把Picture中的图片保存为Gif格式 把bmp文件保存为gif文件，没有使用任何Dll，完全使用VB实现。在压缩比上还有所欠缺，算法有待改进。-put the photographs to preserve Gif formats bmp file documents to gif, Dll not use any fully use VB. The compression ratio, which had been lacking, the algorithm needs improv