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// vintage-filter.cpp : 怀旧滤镜
// @mango

#include <iostream>
#include<opencv2/opencv.hpp>



int main()
{

	cv::Mat img = cv::imread("fruit.jpg");

	for (size_t i = 0; i < img.rows; i++)
	{
		for (size_t j = 0; j < img.cols; j++)
		{
			
			img.at<cv::Vec3b>(i, j)[1] = cv::saturate_cast<uchar>(0.349*img.at<cv::Vec3b>(i, j)[2] + 0.686*img.at<cv::Vec3b>(i, j)[1] + 0.168*img.at<cv::Vec3b>(i, j)[0]);// green
			img.at<cv::Vec3b>(i, j)[2] = cv::saturate_cast<uchar>(0.393*img.at<cv::Vec3b>(i, j)[2] + 0.769*img.at<cv::Vec3b>(i, j)[1] + 0.189*img.at<cv::Vec3b>(i, j)[0]);// red
                        img.at<cv::Vec3b>(i, j)[0] = cv::saturate_cast<uchar>(0.272*img.at<cv::Vec3b>(i, j)[2] + 0.534*img.at<cv::Vec3b>(i, j)[1] + 0.131*img.at<cv::Vec3b>(i, j)[0]);// blue
		}
	}
	cv::imshow("怀旧滤镜", img);

	cv::waitKey(0);
	return 0;
}