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<h2>
<span class="refentrytitle">imagegetpixel</span>
</h2>
<p>imagegetpixel —
Return the RGB pixel values of a previously opened or created image.
</p>
</div>
<div class="refsect1">
<a id="idm281472924338264"></a>
<h2>Description</h2>
<p>Return the RGB pixel values of a previously opened or created image. An image can be loaded with <a class="link" href="imageload.html" title="imageload"><em class="citetitle">imageload</em></a>. An empty image can be created with <a class="link" href="imagecreate.html" title="imagecreate"><em class="citetitle">imagecreate</em></a>.
</p>
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<div class="refsect1">
<a id="idm281472924271672"></a>
<h2>Syntax</h2>
<pre class="synopsis">ared, agreen, ablue <span class="command"><strong>imagegetpixel</strong></span> iimagenum, ax, ay</pre>
<pre class="synopsis">kred, kgreen, kblue <span class="command"><strong>imagegetpixel</strong></span> iimagenum, kx, ky</pre>
</div>
<div class="refsect1">
<a id="idm281472924268120"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>iimagenum</em></span> -- the reference of the image.. It should be a value returned by <a class="link" href="imageload.html" title="imageload"><em class="citetitle">imageload</em></a> or <a class="link" href="imagecreate.html" title="imagecreate"><em class="citetitle">imagecreate</em></a>.
</p>
</div>
<div class="refsect1">
<a id="idm281472924264568"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>ax (kx)</em></span> -- horizontal pixel position (must be a float from 0 to 1).
</p>
<p>
<span class="emphasis"><em>ay (ky)</em></span> -- vertical pixel position (must be a float from 0 to 1).
</p>
<p>
<span class="emphasis"><em>ared (kred)</em></span> -- red value of the pixel (mapped to a float from 0 to 1).
</p>
<p>
<span class="emphasis"><em>agreen (kgreen)</em></span> -- green value of the pixel (mapped to a float from 0 to 1).
</p>
<p>
<span class="emphasis"><em>ablue (kblue)</em></span> -- blue value of the pixel (mapped to a float from 0 to 1).
</p>
</div>
<div class="refsect1">
<a id="idm281472924259016"></a>
<h2>Examples</h2>
<p>
Here is an example of the imagegetpixel opcode. It uses the files <a class="ulink" href="examples/imageopcodesdemo2.csd" target="_top"><em class="citetitle">imageopcodesdemo2.csd</em></a> <a class="ulink" href="examples/test1.png" target="_top"><em class="citetitle">test1.png</em></a> and <a class="ulink" href="examples/test2.png" target="_top"><em class="citetitle">test2.png</em></a>.
</p>
<div class="example">
<a id="idm281472924255560"></a>
<p class="title">
<strong>Example 422. Example of the imagegetpixel opcode.</strong>
</p>
<div class="example-contents">
<div class="refsect1">
<a id="idm281472752068296"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
<span class="c1">; Select audio/midi flags here according to platform</span>
<span class="c1">; Audio out Audio in</span>
-odac -iadc <span class="c1">;;;RT audio I/O</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o imageopcodesdemo2.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">48000</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">100</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="c1">;By Cesare Marilungo 2008</span>
<span class="nb">zakinit</span> <span class="mi">10</span><span class="p">,</span><span class="mi">1</span>
<span class="c1">;Load the image - should be 512x512 pixels</span>
gi<span class="n">image</span> <span class="nb">imageload</span> <span class="s">"test1.png"</span>
<span class="c1">;giimage imageload "test2.png" ;--try this too</span>
gi<span class="n">imagew</span><span class="p">,</span> gi<span class="n">imageh</span> <span class="nb">imagesize</span> gi<span class="n">image</span>
gi<span class="n">wave</span> <span class="nb">ftgen</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1024</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">1</span>
gi<span class="n">frqs</span> <span class="nb">ftgen</span> <span class="mi">2</span><span class="p">,</span><span class="mi">0</span><span class="p">,</span><span class="mi">512</span><span class="p">,</span><span class="o">-</span><span class="mi">5</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span><span class="mi">512</span><span class="p">,</span><span class="mi">10</span>
gi<span class="n">amps</span> <span class="nb">ftgen</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">512</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">1</span>
<span class="kd">instr</span> <span class="nf">100</span>
k<span class="n">index</span> <span class="o">=</span> <span class="mi">0</span>
i<span class="n">cnt</span> <span class="o">=</span> gi<span class="n">imageh</span>
k<span class="n">x_</span> <span class="nb">linseg</span> <span class="mi">0</span><span class="p">,</span> <span class="nb">p3</span><span class="p">,</span> <span class="mi">1</span>
k<span class="n">env</span> <span class="nb">linseg</span> <span class="mi">0</span><span class="p">,</span> <span class="mf">.2</span><span class="p">,</span> <span class="mi">500</span><span class="p">,</span> <span class="nb">p3</span> <span class="o">-</span> <span class="mf">.4</span><span class="p">,</span> <span class="mi">500</span><span class="p">,</span> <span class="mf">.2</span><span class="p">,</span> <span class="mi">0</span>
<span class="c1">; Read a column of pixels and store the red values</span>
<span class="c1">; inside the table 'giamps'</span>
<span class="nl">loop</span><span class="p">:</span>
k<span class="n">y_</span> <span class="o">=</span> k<span class="n">index</span><span class="o">/</span>gi<span class="n">imageh</span>
<span class="c1">;Get the pixel color values at kx_, ky_</span>
k<span class="n">red</span><span class="p">,</span> k<span class="n">green</span><span class="p">,</span> k<span class="n">blue</span> <span class="nb">imagegetpixel</span> gi<span class="n">image</span><span class="p">,</span> k<span class="n">x_</span><span class="p">,</span> k<span class="n">y_</span>
<span class="c1">;Write the red values inside the table 'giamps'</span>
<span class="nb">tablew</span> k<span class="n">red</span><span class="p">,</span> k<span class="n">index</span><span class="p">,</span> gi<span class="n">amps</span>
k<span class="n">index</span> <span class="o">=</span> k<span class="n">index</span><span class="o">+</span><span class="mi">1</span>
<span class="k">if</span> <span class="p">(</span>k<span class="n">index</span> <span class="o"><</span> i<span class="n">cnt</span><span class="p">)</span> <span class="k">kgoto</span> <span class="nl">loop</span>
<span class="c1">; Use an oscillator bank (additive synthesis) to generate sound</span>
<span class="c1">; setting amplitudes for each partial according to the image</span>
a<span class="n">sig</span> <span class="nb">adsynt</span> k<span class="n">env</span><span class="p">,</span> <span class="mi">220</span><span class="p">,</span> gi<span class="n">wave</span><span class="p">,</span> gi<span class="n">frqs</span><span class="p">,</span> gi<span class="n">amps</span><span class="p">,</span> i<span class="n">cnt</span><span class="p">,</span> <span class="mi">2</span>
<span class="nb">outs</span> a<span class="n">sig</span><span class="p">,</span> a<span class="n">sig</span>
<span class="kd">endin</span>
<span class="kd">instr</span> <span class="nf">101</span>
<span class="c1">; Free memory used by the image</span>
<span class="nb">imagefree</span> gi<span class="n">image</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">t</span> <span class="mi">0</span> <span class="mi">60</span>
<span class="nb">i</span><span class="mi">100</span> <span class="mi">1</span> <span class="mi">20</span>
<span class="nb">i</span><span class="mi">101</span> <span class="mi">21</span> <span class="mi">1</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
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</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1">
<a id="idm281472924253640"></a>
<h2>See Also</h2>
<p>
<a class="link" href="imageload.html" title="imageload"><em class="citetitle">imageload</em></a>,
<a class="link" href="imagecreate.html" title="imagecreate"><em class="citetitle">imagecreate</em></a>,
<a class="link" href="imagesize.html" title="imagesize"><em class="citetitle">imagesize</em></a>,
<a class="link" href="imagesave.html" title="imagesave"><em class="citetitle">imagesave</em></a>,
<a class="link" href="imagesetpixel.html" title="imagesetpixel"><em class="citetitle">imagesetpixel</em></a>,
<a class="link" href="imagefree.html" title="imagefree"><em class="citetitle">imagefree</em></a>
</p>
</div>
<div class="refsect1">
<a id="idm281472924246760"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Cesare Marilungo</td>
</tr>
</table>
<p>
</p>
<p>New in version 5.08</p>
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