Experiment with Hue, Saturation and Value of image

HVSTest.cpp

//Global variables
Mat src, img, image;

//int elem1 = 255;
int elem2 = 234;
int elem3 = 187;

/** @function main */
int main(int argc, char** argv)
{
	/// Load an image
	namedWindow("image");

	//createTrackbar("Huse", "image", &elem1, max_elem, Hue);
	//createTrackbar("Saturation", "image", &elem2, max_elem, Saturation);
	//createTrackbar("Value", "image", &elem3, max_elem, Value);

	src = imread("road.jpg");
	cvtColor(src, img, CV_RGB2HSV);

	//int hue = elem1 - 255;
	int saturation = elem2 - 255;
	int value = elem3 - 255;

	for (int y = 0; y<img.cols; y++)
	{
		for (int x = 0; x<img.rows; x++)
		{
			//int cur1 = img.at<Vec3b>(Point(y, x))[0];
			int cur2 = img.at<Vec3b>(Point(y, x))[1];
			int cur3 = img.at<Vec3b>(Point(y, x))[2];
			//cur1 += hue;
			cur2 += saturation;
			cur3 += value;

			//if (cur1 < 0) cur1 = 0; else if (cur1 > 255) cur1 = 255;
			if (cur2 < 0) cur2 = 0; else if (cur2 > 255) cur2 = 255;
			if (cur3 < 0) cur3 = 0; else if (cur3 > 255) cur3 = 255;

			//img.at<Vec3b>(Point(y, x))[0] = cur1;
			img.at<Vec3b>(Point(y, x))[1] = cur2;
			img.at<Vec3b>(Point(y, x))[2] = cur3;
		}
	}

	cvtColor(img, image, CV_HSV2RGB);
	imshow("image", image);
	
	waitKey(0);
	return 0;
}