def hide(input_image_file, message, generator_function):
"""
Hide a message (string) in an image with the
LSB (Least Significant Bit) technique.
"""
img = Image.open(input_image_file)
img_list = list(img.getdata())
width, height = img.size
index = 0
message = str(len(message)) + ":" + message
#message_bits = tools.a2bits(message)
message_bits = "".join(tools.a2bits_list(message))
npixels = width * height
if len(message_bits) > npixels * 3:
return """Too long message (%s > %s).""" % (len(message_bits),
npixels * 3)
generator = getattr(generators, generator_function)()
while index + 3 <= len(message_bits):
generated_number = generator.next()
(r, g, b) = img_list[generated_number]
# Change the Least Significant Bit of each colour component.
r = tools.setlsb(r, message_bits[index])
g = tools.setlsb(g, message_bits[index + 1])
b = tools.setlsb(b, message_bits[index + 2])
# Save the new pixel
img_list[generated_number] = (r, g, b)
index += 3
# create empty new image of appropriate format
encoded = Image.new('RGB', (img.size))
# insert saved data into the image
encoded.putdata(img_list)
return encoded
def hide(input_image_file, message, generator_function):
"""
Hide a message (string) in an image with the
LSB (Least Significant Bit) technique.
"""
img = Image.open(input_image_file)
img_list = list(img.getdata())
width, height = img.size
index = 0
message = str(len(message)) + ":" + message
#message_bits = tools.a2bits(message)
message_bits = "".join(tools.a2bits_list(message))
npixels = width * height
if len(message_bits) > npixels * 3:
raise Exception("""The message you want to hide is too long (%s > %s).""" % (len(message_bits), npixels * 3))
generator = getattr(generators, generator_function)()
while index + 3 <= len(message_bits) :
generated_number = next(generator)
(r, g, b) = img_list[generated_number]
# Change the Least Significant Bit of each colour component.
r = tools.setlsb(r, message_bits[index])
g = tools.setlsb(g, message_bits[index+1])
b = tools.setlsb(b, message_bits[index+2])
# Save the new pixel
img_list[generated_number] = (r, g , b)
index += 3
# create empty new image of appropriate format
encoded = Image.new('RGB', (img.size))
# insert saved data into the image
encoded.putdata(img_list)
return encoded
def hide(input_image_file, message):
"""
Hide a message (string) in an image with the
LSB (Least Significant Bit) technique.
"""
img = Image.open(input_image_file)
encoded = img.copy()
width, height = img.size
index = 0
message = str(len(message)) + ":" + message
#message_bits = tools.a2bits(message)
message_bits = "".join(tools.a2bits_list(message))
print message_bits
npixels = width * height
if len(message_bits) > npixels * 3:
raise Exception(
"""The message you want to hide is too long (%s > %s).""" %
(len(message_bits), npixels * 3))
for row in range(height):
for col in range(width):
if index + 3 <= len(message_bits):
# Get the colour component.
(r, g, b) = img.getpixel((col, row))
# Change the Least Significant Bit of each colour component.
r = tools.setlsb(r, message_bits[index])
g = tools.setlsb(g, message_bits[index + 1])
b = tools.setlsb(b, message_bits[index + 2])
# Save the new pixel
encoded.putpixel((col, row), (r, g, b))
index += 3
return encoded
def hide(input_image_file, message):
"""
Hide a message (string) in an image with the
LSB (Least Significant Bit) technique.
"""
img = Image.open(input_image_file)
encoded = img.copy()
width, height = img.size
index = 0
message = str(len(message)) + ":" + message
#message_bits = tools.a2bits(message)
message_bits = "".join(tools.a2bits_list(message))
print message_bits
npixels = width * height
if len(message_bits) > npixels * 3:
raise Exception("""The message you want to hide is too long (%s > %s).""" % (len(message_bits), npixels * 3))
for row in range(height):
for col in range(width):
if index + 3 <= len(message_bits) :
# Get the colour component.
(r, g, b) = img.getpixel((col, row))
# Change the Least Significant Bit of each colour component.
r = tools.setlsb(r, message_bits[index])
g = tools.setlsb(g, message_bits[index+1])
b = tools.setlsb(b, message_bits[index+2])
# Save the new pixel
encoded.putpixel((col, row), (r, g , b))
index += 3
return encoded
def hide(img, message):
"""
Hide a message (string) in an image with the
LSB (Least Significant Bit) technique.
"""
encoded = img.copy()
width, height = img.size
index = 0
message = message + '~~~'
message_bits = tools.a2bits(message)
npixels = width * height
if len(message_bits) > npixels * 3:
return """Too long message (%s > %s).""" % (len(message_bits),
npixels * 3)
for row in range(height):
for col in range(width):
if index + 3 <= len(message_bits):
# Get the colour component.
(r, g, b) = img.getpixel((col, row))
# Change the Least Significant Bit of each colour component.
r = tools.setlsb(r, message_bits[index])
g = tools.setlsb(g, message_bits[index + 1])
b = tools.setlsb(b, message_bits[index + 2])
# Save the new pixel
encoded.putpixel((col, row), (r, g, b))
index += 3
return encoded
