사용한 라이브러리

Q.2. 그레이스케일화

int main()
{
    PPM ppm("imori.pnm");
    int width = ppm.Get_width();
    int height = ppm.Get_height();
    PPM ppm2(width, height);

    for(int j=0; j<height; j++)
        for (int i = 0; i < width; i++)
        {
            int r = ppm(i, j, 'r');
            int g = ppm(i, j, 'g');
            int b = ppm(i, j, 'b');
            int y = (std::round)(0.2126 * r + 0.7152 * g + 0.0722 * b);
            ppm2(i, j, 'r') = y;
            ppm2(i, j, 'g') = y;
            ppm2(i, j, 'b') = y;
        }

    ppm2.Flush("out.ppm");
    return 0;
}