message: Fixed small inefficiency in seamless clone init
diff: @@ -57,12 +57,8 @@ void Cloning::computeGradientX( const Mat &img, Mat &gx)
  }
  else if (img.channels() == 1)
  {
  - Mat tmp[3];
  - for(int chan = 0 ; chan < 3 ; ++chan)
  - {
  - filter2D(img, tmp[chan], CV_32F, kernel);
  - }
  - merge(tmp, 3, gx);
  + filter2D(img, gx, CV_32F, kernel);
  + cvtColor(gx, gx, COLOR_GRAY2BGR);
  }
  }
  @@ -78,12 +74,8 @@ void Cloning::computeGradientY( const Mat &img, Mat &gy)
  }
  else if (img.channels() == 1)
  {
  - Mat tmp[3];
  - for(int chan = 0 ; chan < 3 ; ++chan)
  - {
  - filter2D(img, tmp[chan], CV_32F, kernel);
  - }
  - merge(tmp, 3, gy);
  + filter2D(img, gy, CV_32F, kernel);
  + cvtColor(gy, gy, COLOR_GRAY2BGR);
  }
  }
  