用windows画笔生成BMP文件f(x,y),图象宽为W，高为H，编写程序读取BMP文件，并生成新的图象g(x,y)。以BMP文件格式输出该图象。-Windows paintbrush used to generate BMP file f (x, y), image width W, height H, the preparation process to read BMP files, and generate new images g (x, y). BMP file format to