사용한 라이브러리

Q.24. 감마 보정

int main()
{
    PPM ppm("imori_gamma.pnm");
    int width = ppm.Get_width();
    int height = ppm.Get_height();
    double c = 1., g = 2.2;

    auto carib = [&](double v)
    {
        return pow(v / c, 1. / g);
    };

    PPM ppm2(width, height);
    for(int j=0; j<height; j++)
        for (int i = 0; i < width; i++)
        {
            ppm2(i,j,'r') = carib(ppm(i,j,'r')/255.)*255;
            ppm2(i, j, 'g') = carib(ppm(i, j, 'g')/255.)*255;
            ppm2(i, j, 'b') = carib(ppm(i, j, 'b')/255.)*255;
        }
    ppm2.Flush("out.ppm");
    return 0;
}