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Misc improvements.

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Cédric Bonhomme 2016-05-21 22:20:05 +02:00
parent 6cd22dfe72
commit d850bbd8a0
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GPG key ID: A1CB94DE57B7A70D
6 changed files with 30 additions and 31 deletions
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24
stegano/red/red.py
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@ -34,11 +34,11 @@ def hide(input_image_file, message):
Use the red portion of a pixel (r, g, b) tuple to
hide the message string characters as ASCII values.
The red value of the first pixel is used for length of the string.
The red value of the first pixel is used for message_length of the string.
"""
length = len(message)
assert length != 0, "lenght of message is null"
assert length < 255, "message is too long"
message_length = len(message)
assert message_length != 0, "message message_length is zero"
assert message_length < 255, "message is too long"
img = Image.open(input_image_file)
# Use a copy of image to hide the text in
encoded = img.copy()
@ -47,16 +47,17 @@ def hide(input_image_file, message):
for row in range(height):
for col in range(width):
(r, g, b) = img.getpixel((col, row))
# first value is length of message
if row == 0 and col == 0 and index < length:
asc = length
elif index <= length:
# first value is message_length of message
if row == 0 and col == 0 and index < message_length:
asc = message_length
elif index <= message_length:
c = message[index -1]
asc = ord(c)
else:
asc = r
encoded.putpixel((col, row), (asc, g , b))
index += 1
img.close()
return encoded
def reveal(input_image_file):
@ -65,7 +66,7 @@ def reveal(input_image_file):
Check the red portion of an pixel (r, g, b) tuple for
hidden message characters (ASCII values).
The red value of the first pixel is used for length of string.
The red value of the first pixel is used for message_length of string.
"""
img = Image.open(input_image_file)
width, height = img.size
@ -76,10 +77,11 @@ def reveal(input_image_file):
r, g, b = img.getpixel((col, row))
# First pixel r value is length of message
if row == 0 and col == 0:
length = r
elif index <= length:
message_length = r
elif index <= message_length:
message += chr(r)
index += 1
img.close()
return message
def write(image, output_image_file):