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How to convert a PPM image to grayscale in C++

... operator <<(std::ofstream& outputStream, const PPMImage& img); void grayscale(); // feel free to add more if you want! private: string magicNumber; // A "magic number" for identifying the file type int width; // Width of the image int height; // Height of the image int maxColorVal; // Maximum color value char *threeChan; // A series of rows and columns (raster) that stores important binary image data }; string magicNumber - For simplicity of this guide, we'll let this be "P6".