itance). I go two ways to solve it: (A) First I use PDL, the Perl Data Language. With PDL you can simply calculate big arrays of data. All operators can be used directly on the Piddle (PDL object). (B) Second I use Perl Arrays.</p>

<p>The steps done in this example are:</p>

<dl>

<dt id="Reading-Image-from-PNG-file:-Using-Hash">1.) Reading Image from PNG file: Using Hash</dt>
<dd>

</dd>
<dt id="Separate-RGB-and-Bit-Plane:-Hash-Slices">2.) Separate RGB and Bit Plane: Hash Slices</dt>
<dd>

</dd>
<dt id="E