各种图像处理的源代码，将全彩色图片变为256色彩色图像 可以将彩色图像变成灰度图像，可以对图像图像进行直方图的绘制等！-A variety of image processing source code, will be 256 full-color picture into a color image can be color images into grayscale images, you can image image histogram drawing!