#!/usr/bin/env python
"compress all tiff files in subdirectories. Requires ImageMagick library"
import os

def testtif(file):      #returns true if not compressed
    stdout_handle = os.popen('identify -verbose "' + file + '" | grep LZW', 'r')
    text = stdout_handle.read()
    return len(text) == 0

def compress(file):
    compress='convert -compress lzw '
    tempname='temp.tif'
    print 'compressing "' + file + '"'
    os.system(compress + '"' + file + '" ' + tempname)
    os.remove(file)
    os.rename(tempname, file)

#walk through directory tree
for root, dirs, files in os.walk('.'):
    for name in files:
        #print 'checking ' + os.path.join(root,name)
        if name.endswith('.tif'):
            if testtif(os.path.join(root,name)):
                compress(os.path.join(root,name))
            else:
                print '    ...' + os.path.join(root,name) + ' already compressed!'