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// remove-color.cpp 
// @mango

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



int main()
{
	cv::Mat img = cv::imread("fruit.jpg");
	if (img.empty())
	{
		std::cout << "Failed to read the  image!" << std::endl;
		return -1;
	}

	for (size_t i = 0; i < img.rows; i++)
	{
		for (size_t j = 0; j < img.cols; j++)
		{
			int max = std::max(
				std::max(img.at<cv::Vec3b>(i, j)[0], img.at<cv::Vec3b>(i, j)[1]),
				img.at<cv::Vec3b>(i, j)[2]
			);

			int min = std::min(
				std::min(img.at<cv::Vec3b>(i, j)[0], img.at<cv::Vec3b>(i, j)[1]),
				img.at<cv::Vec3b>(i, j)[2]
			);

			for (size_t k = 0; k < 3; k++)
			{
				img.at<cv::Vec3b>(i, j)[k] = (max + min) / 2;
			}
			
		}
	}

	cv::imshow("去色滤镜", img);
	cv::waitKey(0);

	return 0;
}