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// copy src image content to dst image for (int j = 0; j < src->height; j++) { uchar* pSrc = (uchar*) (src->imageData + j * src->widthStep); uchar* pDst = (uchar*) (dst->imageData + j * dst->widthStep); for (int k = 0; k < src->width; k++) { for (int i = 0; i < 3; ++i) { pDst [3 * k + i] = pSrc [3 * k + i]; } } }