完成pic到tif图像格式的转换,并且完成了读写pic,tif图像文件的源代码。挖图菜单完成在原始图中获取任意位置和大小的图像。-Complete the pic to tif image format conversion, and the completion of the reading and writing pic, tif image files of the source code. Digging in the original plan to complete the menu