'usage: new <int:xsize> <int:ysize> <int:color>:
Create and push a greyscale image of given size and color.'

def do_new(self):

    xsize = int(self.do_pop())
    ysize = int(self.do_pop())
    color = int(self.do_pop())
    self.push(Image.new('L', (xsize, ysize), color))
