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stephanie-w/stegano_lsb_decode.py

Last active July 2, 2025 09:22
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stegano_lsb_decode.py
from PIL import Image
import numpy as np
with Image.open("cover-secret.png") as img:
width, height = img.size
data = np.array(img)
data = np.reshape(data, width*height*3)
# extract lsb
data = data & 1
# Packs binary-valued array into 8-bits array.
data = np.packbits(data)
# Read and convert integer to Unicode characters until hitting a non-printable character
for x in data:
l = chr(x)
if not l.isprintable():
break
print(l, end='')
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