trail.py - my script to average frames in a nice way

Here is a bit of code I use to save a LOT of time in Paint Shop Pro. You run this python script with a single parameter - a file mask... (for me it's usually _*.tif)

This program will then take all the files in the current folder that match the mask, and average them, saving intermediate steps as trailnn.jpg and the final file as merge.jpg

import os, sys
import fnmatch
import Image

mask = sys.argv[1]
count = 0

# Program to average a set of photos, producing merge.jpg as a result
#
# version 0.01
# Michael Warot
#

print mask  
for file in os.listdir('.'):
   if fnmatch.fnmatch(file, mask):
       print file
       count = count + 1
       in2 = Image.open(file)
       if count == 1:
           in1 = in2
       in1 = Image.blend(in1,in2,(1.0/count))
       in1.save("trail"+str(count)+".jpg","JPEG")
in1.save("merge.jpg","JPEG")