中文说明：用imread( )函数读取一幅bmp图像，用imwrite()函数将最初读入的bmp图象另存为一幅jpg图像,设为3.jpg，用imfinfo()分别获取图像文件的信息，等一些简单图像处理操作
English Description：
With the imread () function to read a BMP image, using imwrite () functionBMP images will initially read save as a JPG image, is set to 3.jpg, using imfinfo () respectively to obtain the image file information, some simpleimage processing operations