[Python] Can't save images using python ImageEnhance module

I am a new python programmer and I am trying to use the ImageEnhance module to create a set of images that increase sharpness over time.

The script below works with one problem: the new images are being save to a temporary directory that quickly deletes the files.

How do I alter the save function to point to a proper directory.

Thanks in advance.

#import modules
import sys
import os
import Image, ImageEnhance,

#find directory, load picture
os.chdir ("/Users/ericmaie/Desktop/test")
backup_directory = "/Users/harddrive/Desktop/test2"

counter = 1

while (counter < 5):

ima = Image.open("1.png")
enhancer = ImageEnhance.Sharpness(ima)
factor = (counter + 10) / 4.0
enhancer.enhance(factor).show("Sharpness %f" % factor)
ima.save(str(counter) + '.jpg')

counter = counter + 1

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