 is a List of Key/Value pairs, so that values can be accessed easily by a name (key). In Perl a Hash is declared with a percent sign &quot;%&quot; (i.e. <code>%hash</code>) in front of the name. The Hash can be initialized with key/value pairs.</p>

<pre><code> %hash = ( key =&gt; $value, ... );       # Initialize Hash
 $hash{ key } = $value;                # Assign Value to Hash Element
 $var = $hash{ key };                  # Get Hash Value of Key</code></pre>

<p>As example I read a PNG file and store ev