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How can I save an image from sage plot ?

I am working on a project that needs the graph image generated by sage to save to disk then that would be retrieved in the application. Here is the code I am writing for generating a Graph

G=Graph({'a': {'c': 25, 'b': 26, 'e': 30, 'd': 35}, 'c': {'a': 25, 'b': 33, 'e':
27, 'd': 7}, 'b': {'a': 26, 'c': 33, 'e': 34, 'd': 7}, 'e': {'a': 30,
'c': 27, 'b': 34, 'd': 9}, 'd': {'a': 35, 'c': 7, 'b': 7, 'e': 9}})

G.weighted(True)

E = kruskal(G, check=True)

print E

tot=[]

kcost=0;totcost=0

for key in E:

        tot.append((key[0],key[1]))
        kcost=kcost+key[2]

rev=tot[::-1]

for key in rev:

        tot.append((key[1],key[0]))

path=[]

tot1=[]    

for key in E:

        tot1.append((key[0],key[1]))
        tot1.append((key[0],key[1]))
        kcost=kcost+key[2]


for p in tot1:

        if p[0] not in path:
            path.append(p[0])
        if p[1] not in path:
            path.append(p[1])

print path 

print tot1    

kcost=totcost/2

print tot,totcost,kcost

N=Graph(E)

N.show()

N1=Graph(tot1)

N1.show()

N.show() and N1.show() will show the Graph describing Now I am facing error running the file and generating image and my image viewer gives me error as in this post of your Google + community I have posted

https://plus.google.com/u/0/113942220708315173370/posts/jScisbFzeDr

So I am Planning to save the image at my selected location and fetch the image from that Position. for that I am using in my code and unsure where to supply a or how to save it Please suggest me how should I save the Images from show() method. I am using Python2.7 does it require some additional package of sagemath.

N1=Graph(tot)
a=N1.show()
newimage=Image.new("RGB",(500,500),"white")
newimage.load()    
newimage.save("out.png")