Image Image :: increasecontrast ()
{
	int min_value=255;
	int max_value=0;

	for (int i=0 ; i < height ; i++)

		for (int j=0 ; j < width ; j++)
		{

			if (image [i][j] < min_value)
				min_value = image[i][j];
			else
				min_value=min_value
			if (image [i][j]> max_value)
				max_value =image [i][j];
			else
				max_value = max_value
		}

		double m = 255.0 / (max_value - min_value);
		double c= -m * min_value;