（利用GIF_LZW算法实现的）网络图片传输

一、使用TCP协议传输数据。理由：稳定性好。

二、使用字节数据流进行传输，理由：

A:VB的String存在自动Unicode转换问题，影响速度；

B:可以直接发送8位字节数据，不需要使用Base64编码，从而减少了编码时间。

三、使用GIF-LZW压缩算法压缩图像。理由：

A:行程编码、Huffman压缩算法压缩率太低；

B:JPEG压缩算法需要太多位运算，且运算量大（有专门MMX优化算法），不利于VB实现；

C:GIF-LZW压缩算法压缩率较好，且我已想出VB语法下高效GIF-LZW压缩/解压算法。

四、使用“有序抖动”算法进行 色彩量化。理由：“有序抖动”处理的结果具有一定规律性，有助于LZW类算法压缩。-(Using GIF_LZW algorithm) network picture transmission one, use the TCP protocol to transfer data. Reasons: good stability. Second, the use of byte data stream for transmission reasons: A: VB' s String automatic Unicode conversion problem exists, impact speed　B: You can directly send 8 bytes of data, do not need to use Base64 encoding, thereby reducing the encoding time. Third, the use of GIF-LZW compression algorithm to compress the image. Rationale: A: run-length encoding, Huffman compression algorithm compression rate is too low : JPEG compression algorithm requires too many bit operations, and the large amount of computation (specifically MMX optimization algorithm), and not conducive to the realization of VB　C: GIF-LZW compression algorithm The compression ratio is better, and I have come up with the VB syntax efficient GIF-LZW compression/decompression algorithm. Ordered dithering algorithm for color quantization. The reason: " ordered dithering"　the results of trea