void brightnesschange()
{
	char fname[MAX_PATH];
	int offset = 50;
	while (openFileDlg(fname))
	{
		Mat src = imread(fname, CV_LOAD_IMAGE_GRAYSCALE);
		Mat aux = src.clone(); //scalar(255) - background alb
		int vec[256];
		int gout;

		for (int i = 0; i < src.rows; i++)
		{
			for (int j = 0; j < src.cols; j++)
			{

				src.at<uchar>(i, j) + 50;

			}
		}
	}
}