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What's wrong with scaling?

Hello.

I'm trying to scale an image into 4x4 pixels by this code:

    Mat image4x4;

    vector<int> compression_params;
    compression_params.push_back(CV_IMWRITE_PNG_COMPRESSION);
    compression_params.push_back(9);

    resize(imageFromFile, image4x4, Size(4,4), INTER_CUBIC);
    imwrite("/Users/macuser/Desktop/4x4/"+names.at(i), image4x4, compression_params);

The result is this:

image description

but if I do it with GIMP (in 'cubic' as well), the result is:

image description

I don't know what factor I'm not considering when scaling... do you have any clue?

Thank you very much. Regards.