Taking sections from a copied image not working

#!/usr/bin/python
# 
# test_things.py

#
# imports here
#
import sys, os
import Image

def main():

    infile = "test_images/AS16_M_0491.jpg"
    sects_wide = 4
    sects_down = 3

#
# open the image if we can
#   
    try:
        im = Image.open(infile)        
    except IOError:
        print "Cannot open the input file " + infile
        sys.exit(77)
        pass
#
# get image details
#
    width = im.size[0]
    height = im.size[1]
    mode = im.mode

# new image canvas
    new_w = 2400
    new_d = 2430
    newsize = (int(new_w), int(new_d))
    imnew = Image.new('RGB', newsize, (255,0,0)) # new image same size but black background    

# copy old image into new image canvas
    uleft = 0
    udown = 0
    bleft = new_w
    bdown = new_d
    box = (uleft, udown, bleft, bdown)
    region = im.crop(box) # apply from input image    
    imnew.paste(region, box) # write out the box to output image
    # imnew now contains new copy of original

    s_width = 600
    s_depth = 810

    # create a new smaller image canvas (C)
    sect_size = ( s_width, s_depth )
    imout = Image.new('RGB', sect_size, (255,0,0) ) # new image section size
    
    # copy section of full sized image to smaller section canvas
    uleft = 0
    udown = 0        
    bleft = 600
    bdown = 810
    box = (uleft, udown, bleft, bdown)        
    region = imnew.crop(box) # apply from input image    
    imout.paste(region, box) # write out the box to output image
    
    # show a thumbnail of new smaller seection of copied original
    size = (s_width/sects_wide),(s_depth/sects_down)  # gets proportioned to original imageout size (256x256) => (50x50)
    imout.thumbnail(size)
    imout.show()

    # -------create another new smaller image canvas (D)---------------
    # create a new smaller image canvas
    sect_size = ( s_width, s_depth )
    imout = Image.new('RGB', sect_size, (255,0,0) ) # new image section size
    
    # copy section of full sized image to smaller section canvas
    uleft = 600
    udown = 810        
    bleft = 1200
    bdown = 810
    box = (uleft, udown, bleft, bdown)        
    region = imnew.crop(box) # apply from input image    
    imout.paste(region, box) # write out the box to output image
    
    # show a thumbnail of new smaller seection of copied original
    size = (s_width/sects_wide),(s_depth/sects_down)  # gets proportioned to original imageout size (256x256) => (50x50)
    imout.thumbnail(size)
    imout.show()

    sys.exit()

#
if __name__ == '__main__':
  main()

#!/bin/bash

# Purpose: split an image into top and bottom pieces
# Output: 2 files in same format as input having names top and bot prepended
# Use: the argument is the image name to split.

if [[ ! -f $1 ]]
then
  echo Use: the argument is the image name to split.
  exit 1
fi

identify $1 | gawk '{
  name = $1
  split($3,g,/x/)
  h = int(g[2]/2)
  printf"convert %s -crop %dx%d+0+0  top%s\n",name,g[1],h,  name
  printf"convert %s -crop %dx%d+0+%d bot%s\n",name,g[1],h,h,name
}' | bash

def imagecopy (dst_im, src_im, dst_x, dst_y, src_x, src_y, src_w, src_h): 
    src_im_crop = src_im.crop((src_x, src_y, src_x + src_w, src_y + src_h)) 
    dst_im.paste(src_im_crop, (dst_x, dst_y)) 
    return True