><a href="#Reading-Image-from-PNG-file:-General-Usage-of-a-Hash">1.) Reading Image from PNG file: General Usage of a Hash</a></li>
  <li><a href="#Separating-RGB-and-Bit-Plane">2.) Separating RGB and Bit Plane</a>
    <ul>
      <li><a href="#Hash-Slice">Hash Slice</a></li>
      <li><a href="#A.-Separation-with-PDL">A. Separation with PDL</a></li>
      <li><a href="#B.-Separation-with-Array">B. Separation with Array</a></li>
      <li><a href="#Bit-Plane">Bit Plane</a></li>
      <li><a href="#About-Image