如何通过cimg获得rgb值？

#include <iostream>
#include "CImg.h"

using namespace cimg_library;

int main() {
    // 加载图像
    CImg<unsigned char> image("image.jpg");

    // 获取图像的宽度和高度
    int width = image.width();
    int height = image.height();

    // 获取指定像素位置的RGB值
    int x = 100;
    int y = 200;
    unsigned char r = image(x, y, 0);
    unsigned char g = image(x, y, 1);
    unsigned char b = image(x, y, 2);

    // 输出RGB值
    std::cout << "RGB values at (" << x << ", " << y << "):" << std::endl;
    std::cout << "Red: " << (int)r << std::endl;
    std::cout << "Green: " << (int)g << std::endl;
    std::cout << "Blue: " << (int)b << std::endl;

    return 0;
}