当处理图形文件(例如jpeg图像)时，压缩就不那么好用了，因为数据更加难于减少重复。
When working with a graphic file, such as a JPEG image, the compression doesn't work as well because the data is more difficult to de-duplicate.
利用 GD 和 Perl 的力量，您可以把各种数据和图像链接到一起来创建有助于提升应用程序视觉兴趣的复杂图形。
Using the power of GD and Perl, you can link various data and images together to create sophisticated charts that will help bring visual interest to your applications.
如果从图形卡中读取图像数据仅仅是为了在另一个进程中把这些数据复制回图形卡中，使用加速的渲染通常首先就是不值得的。
If the images needs to be read off the video card only to be copied back to the video card in another process, it is usually not worthwhile using accelerated rendering in the first place.
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