wand = NewMagickWand()
            water = NewMagickWand()
            MagickReadImage(wand, 'img.gif')
            MagickReadImage(water, 'water.png')
            MagickSetLastIterator(wand)
            length = MagickGetIteratorIndex(wand)
            MagickSetFirstIterator(wand)
            for i in range(0, length+1):
                MagickSetIteratorIndex(wand,i)
                MagickCompositeImage(wand, water, 3, 0, 0)
            wand2 = MagickCoalesceImages(wand)
            MagickWriteImages(wand2, 'newimg.gif', 1)