├── bright.png
├── naturepic.png
├── README.md
└── imgstegno.py


/bright.png:
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https://raw.githubusercontent.com/pranjalkalal/Image-stegnography/HEAD/bright.png


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/naturepic.png:
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https://raw.githubusercontent.com/pranjalkalal/Image-stegnography/HEAD/naturepic.png


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/README.md:
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 1 | # Image-stegnography
 2 | using LSB method in python.
 3 | 
 4 | ## Installation 
 5 | Use the package manager [pip](https://pip.pypa.io/en/stable/) to install 'opencv,pillow and numpy'
 6 | ```bash
 7 | pip install opencv-python
 8 | pip install pillow
 9 | pip install numpy
10 | ```
11 | ## usage
12 | 
13 | step-1. clonning--> git clone repo. or download zip file  
14 | 
15 | step-2. run 'python imgstegno.py'
16 | 
17 | step-3. give respective inputes and get outputs
18 | 
19 | 


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/imgstegno.py:
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  1 | import cv2
  2 | import numpy as np
  3 | from PIL import Image
  4 | 
  5 | #it convert data in binary formate
  6 | 
  7 | 
  8 | def data2binary(data):
  9 |     if type(data) == str:
 10 |         p = ''.join([format(ord(i), '08b')for i in data])
 11 |     elif type(data) == bytes or type(data) == np.ndarray:
 12 |         p = [format(i, '08b')for i in data]
 13 |     return p
 14 | 
 15 | 
 16 | # hide data in given img
 17 | 
 18 | def hidedata(img, data):
 19 |     data += "$$"                                   #'$$'--> secrete key
 20 |     d_index = 0
 21 |     b_data = data2binary(data)
 22 |     len_data = len(b_data)
 23 | 
 24 |  #iterate pixels from image and update pixel values
 25 | 
 26 |     for value in img:
 27 |         for pix in value:
 28 |             r, g, b = data2binary(pix)
 29 |             if d_index < len_data:
 30 |                 pix[0] = int(r[:-1] + b_data[d_index])
 31 |                 d_index += 1
 32 |             if d_index < len_data:
 33 |                 pix[1] = int(g[:-1] + b_data[d_index])
 34 |                 d_index += 1
 35 |             if d_index < len_data:
 36 |                 pix[2] = int(b[:-1] + b_data[d_index])
 37 |                 d_index += 1
 38 |             if d_index >= len_data:
 39 |                 break
 40 |     return img
 41 | 
 42 | 
 43 | def encode():
 44 |     img_name = input("\nenter image name:")
 45 |     image = cv2.imread(img_name)
 46 |     img = Image.open(img_name, 'r')
 47 |     w, h = img.size
 48 |     data = input("\nenter message:")
 49 |     if len(data) == 0:
 50 |         raise ValueError("Empty data")
 51 |     enc_img = input("\nenter encoded image name:")
 52 |     enc_data = hidedata(image, data)
 53 |     cv2.imwrite(enc_img, enc_data)
 54 |     img1 = Image.open(enc_img, 'r')
 55 |     img1 = img1.resize((w, h),Image.ANTIALIAS)
 56 |     # optimize with 65% quality
 57 |     if w != h:
 58 |         img1.save(enc_img, optimize=True, quality=65)
 59 |     else:
 60 |         img1.save(enc_img)
 61 | 
 62 | # decoding
 63 | 
 64 | def find_data(img):
 65 |     bin_data = ""
 66 |     for value in img:
 67 |         for pix in value:
 68 |             r, g, b = data2binary(pix)
 69 |             bin_data += r[-1]
 70 |             bin_data += g[-1]
 71 |             bin_data += b[-1]
 72 | 
 73 |     all_bytes = [bin_data[i: i + 8] for i in range(0, len(bin_data), 8)]
 74 | 
 75 |     readable_data = ""
 76 |     for x in all_bytes:
 77 |         readable_data += chr(int(x, 2))
 78 |         if readable_data[-2:] == "$$":
 79 |             break
 80 |     return readable_data[:-2]
 81 | 
 82 | 
 83 | def decode():
 84 |     img_name = input("\nEnter Image name : ")
 85 |     image = cv2.imread(img_name)
 86 |     img=Image.open(img_name,'r')
 87 |     msg = find_data(image)
 88 |     return msg
 89 | 
 90 | 
 91 | def stegnography():
 92 |     x = 1
 93 |     while x != 0:
 94 |        print('''\nImage stegnography
 95 |        1.encode
 96 |        2.decode''')
 97 |        u_in = int(input("\n enter your choice:"))
 98 |        if u_in == 1:
 99 |            encode()
100 |        else:
101 |            ans = decode()
102 |            print("\n your message:"+ans)
103 |        x = int(input("\nenter 1 for continue otherwise 0:"))
104 | 
105 | 
106 | stegnography()
107 | 


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