raster (PIL)

[superpollo]

hi.

i wrote a program which transforms a string of zeroes ando ones into a 
png file.

#!/usr/bin/env python
import Image
import sys
bits_in_a_byte = 8
raster_string = """\
00000000000000000000000000000000
00100100111100100000100000111100
00100100100000100000100000100100
00111100111000100000100000100100
00100100100000100000100000100100
00100100111100111100111100111100
00000000000000000000000000000000
00000000000000000000000000000000
00000000111100100000111100000000
00000000100000100000100100000000
00000000100000100000111100000000
00000000100000100000100000000000
00000000111100111100100000000000
00000000000000000000000000000000
"""
raster_lines = raster_string.splitlines()
high = len(raster_lines)
wide = len(raster_lines[0])
bytes_in_a_row = wide/bits_in_a_byte
bitmap = ""
for raster_line in raster_lines:
     for byte_count in range(bytes_in_a_row):
         first_bit = byte_count*bits_in_a_byte
         bitmap += 
chr(int(raster_line[first_bit:first_bit+bits_in_a_byte] , 2))
im = Image.fromstring("1", (wide , high) , bitmap)
im.save(sys.stdout , "PNG")

any suggestions for improvement?

bye