彩色图的处理，主要是像素数据不同。由于每行数据的字节数必须是4的整数倍，这个地方处理起来要比灰度图麻烦很多，多以暂时还 没做好。本程序的局限性就是只能处理尺寸是4的整数倍的图片，可以旋转任意角度(逆时针)-Processing color image, mainly different pixel data. Since the number of bytes of data in each row must be an integer multiple of 4, the grayscale place to deal with them than a lot of trouble, and many more being not good. Limitations of this program is to only deal size is an integer multiple of 4 images can be rotated at any angle (counterclockwise)