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Removed reveal_slow(). Factorization of code (table of color components [r,g,b]).

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cedricbonhomme 2011-03-23 23:02:02 +01:00
parent 707e69a274
commit e756196ee3
1 changed files with 12 additions and 57 deletions
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51
lsb-s.py
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@ -78,9 +78,10 @@ def reveal(img):
limit = None limit = None
for row in xrange(height): for row in xrange(height):
for col in xrange(width): for col in xrange(width):
r, g, b = img.getpixel((col, row))
buff += (r&1)<<(7-count) # color = [r, g, b]
for color in img.getpixel((col, row)):
buff += (color&1)<<(7-count)
count += 1 count += 1
if count == 8: if count == 8:
bitab.append(chr(buff)) bitab.append(chr(buff))
@ -91,56 +92,10 @@ def reveal(img):
except: except:
pass pass
buff += (g&1)<<(7-count)
count += 1
if count == 8:
bitab.append(chr(buff))
buff, count = 0, 0
if bitab[-1] == ":" and limit == None:
try:
limit = int("".join(bitab[:-1]))
except:
pass
buff += (b&1)<<(7-count)
count += 1
if count == 8:
bitab.append(chr(buff))
buff, count = 0, 0
if bitab[-1] == ":" and limit == None:
try:
limit = int("".join(bitab[:-1]))
except:
pass
if len(bitab)-len(str(limit))-1 == limit : if len(bitab)-len(str(limit))-1 == limit :
return "".join(bitab)[len(str(limit))+1:] return "".join(bitab)[len(str(limit))+1:]
return "" return ""
def reveal_slow(img):
"""
Find a message in an image
(with the LSB technique).
"""
width, height = img.size
bits = []
for row in xrange(height):
for col in xrange(width):
r, g, b = img.getpixel((col, row))
bits.append([tools.bs(r)[-1], tools.bs(g)[-1], tools.bs(b)[-1]])
if int("".join(bits[-8:]), 2) == 126:
# chr(126) = '~ '
list_of_string_bits = ["".join(bits[i:(i+8)]) for i in range(0, len(bits)-8, 8)]
list_of_character = [chr(int(elem, 2)) for elem in list_of_string_bits]
return "".join(list_of_character)
return ""
if __name__ == '__main__': if __name__ == '__main__':
# Point of entry in execution mode. # Point of entry in execution mode.
from optparse import OptionParser from optparse import OptionParser