打开一幅BMP图像，能够将灰度图像转化为彩色图像，能够将彩色图像转化为灰度图像，并且实现图像的水印效果，实现对处理后的图像进行保存。-Open a BMP image, the gray-scale image can be converted into a color image to the color image into a grayscale image, and the watermark image to save the processed image.