def setPixelAlphasFromIntsRandom(image, ints):
"""
Encrypt the message into the image's alpha values starting in a random order.
"""
cleanImage(image)
pixelData = list(image.getdata())
length = len(ints)
rand = int(len(pixelData) / length)
position = 0
randomPosition = []
for i in range(length):
value = random.randint(position, (rand - 1) + position)
randomPosition.append(value)
position += value - position
for x in range(len(ints)):
r = 0
g = 0
b = 0
a = 0
try:
r, g, b, a = pixelData[randomPosition[x]]
except:
r, g, b = pixelData[randomPosition[x]]
a = 255
color = Color(r, g, b, a)
color.alpha = ints[x]
pixelData[randomPosition[x]] = color.getColor()
image.putdata(pixelData)
def setPixelAlphasFromInts(image, ints):
"""
Encrypt the message into the image's alpha values starting in top right.
"""
cleanImage(image)
pixelData = list(image.getdata())
for x in range(len(ints)):
r = 0
g = 0
b = 0
a = 0
try:
r, g, b, a = pixelData[x]
except:
r, g, b = pixelData[x]
a = 255
color = Color(r, g, b, a)
color.alpha = ints[x]
pixelData[x] = color.getColor()
image.putdata(pixelData)
def cleanImage(image):
"""
Erases a previously encrypted message in an image by resetting all of the alpha values.
"""
pixelData = list(image.getdata())
w, h = image.size
size = w * h
for x in range(size):
r = 0
g = 0
b = 0
a = 0
try:
r, g, b, a = pixelData[x]
except:
r, g, b = pixelData[x]
a = 255
a = 255
color = Color(r, g, b, a)
color.alpha = 255
pixelData[x] = color.getColor()
image.putdata(pixelData)
