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       INT32 new_width 
       INT32 new_height

    Gimp->gimp_image_scale($img, $new_width, $new_height);

    Gimp->gimp_image_scale($img, $new_width, $new_height);
    Gimp->image_scale($img, $new_width, $new_height);
    $img->scale($new_width, $new_height);