有详细解释非常易懂的图像读写程序，读入指定BMP文件进内存输出图像的信息改变灰度图像的颜色表蓝色分量的值,察看前后变化将图像数据存盘-Explained in detail the image reading and writing process is very easy to understand, read the specified BMP file into memory, the image information output gray scale image to change