<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_image(self, string, width, height, pad=0):
 """ Byte representation of a PNG image """

        hex_digest_byte_list = self._string_to_byte_list(string)
        matrix = self._create_matrix(hex_digest_byte_list)
        return self._create_image(matrix, width, height, pad)