crop.py

#!/usr/bin/python
import os
from PIL import Image


fmt = '.tiff'
bias = 0

p = './'
a = os.listdir(p)
for i in a:
    path = p+'crop/'+i
    if i[-len(fmt):] != fmt:
        continue
    print path
    f = Image.open(i).convert('1')
    xsize,ysize=f.size
    xsize-=bias
    box=(bias,0,bias+xsize/2,ysize)
    f.crop(box).save(path + '_1' + fmt)
    box=(bias+xsize/2,0,bias+xsize,ysize)
    f.crop(box).save(path + '_2' + fmt)
    #box=(20,150,xsize-240,ysize-150)
    #f.crop(box).save(path + '_1' + fmt)