opencv 像素数据取反

#include<opencv2\opencv.hpp>
#include<highgui.h>

using namespace cv;


int main(int argc, char** argv)
{

    Mat in_img = imread("D:/vcprojects/images/123.jpg");

    Mat out_img;
    in_img.copyTo(out_img);

    int channels = in_img.channels();
    int rows = in_img.rows;
    int cols = in_img.cols * channels;
    if (in_img.isContinuous()) {
        cols *= rows;
        rows = 1;
    }

    uchar* p1;
    uchar* p2;
    for (int row = 0; row < rows; row++) {
        p1 = in_img.ptr<uchar>(row);    // 获取像素指针
        p2 = out_img.ptr<uchar>(row);
        for (int col = 0; col < cols; col++) {
            *p2 = 255 - *p1; // 取反
            p2++;
            p1++;
        }
    }

    imshow("in_img", in_img);
    imshow("out_img", out_img);

    waitKey(0);
    
    return 0;
}