how to not let the python turtle window open

Question

import turtle 
from PIL import Image
def convert(w,name):
    w.getscreen().getcanvas().postscript(file = name+'.eps')
    fig = Image.open(name+'.eps')
    img = fig.convert('RGBA')
    return img

tur1 = turtle.Turtle()
tur1.forward(30)
img = convert(tur1,'img1')
img.show()

Is there way to not open the turtle window while its running?, I only want the image as the output.