盘点图形图像文件扩展名（Check the graphic image file extension）Check the graphic image file extension2005-03-01 Author: Source: Click: 468Check the graphic image file extensionGraphic image files can be roughly divided into two broad categories: one is bitmap files, and the other is called description classes, vector classes or object oriented graphic image files. The former describes graphic images in the form of lattices, and the latter is a graphical image of geometric elements described in mathematical terms. Generally speaking, the latter is meticulous and true to the image representation, and the resolution of the zoomed image is invariable. It is used more in the graphic processing of the professional level.1, bitmap graphics file*.bmp (Bitmap)*.bmp is the standard image file format in Windows, and has become the De De industrial standard in PC Windows system. There are two forms of compression and no compression. It describes the bitmap from the device independent, and can store the image data in uncompressed format. The decoding speed is fast, and it supports the storage of multiple images. The common P C graphics software can process it. In PhotoShop, BMP images can be rendered up to 16M colors at most.*.dib (Device, Independent, Bitmap)*.dib is a graphics file format similar to *.bmp. The ability to describe images is basically the same as that of *.bmp, and can run on a variety of hardware platforms, but larger files. A variety of common P, C graphics, image software can handle it.*.gif (Graphics, Interchange, Format)*.gif is a compressed graphics file format that can be processed on a variety of graphics processing software on various platforms. It is a standard bitmap format for porting between Macintosh, Amiga, Atati, and IBM machines. The format was created by Compuserver, which stores only 256 colors. In color, depth, and image size, *.gif is similar to *.pcx; in structure, *.gif is similar to *.tiff. Because it is compressed image file format, so mostly used in network transmission, speed than the transmission of other image file format much faster. The biggest drawback is that it can only have a maximum of 256 colors, it can not be used for storing image files of true color, but the GIF89a format can be stored into the background transparent form, and can be a number of survival into a document, thus forming animation.*.png (Portable, Network, Graphics)*.png is a bitmap file format that can store 32 bits of information, and its image quality is much better than *.gif. Like *.gif, *.png also uses lossless compression to reduce file size. When compressing bitmap data, it uses a variant of the well received L z77 algorithm. At present, more and more software begin to support this format, in the near future, it may be popular on the whole Web. *.png images can be grayscale (16 bit) or color (48 bit), or 8 bit index color. The *.png image uses a high-speed alternate display scheme, which displays very fast and needs to download the 1/64 image information to display a low resolution preview image. Unlike *.Gif, the *.png image format does not support animation.*.rle (Run, Length, Compressed)*.rle is a compressed bitmap file format. RLE compression scheme is a very mature compression scheme, characterized by lossless compression (Lossless), which saves disk space without losing any image data. But there are advantages and disadvantages. It takes more time to open this compressed file. In addition, some applications with poor compatibility may not be able to open the *.Rle file.*.tif/*.tiff (Tag, Image, File, Format)*.tiff is a graphics file format developed by Aldus for Macintosh, which was first popular in Macintosh, and now supported by mainstream image applications on Windows. At present, it is the most widely used bitmap format M acintosh and PC, in these two kinds of hardware platform and transplant *.tiff graphics is very convenient, most scanners can output *.tiff format image files. The format supports a maximum number of colors up to 1 6M. Its characteristics are: high quality image storage, but the storage space is very large, its size is 3 times 10 times the corresponding *.gif image, *.jpeg image; subtle level information is more conducive to the original tone and color reproduction. The format has two forms of compression and non compression, in which the compression form uses the L ZW (Lempel-Ziv-Welch) lossless compression scheme. In PhotoShop, the *.tiff format supports 24 channels, except for the PhotoShop itself format (i.e., *.psd and *PDD) the only file format that can store multiple four channels. The only disadvantage is that it is very difficult to decompress *.tiff files because of the unique variable structure of *.Tiff. *.tiff format has now been developed to version 6 and is jointly owned by Aldus and Microsoft, but its format is free to use. Also, in 3 DS, you can also generate files in *.tiff format. The *.tif