Image file image folder, image file is an extreme machine disk file that depicts an image, and its file formats are no less than dozens. Image files can be divided into two categories, namely picture files and animation files.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
Image is an image folder. The image file is an extreme machine disk file that depicts an image. There are no fewer than dozens of file formats. Image files can be divided into two categories, namely picture files and animation files.
IMG format is commonly used in Digital Research applications. The img format is a type of image. You can install IMG data files by making a data CD or using a virtual CD-ROM drive (such as WinMount).
The img format is a format for image files. It has high compression efficiency. The IMG format supports images of any size. img image file format, the image data is stored in a similar two-dimensional array format. The first two positions in the first line store the width of the image, the next two positions store the height of the image, the next position stores the gray level of the image, and all the remaining positions store are all grayscale of the image.
Extended information:
Common image file formats:
1.BMP: The BMP format is Microsoft The biggest advantage of the graphics standard formulated by the company is that it has first-class compatibility on PC and can be "accepted" by almost all graphics software. It can be called a universal format. Even if you don't install any graphics viewing software, you can still use Windows' "paint brush" look. Its structure is simple and uncompressed. Graphics stored in bmp format will not be distorted, but the file is relatively large and does not support Alpha (transparent background) channel.
2. JPG: JPG format is the most popular graphics format on the Internet. It can compress the file size to the smallest format. JPG supports different levels of compression ratios. You can adjust the compression ratio as appropriate. The greater the compression ratio, the lower the quality; conversely, the smaller the compression ratio, the better the quality. However, one thing to note is that this compression method is a distortion-type compression, and the compression of files will reduce the graphics quality.
JPEG (Joint Photographic Experts Group) is an image expert group jointly formed by CCITT (Consultative Committee on International Telegraph and Telephone) and ISO (International Organization for Standardization).
3. GIF: GIF, like JPG, is the most common graphics format on the Internet. Its disadvantage is that it only supports 256 colors and the file capacity is much larger than JPG. However, it has unique skills, it can use transparent colors, and it can combine several pictures to make animation files. This format is only used by friends who make web pages.
The above is the detailed content of What is an image file. For more information, please follow other related articles on the PHP Chinese website!