usa

#include <iostream>
#include <cv.h>
#include <highgui.h>
using namespace std;
using namespace cv;
int main()
{
    Mat image1;
    image1 = imread("Lenna.png");
    int i, j;
    Mat imgOut(image1.rows, image1.cols, CV_8UC1, Scalar(0, 0, 0));
    Mat imgOutNew(image1.rows, image1.cols, CV_8UC1, Scalar(0, 0, 0));

    for(int i=0; i<image1.rows; i++){
        for(int j=0; j<image1.cols; j++){
            //membaca setiap piksel
            Vec3b intensity = image1.at<Vec3b>(i, j);
            uchar blue = intensity.val[0];
            uchar green = intensity.val[1];
            uchar red = intensity.val[2];

            //mengubah RGB menjadi grayscale
            uchar imGray = (red * 0.299 + green * 0.587 + blue * 0.114);
            imgOut.at<uchar>(i, j) = imGray;

            if(imgOut.at<uchar>(i,j)>100)
                imgOutNew.at<uchar>(i,j)=100;
            else
                imgOutNew.at<uchar>(i,j)= imgOut.at<uchar>(i,j);
        }
    }
    imshow("tresh_binary_manual.jpg",imgOutNew);
    cvWaitKey(0);
return 0;
}