<doc>
	<legacy_id>433</legacy_id>
	<term>mask</term>
	<definition><p>A filter that allows only certain values. All <glossary tag="value">values</glossary> that don't conform to the mask are discarded.</p>
<p></p>
<p>In an <keyword tag="image">image</keyword>, a mask is used to remove transparent <property tag="pixels">pixels</property>.</p></definition>
	<categories>
	 	<category>Images &amp; Multimedia</category>
	 	<category>The System Environment</category>
	</categories>
	<synonyms>
	 	<synonym>masked</synonym>
	 	<synonym>masks</synonym>
	 	<synonym>mask's</synonym>
	 	<synonym>masks'</synonym>
	 	<synonym>mask</synonym>
	</synonyms>
</doc>