Encoder.py

from PIL import Image
import bitarray

endMessage = "11111111"

img = Image.open("encoderImage.png")
message = input("What text would you like to encode? ")
width, height = img.size

messageBitArray = bitarray.bitarray()
messageBitArray.frombytes(message.encode('utf-8'))
messageBitArray = list(messageBitArray)

x = 0
y = 0

for bit in messageBitArray:
    coordinate = (x,y)
    try:
        [r, g, b, a] = img.getpixel(coordinate)
    except: #incase image does not have alpha
        [r, g, b] = img.getpixel(coordinate)
        a = 255
    #Turn R into r, but remove last pixel and turn it into the bit we are encoding
    RIntString = list(str(r))

    #Only change the very last number of the r string to make a minimal change
    RIntString[len(RIntString)-1] = str(bit)
    newRInt = ""
    newRInt = ''.join(RIntString)

    img.putpixel((coordinate), (int(newRInt), g, b, a))

    if x != width-1:
        x += 1
    else:
        y += 1
        x = 0

for bit in endMessage:
    coordinate = (x,y)

    #get pixel values
    try:
        [r, g, b, a] = img.getpixel(coordinate)
    except: #incase image does not have alpha
        [r, g, b] = img.getpixel(coordinate)
        a = 255

    #Turn R into r, but remove last pixel and turn it into the bit we are encoding
    RIntString = list(str(r))

    #Only change the very last number of the r string to make a minimal change
    RIntString[len(RIntString)-1] = str(bit)
    newRInt = ""
    newRInt = ''.join(RIntString)

    img.putpixel((coordinate), (int(newRInt), g, b, a))

    if x != width:
        x += 1
    else:
        y += 1
        x = 0

img.save("encoderImage.png")
print("Text successfully encoded into image!")