Snippet taken from main.py with a focus on LSB retrieving function

retrieve_data.py

while (end == False):
        while (bit_i >= 0):
            px = matrix[start_pixel]
            # colors: Red, Green and Blue
            for c in range(conf[0], conf[1]):
                if bit_i >= 0:
                    # We are getting the LSB of the pixel color, and then we shift it to the left accordingly
                    byte += (px[c]&1)<<bit_i
                    bit_i -= 1
                else:
                    break
            start_pixel = get_num_rand(used_pixels, num_of_pixels)
        if start_pixel>=num_of_pixels:
            break
        # decoded 1 byte
        message += chr(byte)
        # have I encountered the eof_marker? If yes, the decoding process is done
        if message[-len(EOF_MARKER):] == EOF_MARKER:
            end = True
        byte = 0
        bit_i = 7
        start_pixel = get_num_rand(used_pixels, num_of_pixels)