$image = new Gumlet\ImageResize('test_in.jpg');
 $image
 ->save('image1.jpg', IMAGETYPE_JPEG, 100)
 ->save('image2.jpg', IMAGETYPE_JPEG, 100)
 ->save('image3.jpg', IMAGETYPE_JPEG, 100)
 ->save('image4.jpg', IMAGETYPE_JPEG, 100)
 ;