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| <h3 class="sectionHead"><span class="titlemark">2.1 </span> <a |
| id="x13-360002.1"></a>Introduction</h3> |
| <!--l. 2--><p class="noindent" ><a name="nip_label_sec:appl"></a> |
| <!--l. 4--><p class="indent" > This chapter explains how to call VIPS functions from C |
| programs. It does not explain how to write new image |
| processing operations (see <span |
| class="cmsy-10">§</span><a |
| href="vipsmanualse13.html#x20-850003.1">3.1<!--tex4ht:ref: sec:oper --></a>), only how to call the ones |
| that VIPS provides. If you want to call VIPS functions fromC++ programs, you can either use the interface described |
| here or you can try out the much nicer C++ interface |
| described in <span |
| class="cmsy-10">§</span><a |
| href="vipsmanualse1.html#x6-50001.1">1.1<!--tex4ht:ref: sec:cpp --></a>. |
| <!--l. 10--><p class="indent" > See <span |
| class="cmsy-10">§</span><a |
| href="vipsmanualse17.html#x25-1050004.1">4.1<!--tex4ht:ref: sec:ref --></a> for an introduction to the image processing |
| operations available in the library. Figure <a |
| href="#x13-360011">2.1<!--tex4ht:ref: fg:architecture --></a> tries to show |
| an overview of this structure. |
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| <!--l. 15--><p class="noindent" ><img |
| src="figs/arch.png" alt="PIC" |
| ></div> |
| <br /> <div class="caption" |
| ><span class="id">Figure 2.1: </span><span |
| class="content">VIPS software architecture</span></div><!--tex4ht:label?: x13-360011 --> |
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| <!--l. 20--><p class="indent" > VIPS includes a set of UNIX manual pages. Enter (for |
| example): |
| <div class="verbatim" id="verbatim-49"> |
| example% man im_extract |
| </div> |
| <!--l. 24--><p class="nopar" > |
| <!--l. 26--><p class="noindent" >to get an explanation of the <span class="obeylines-h"><span class="verb"><span |
| class="pcrr7t-">im_extract()</span></span></span> function. |
| <!--l. 29--><p class="indent" > All the command-line VIPS operations will print help |
| text too. For example: |
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| <div class="verbatim" id="verbatim-50"> |
| example% vips im_extract |
|  <br />usage: vips im_extract input output |
|  <br />  left top width height band |
|  <br />where: |
|  <br />        input is of type "image" |
|  <br />        output is of type "image" |
|  <br />        left is of type "integer" |
|  <br />        top is of type "integer" |
|  <br />        width is of type "integer" |
|  <br />        height is of type "integer" |
|  <br />        band is of type "integer" |
|  <br />extract area/band, from package |
|  <br />  "conversion" |
|  <br />flags: (PIO function) |
|  <br />  (coordinate transformer) |
|  <br />  (area operation) |
|  <br />  (result can be cached) |
|  <br />vips: error calling function |
|  <br />im_run_command: too few arguments |
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