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// single-color-filter.cpp 
// @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++)
		{
			// 保留绿色 | remain green
			img.at<cv::Vec3b>(i, j)[0] = 0;// blue
			img.at<cv::Vec3b>(i, j)[2] = 0;// red
		}
	}
	cv::imshow("单色滤镜-绿色", img);

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