diff --git a/hello.jpg b/hello.jpg
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diff --git a/hello_qrcode.png b/hello_qrcode.png
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index 0000000..d8ac8fb
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diff --git a/hello_watermark.png b/hello_watermark.png
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index 0000000..0f9625a
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diff --git a/hello_watermark_1bit.png b/hello_watermark_1bit.png
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diff --git a/invisible watermarking.py b/invisible watermarking.py
new file mode 100644
index 0000000..277d693
--- /dev/null
+++ b/invisible watermarking.py	
@@ -0,0 +1,31 @@
+from PIL import Image
+
+from sys import argv
+from qrcode import make as makeQR
+
+if __name__ == '__main__':
+    qr = makeQR("hello sourya")
+    qw, qh = qr.size
+
+    im = Image.open("hello.jpg")
+    w, h = im.size
+
+    if qw > w:
+        qr = qr.resize((w, w))
+    elif qh > h:
+        qr = qr.resize((h, h))
+    qw, qh = qr.size
+
+    imd = im.load()
+    for i in range(w):
+        for j in range(h):
+            d = imd[i, j]
+            imd[i, j] = d[:-1] + ((d[-1] | 1) if qr.getpixel((i % qw, j % qh)) else (d[-1] & ~1),)
+
+
+    from os.path import splitext
+
+    root, ext = splitext("hello.jpg")
+    im.save(root + '_watermark.png')
+    qr.save(root+'_qrcode'+'.png')
+
diff --git a/retrive watermark.py b/retrive watermark.py
new file mode 100644
index 0000000..e5cf543
--- /dev/null
+++ b/retrive watermark.py	
@@ -0,0 +1,26 @@
+from PIL import Image
+
+from sys import argv
+from qrcode import make as makeQR
+
+if __name__ == '__main__':
+    im = Image.open("hello_watermark.png")
+    s = w, h = im.size
+    imd = im.load()
+
+    oim = Image.new('1', s)
+    oimd = oim.load()
+
+    for i in range(w):
+        for j in range(h):
+            d = imd[i, j]
+            oimd[i, j] = 255 * (d[-1] & 1)
+            # oimd[i,j] = 255 * (d[-1]>>1 & 1)
+            # oimd[i,j] = 255 * (1 if d[-1] & 0b111 == 0b111 else 0)
+
+    from os.path import splitext
+
+    root, ext = splitext("hello_watermark.png")
+    fname = root + '_1bit' + ext
+    oim.save(fname)
+