InImage.py

# https://www.geeksforgeeks.org/image-based-steganography-using-python/
from PIL import Image

def genData(data):
		newd = []
		for i in data:
			newd.append(format(ord(i), '08b'))
		return newd

def modPix(pix, data):
	datalist = genData(data)
	lendata = len(datalist)
	imdata = iter(pix)
	for i in range(lendata):
		pix = [value for value in imdata.__next__()[:3] +imdata.__next__()[:3] +imdata.__next__()[:3]]
		for j in range(0, 8):
			if (datalist[i][j] == '0' and pix[j]% 2 != 0):
				pix[j] -= 1
			elif (datalist[i][j] == '1' and pix[j] % 2 == 0):
				if(pix[j] != 0):
					pix[j] -= 1
				else:
					pix[j] += 1
		if (i == lendata - 1):
			if (pix[-1] % 2 == 0):
				if(pix[-1] != 0):
					pix[-1] -= 1
				else:
					pix[-1] += 1
		else:
			if (pix[-1] % 2 != 0):
				pix[-1] -= 1
		pix = tuple(pix)
		yield pix[0:3]
		yield pix[3:6]
		yield pix[6:9]

def encode_enc(newimg, data):
	w = newimg.size[0]
	(x, y) = (0, 0)
	for pixel in modPix(newimg.getdata(), data):
		newimg.putpixel((x, y), pixel)
		if (x == w - 1):
			x = 0
			y += 1
		else:
			x += 1

def encode(img,data,result):
	image = Image.open(img, 'r')
	if (len(data) == 0):
		raise ValueError('Data is empty')
	newimg = image.copy()
	encode_enc(newimg, data)
	newimg.save(result, str(result.split(".")[1].upper()))
	return result

def decode(img):
	image = Image.open(img, 'r')
	data = ''
	imgdata = iter(image.getdata())
	while (True):
		pixels = [value for value in imgdata.__next__()[:3] +imgdata.__next__()[:3] +imgdata.__next__()[:3]]
		binstr = ''
		for i in pixels[:8]:
			if (i % 2 == 0):
				binstr += '0'
			else:
				binstr += '1'
		data += chr(int(binstr, 2))
		if (pixels[-1] % 2 != 0):
			return data

if __name__=='__main__':
	#Write test cases
	print(decode("/home/gb/SteganographySoftware/uploads/test(new).jpeg"))
	# encode("/home/gb/SteganographySoftware/uploads/test.jpeg","Help!!!","/home/gb/SteganographySoftware/uploads/test(new).jpeg")