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Mat inImg = imread("Penguins.jpg",0); //Data point copy unsigned char * pData = inImg.data; int width = inImg.rows; int height = inImg.cols; //gray color value reverse for(int i=0; i < width; ++i) { for(int j=0; j < height; ++j) { pData[j*width+i] = 255-pData[j*width+i]; } } //create another Mat same size, type with inImg Mat outImg(width, height, CV_8UC1); //data copy using memcpy function memcpy(outImg.data, pData, sizeof(unsigned char)*width*height); //processing and copy check namedWindow("Test"); imshow("Test", inImg); namedWindow("Test2"); imshow("Test2", outImg); cvWaitKey(0);-----
Thank you.