MATLAB中多种彩色图像转为灰度图像的策略

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 imgname='E:\1.bmp';  
    
 [imagRGB]     = imread( imgname );  %定义图像名称为imagRGB  
    
 subplot(2,2,1);
    
 imshow([imagRGB]);
    
 title('原始图像');
    
   
    
 if (length(size(imagRGB)) > 2)       %判断通道  
    
     imagGray = rgb2gray(imagRGB);  
    
 else  
    
     imagGray = imagRGB;  
    
 end  
    
 %clear('imagRGB');  
    
 data =  double(imagGray);  
    
 data =flipdim(data,1);    
    
    % Flip linear dimensions (image coordinate system starts at upper left