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  <h2 class="chapterHead"><span class="titlemark">Chapter&#x00A0;3</span><br /><a 
 id="x19-840003"></a>Writing VIPS operations</h2>
  <div class="sectionTOCS">
  &#x00A0;<span class="sectionToc" >3.1 <a 
href="vipsmanualse13.html#x20-850003.1">Introduction</a></span>
<br />  &#x00A0;&#x00A0;<span class="subsectionToc" >3.1.1 <a 
href="vipsmanualse13.html#x20-860003.1.1">Why use VIPS?</a></span>
<br />  &#x00A0;&#x00A0;<span class="subsectionToc" >3.1.2 <a 
href="vipsmanualse13.html#x20-870003.1.2">I/O styles</a></span>
<br />  &#x00A0;<span class="sectionToc" >3.2 <a 
href="vipsmanualse14.html#x21-880003.2">Programming WIO operations</a></span>
<br />  &#x00A0;&#x00A0;<span class="subsectionToc" >3.2.1 <a 
href="vipsmanualse14.html#x21-890003.2.1">Input from an image</a></span>
<br />  &#x00A0;&#x00A0;<span class="subsectionToc" >3.2.2 <a 
href="vipsmanualse14.html#x21-900003.2.2">Output to an image</a></span>
<br />  &#x00A0;&#x00A0;<span class="subsectionToc" >3.2.3 <a 
href="vipsmanualse14.html#x21-910003.2.3">Polymorphism</a></span>
<br />  &#x00A0;<span class="sectionToc" >3.3 <a 
href="vipsmanualse15.html#x22-920003.3">Programming PIO functions</a></span>
<br />  &#x00A0;&#x00A0;<span class="subsectionToc" >3.3.1 <a 
href="vipsmanualse15.html#x22-930003.3.1">Easy PIO with <span 
class="pcrr7t-">im</span><span 
class="pcrr7t-">_wrapone() </span>and <span 
class="pcrr7t-">im</span><span 
class="pcrr7t-">_wrapmany()</span></a></span>
<br />  &#x00A0;&#x00A0;<span class="subsectionToc" >3.3.2 <a 
href="vipsmanualse15.html#x22-940003.3.2">Region descriptors</a></span>
<br />  &#x00A0;&#x00A0;<span class="subsectionToc" >3.3.3 <a 
href="vipsmanualse15.html#x22-950003.3.3">Image input with regions</a></span>
<br />  &#x00A0;&#x00A0;<span class="subsectionToc" >3.3.4 <a 
href="vipsmanualse15.html#x22-960003.3.4">Splitting into sequences</a></span>
<br />  &#x00A0;&#x00A0;<span class="subsectionToc" >3.3.5 <a 
href="vipsmanualse15.html#x22-970003.3.5">Output to regions</a></span>
<br />  &#x00A0;&#x00A0;<span class="subsectionToc" >3.3.6 <a 
href="vipsmanualse15.html#x22-980003.3.6">Callbacks</a></span>
<br />  &#x00A0;&#x00A0;<span class="subsectionToc" >3.3.7 <a 
href="vipsmanualse15.html#x22-1020003.3.7">Memory allocation revisited</a></span>
<br />  &#x00A0;<span class="sectionToc" >3.4 <a 
href="vipsmanualse16.html#x23-1030003.4">Programming in-place functions</a></span>
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