hide text in an image

harfler = r"""abcçdefgğhıijklmnoöprsştuüvyzxqw 0123456789!?.:,_-=;()"\/&%+'*$#"""
from PIL import Image
start = '##-start-##'
end = '##-end-##'
def embed(text, imageLoc='image.png', saveLoc='out.png'):
    print(len(text))
    print(text[:1000])
    text = '{}{}{}'.format(start,text,end)
    im = Image.open(imageLoc)
    width, height = im.size
    pixColors = im.load()
    hiddenText = calcText(text)

    for h in range(height):
        for w in range(width):
            loc = h*width+w
            if loc < len(text)*2:
                hR, hG, hB = hiddenText[loc]
                R,G,B = pixColors[w,h]
                pixColors[w,h] = R-R%2+hR, G-G%2+hG, B-B%2+hB
            else:
                im.save(saveLoc, 'PNG')
                im.close()
                return loc

def calcText(text):
    hiddenText = []
    for harf in text:
        hRGB = "{:06b}".format(harfler.find(harf))
        hRGB1, hRGB2 = hRGB[:3], hRGB[3:]
        hiddenText.append(tuple(map(int,tuple(hRGB1))))
        hiddenText.append(tuple(map(int,tuple(hRGB2))))
    return hiddenText

def readImg(imageLoc='out.png'):
    im = Image.open(imageLoc)
    width, height = im.size
    pixColors = im.load()
    hiddens = []
    for h in range(height):
        for w in range(width):
            R,G,B = pixColors[w,h]
            hiddens.append((R%2, G%2, B%2))
    hiddenLetters = [harfler[int(''.join(map(str,hiddens[i]+
                     hiddens[i+1])), 2)] for i in range(0, len(hiddens), 2)]
    hiddenText = ''.join(hiddenLetters)
    startLoc = hiddenText.find(start)+len(start)
    endLoc = hiddenText.find(end)
    hiddenText = hiddenText[startLoc:endLoc]
    return hiddenText

def onlyCode(text, imageLoc='image.png', saveLoc='OnlyCode.png'):
    print(len(text))
    print(text[:1000])
    text = '{}{}{}'.format(start,text,end)
    im = Image.open(imageLoc)
    width, height = im.size
    pixColors = im.load()
    hiddenText = calcText(text)
    for h in range(height):
        for w in range(width):
            loc = h*width+w
            if loc < len(text)*2:
                R, G, B = hiddenText[loc]
                pixColors[w,h] = R*100, G*100, B*100
            else:
                im.save(saveLoc, 'PNG')
                im.close()
                return loc