import Image, ImageDraw, sys
 
dimensions = (400, 350)
img = Image.new("RGB", dimensions)
 
draw = ImageDraw.Draw(img)
num =48
 
i = num
while (i>0) : 
   draw.line((i*img.size[0]/num, 0, img.size[0], i*img.size[1]/num), (0, 255-i, 0))
   draw.line(((num-i)*img.size[0]/num, img.size[1], img.size[0], i*img.size[1]/num), (0, 255-i, 0))
 
   draw.line((0, (num-i)*img.size[1]/num, i*img.size[0]/num, 0), (0, 255-i, 0)) 
   draw.line((0, (i)*img.size[1]/num, i*img.size[0]/num, img.size[1]), (0, 255-i, 0))  
   i-=1
 
del draw 
 
# write to stdout
img.save(sys.stdout, "PNG")

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