OpenCV中保存与读取4通道图像（bmp）Opencv没有提供四通道图像保存方法只提供了保存为（XML等其它格式的文件） 该源码提供了该方法-in the Opencv not have the method that save or read the 4 channel picture. Opencv just can save or read the 4 channel image to XML or other format u