一、引言使用图像文件之前，常常需要通盘地测览一下所有的图像文件，以便从中选择最适合需要的。例如当有许多背景图像的时候，要为网页选择一幅背景，往往需要反复权衡比较，最后才能决定哪一幅比较满意。通过资源管理器—一打开图像文件当然可以，但是这样太繁琐，而且不能 I. INTRODUCTION Before using image files, it is often necessary to have a quick overview of all image files in order to choose the one that best suits your needs. For example, when there are many background images, selecting a background for the web page often requires repeated trade-offs and comparison to determine which one is more satisfactory. Of course, through the Explorer - an open image file, but it is too cumbersome, and can not