里面包含几种常见的图像格式及其特点，（如：PCX，TIFF，BMP格式等等），以及几种主要格式存储图像质量和所占空间，另外还介绍了几种格式所适用的领域和场所-Which contains several common image format and its characteristics, (such as: PCX, TIFF, BMP format, etc.), as well as several major format image quality and storage space