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<h3 class="sectionHead"><span class="titlemark">6.15 </span> <a
id="x47-880006.15"></a>Calling VIPS functions</h3>
<!--l. 1559--><p class="noindent" ><a name="nip_label_sec:callvips"></a>
<!--l. 1561--><p class="indent" > You can call any VIPS operation which has the following
properties:
<ul class="itemize1">
<li class="itemize">There must be at least 1 output argument. If there’s
a single output argument, that becomes the value
of the function. If there is more than one output,
then the function returns a list with the outputs as
members.
</li>
<li class="itemize">The output arguments must all be one of:
<ul class="itemize2">
<li class="itemize"><span class="obeylines-h"><span class="verb"><span
class="pcrr7t-">IM_TYPE_DOUBLE</span></span></span>,
</li>
<li class="itemize"><span class="obeylines-h"><span class="verb"><span
class="pcrr7t-">IM_TYPE_INT</span></span></span>,
</li>
<li class="itemize"><span class="obeylines-h"><span class="verb"><span
class="pcrr7t-">IM_TYPE_COMPLEX</span></span></span>,
</li>
<li class="itemize"><span class="obeylines-h"><span class="verb"><span
class="pcrr7t-">IM_TYPE_STRING</span></span></span>,
</li>
<li class="itemize"><span class="obeylines-h"><span class="verb"><span
class="pcrr7t-">IM_TYPE_IMAGE</span></span></span>,
</li>
<li class="itemize"><span class="obeylines-h"><span class="verb"><span
class="pcrr7t-">IM_TYPE_DOUBLEVEC</span></span></span>,
</li>
<li class="itemize"><span class="obeylines-h"><span class="verb"><span
class="pcrr7t-">IM_TYPE_DMASK</span></span></span>,
</li>
<li class="itemize"><span class="obeylines-h"><span class="verb"><span
class="pcrr7t-">IM_TYPE_IMASK</span></span></span></li></ul>
</li>
<li class="itemize">The input arguments must all be one of the types
above, or <span class="obeylines-h"><span class="verb"><span
class="pcrr7t-">IM_TYPE_DISPLAY</span></span></span>. If an argument is an
input display, <span
class="pcrr7t-">nip2 </span>passes in its current display
structure, it does not take a display from your
program.
</li></ul> <!--l. 1591--><p class="indent" > When <span
class="pcrr7t-">nip2 </span>starts up, it loads any VIPS plug ins it can
find on its data search path. You can call functions from
plug ins in just the same way. For information on writing
plug ins, see the <span
class="ptmri7t-">VIPS Manual</span>.
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