animation formats (known as GIF89a), while the image in GIF89a transparent area can be designated to display images with extraordinary results, this enables full GIF scenery. The current Internet, a large number of documents used in multi-color animation for this format, also known as GIF89a format.
In addition, taking into account the actual situation of the network transmission, GIF image format also means increased starting to prove, that is, the image transfer process, the user can first see the general outline of the image, and then continued with the gradual transfer process Some see the details of the image to adapt to the user "from the obscure to the clear" viewing psychology. The current Internet, a large number of documents used in multi-color animation for this format.
However, GIF has a small drawback, that can not store more than 256 color images. However, this format is still popular network applications, and GIF image files that short, download speed, available in many image files with the same size composition of animation and other advantages are inseparable.
3, JPEG format
JPEG is a common image format, which consists of the Joint Photo Expert Group (Joint Photographic Experts Group) to develop and to name "ISO 10918-1", JPEG is a commonly known simply nothing. JPEG file extension. Jpg or. Jpeg, its compression technology is very advanced, it is redundant with the lossy compression method and color image data, to obtain very high compression ratio can also display a very rich and vibrant images In other words, is the minimum disk space can get better image quality.
JPEG is also a very flexible format, with the image quality adjustment function, allowing you to use a different compression ratio on this file compression, such as the maximum we can 1.37MB of BMP bitmap file compressed to 20.3KB. Of course, we can in the image quality and file size to find a balance between.
As the JPEG quality and excellent outstanding performance, it is also widely used, especially in the Internet and CD-ROM books, the positive can be found in its shadow. Currently all browsers support the JPEG image format such as JPEG format, smaller file size, download speed, makes the Web page may provide a shorter download time, a large number of beautiful images, JPEG while also naturally become the network's most popular image formats.
4, JPEG2000 format
JPEG JPEG 2000 is the same organization responsible for developing, and it has an official name called "ISO 15444", compared with JPEG, it has a higher compression ratio and more new features of the new generation still image compression technology.
JPEG JPEG2000 as an upgraded version of the JPEG compression ratio higher than about 30%. The difference is that with JPEG, JPEG2000 supports both lossy and lossless compression, while JPEG only supports lossy compression. Lossless compression for the conservation of some important image is very useful. JPEG2000's a very important feature is that it can achieve progressive transmission, that with the GIF's "starting to prove" there is meditation, which is to transfer the outline of the image, and then gradually transfer the data to continuously improve image quality, so that images clear from the twilight to show, but not necessarily the same as the current JPEG, shown from top to bottom slowly.
In addition, JPEG2000 also supports the so-called "region of interest" feature, you can specify the image you are interested in any area of the compression quality can also choose to specify some of the first extract. JPEG JPEG 2000 and compared with obvious advantages and backward compatible, so just around the corner to replace the conventional JPEG format.
JPEG JPEG2000 can be used in traditional markets such as scanners, digital cameras, can also be applied to new areas, such as network transmission, wireless communications.
5, TIFF format
TIFF (Tag Image File Format) is a Mac image format widely used, it is jointly developed by the Aldus and Microsoft, was initially scanned images for cross-platform storage needs of design. It is characterized by complex image formats, store information and more. Because it stores the image information is more subtle level, image quality is also improved, Guer very beneficial to the manuscript copy.
The format of compressed and uncompressed two forms, which can be used LZW lossless compression program storage. However, TIFF format structure is more complex, less compatibility, so your software sometimes may not correctly identify the TIFF file (now most of the software have solved this problem.) Present in Mac and PC, transplant TIFF files are very convenient, so TIFF is now the most widely used computer image file formats.
6, PSD format
This is the famous Adobe's Photoshop image processing software dedicated format Photoshop Document (PSD). PSD is Photoshop for graphic design of a "draft plan", it contains the various layers, channels, masks and other design comp for the next time you open a file can modify the design of the previous . Photoshop supported in a variety of image formats, PSD access speeds much faster than other formats, and powerful function. As more and more widely used Photoshop, so we have reason to believe that this format will gradually catch on.
7, PNG format
PNG (Portable Network Graphics) is a new network image format. In the end of 1994, as Unysis announced GIF patented compression method, which requires the development of GIF software required to pay a fee, The resulting free png image format was born. PNG a combination of GIF and JPG beginning two long, intended to replace the two formats in one fell swoop. October 1, 1996 by the PNG to the international network of alliances and received the recommendation approved standard, and most of the mapping software and browsers start supporting PNG image browsing, life glow from PNG image format.
PNG is to ensure the most undistorted form, it draws on the advantages of both GIF and JPG, storage form of wealth, both GIF and JPG color mode; its other features can compress image files to the limit in order to facilitate network transmission, but can retain all information related with the image quality, since PNG is lossless compression to reduce file size, image quality and sacrifice it in exchange for high JPG compression ratio is different; its third characteristic is to show very fast, simply download the 1 / 64 of the image information can show low-resolution preview images; fourth, PNG transparent images also support the production of transparent image when the image in the production of useful pages, we Set the background image can be transparent, with the page itself instead of the color information set transparent color, this will allow the background image and page are in harmony together.
The disadvantage is that PNG does not support animation application effect, if can be strengthened in this regard simply can completely replace the GIF and JPEG up. Macromedia's Fireworks software, the default format is PNG. Now, more and more software began to support this format, but the network also increasingly popular cut-off.
8, SWF format
Using Flash we can create a kind of suffix, called SWF (Shockwave Format) of animation, animated images in this format can be used to represent a relatively small volume of rich multimedia form. In image transmission, without waiting for files to download to view all, but you can look side to download, so particularly suitable for network transmission, especially in the case of poor transfer rate can also get good results. Also proved this point, SWF now has been used in WEB pages for multimedia presentations and interactive design. In addition, SWF animation is making its vector technology, so no matter how many times the picture to enlarge the picture will not be any damage. In summary, SWF format works for its high-definition picture quality and compact size, are more and more web designers, are becoming more and more animation and Web page design mainstream picture, has become the Internet de facto standard for animation.
9, SVG format
SVG can be considered to be the far the most fiery of the image file format, and it's the English full name Scalable Vector Graphics, meaning scalable vector graphics. It is based on XML (Extensible Markup Language), the World Wide Web Consortium (W3C) developed by the coalition. Strictly speaking, should be an open standard vector graphics language that allows you to design exciting, high-resolution Web graphics page. Users can use the code to describe the image, you can use any text-processing tools to open SVG image, by changing some code to make images with interactive features, and can be readily inserted into the HTML of your browser to view.
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