实现bmp图像到YUV444、YUV422、YUV420等格式的转换，有助于理解BMP和YUV格式的含义,Bmp image to achieve YUV444, YUV422, YUV420, such as format conversion, BMP and contribute to an understanding of the meaning of YUV formats

RGB与YUV互相转化的程序，非常实用！-RGB and YUV conversion process to each other, very practical!