steganography.py 文件源码

def extract_text(img):
    image = Image.open(img)
    length = image.size
    p = image.load()

    leng = ""
    for pix in pixels(length):
        leng += "".join("1" if color % 2 else "0" for color in p[pix][:3])
        if len(leng) >= RESERVED_PIXELS * 3:
            leng = int(leng, 2)
            break

    binary_information = ""
    for pix in pixels(length):
        binary_information += "".join("1" if color % 2 else "0" for color in p[pix][:3])

    return binary_information[RESERVED_PIXELS * 3 : leng + RESERVED_PIXELS * 3]