Saving an image in OpenCV

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If you use C++, it is best to use C++ interface:

using namespace cv;
// Capture the Image from the webcam
VideoCapture cap(0);

// Get the frame
Mat save_img; cap >> save_img;

if(save_img.empty())
{
  std::cerr << "Something is wrong with the webcam, could not get frame." << std::endl;
}
// Save the frame into a file
imwrite("test.jpg", save_img); // A JPG FILE IS BEING SAVED

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