opencv 4通道转换成三通道

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opencv 从Mat的4通道转换成IplImage的三通道
 
cv::Mat img0=QImage2cvMat(showImage);
IplImage* pSrc =NULL;
 
 
 IplImage img = img0;
 
 
        IplImage *img3chan = cvCreateImage(cvGetSize(&img),img.depth, 3);
        cvCvtColor(&img,img3chan,CV_RGBA2RGB);//CV_RGBA2RGB表示4通道转成3通道
       pSrc=img3chan;

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