说明：  通过阅读这份文档,能够对 JPEG 图形压缩有一定感性的认识, 但其数学原理不需要搞清. 能够通过这, 开始写自己的编码/解码程序. 或者看懂以有的代码. 对有损图形压缩有进一步了解.自己能够改良 JPEG, 比如增加透明色的支持, 加快 JPEG 的解码速度.
(By reading this document to JPEG image compression to a certain emotional understanding, it does not need to understand the mathematical principles. through this, begin to write their own encoding/decoding process. or to read some code. graphics compression harmful to the further understanding. own JPEG can be improved, such as increasing transparency color support and accelerate the speed JPEG decoders.)