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  1. <?xml version="1.0" encoding="UTF-8" standalone="no"?>
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  4.   <head>
  5.     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
  6.     <title>11.22.¬† Alien Map</title>
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  12.     <link rel="start" href="index.html" title="GNU Image Manipulation Program" />
  13.     <link rel="up" href="gimp-imagewindow-menus-colors.html" title="11.¬† The ‚ÄúColors‚Äù Menu" />
  14.     <link rel="prev" href="plug-in-color-adjust.html" title="11.21.¬† Adjust Foreground & Background" />
  15.     <link rel="next" href="plug-in-exchange.html" title="11.23.¬† Color Exchange" />
  16.   </head>
  17.   <body>
  18.     <div class="navheader">
  19.       <table width="100%" summary="Navigation header">
  20.         <tr>
  21.           <th colspan="3" align="center">11.22.¬†
  22.     <span lang="en" xml:lang="en">Alien Map</span>
  23.   </th>
  24.         </tr>
  25.         <tr>
  26.           <td width="20%" align="left"><a accesskey="p" href="plug-in-color-adjust.html"><img src="../images/prev.png" alt="Prev" /></a>¬†</td>
  27.           <th width="60%" align="center">11.¬†
  28.     <span lang="en" xml:lang="en">The ‚Äú<span class="quote">Colors</span>‚Äù Menu</span>
  29.   </th>
  30.           <td width="20%" align="right">¬†<a accesskey="n" href="plug-in-exchange.html"><img src="../images/next.png" alt="Next" /></a></td>
  31.         </tr>
  32.       </table>
  33.       <hr />
  34.     </div>
  35.     <div class="sect2" lang="en" xml:lang="en">
  36.       <div class="titlepage">
  37.         <div>
  38.           <div>
  39.             <h3 class="title"><a id="plug-in-alienmap2"></a>11.22.¬†
  40.     <span lang="en" xml:lang="en">Alien Map</span>
  41.   </h3>
  42.           </div>
  43.           <div>
  44.             <div class="revhistory">
  45.               <table border="1" width="100%" summary="Revision history">
  46.                 <tr>
  47.                   <th align="left" valign="top" colspan="3">
  48.                     <b>Revision History</b>
  49.                   </th>
  50.                 </tr>
  51.                 <tr>
  52.                   <td align="left">Revision $Revision: 2342 $</td>
  53.                   <td align="left">2007-10-23</td>
  54.                   <td align="left">ude</td>
  55.                 </tr>
  56.               </table>
  57.             </div>
  58.           </div>
  59.         </div>
  60.       </div>
  61.       <a id="id2722252" class="indexterm"></a>
  62.       <a id="id2722266" class="indexterm"></a>
  63.       <div class="sect3" lang="en" xml:lang="en">
  64.         <div class="titlepage">
  65.           <div>
  66.             <div>
  67.               <h4 class="title"><a id="id2722275"></a>11.22.1.¬†
  68.       <span lang="en" xml:lang="en">Overview</span>
  69.     </h4>
  70.             </div>
  71.           </div>
  72.         </div>
  73.         <div class="figure">
  74.           <a id="id2722286"></a>
  75.           <p class="title">
  76.             <b>Figure¬†15.169.¬†
  77.         <span lang="en" xml:lang="en">
  78.           Alien Map filter example
  79.         </span>
  80.       </b>
  81.           </p>
  82.           <div class="figure-contents">
  83.             <div class="mediaobject">
  84.               <img src="../images/filters/examples/taj_orig.jpg" alt="Alien Map filter example" />
  85.               <div class="caption">
  86.                 <p>Original image</p>
  87.               </div>
  88.             </div>
  89.             <div class="mediaobject">
  90.               <img src="../images/filters/examples/color-taj-alien2.jpg" alt="Alien Map filter example" />
  91.               <div class="caption">
  92.                 <p>Filter applied</p>
  93.               </div>
  94.             </div>
  95.           </div>
  96.         </div>
  97.         <br class="figure-break" />
  98.         <p>
  99.       This filter renders very modified colors by applying trigonometric
  100.       functions. Alien Map can work on
  101.       <a class="link" href="glossary.html#glossary-colormodel" title="Color model">RGB and HSV</a>.
  102.     </p>
  103.       </div>
  104.       <div class="sect3" lang="en" xml:lang="en">
  105.         <div class="titlepage">
  106.           <div>
  107.             <div>
  108.               <h4 class="title"><a id="id2722367"></a>11.22.2.¬†
  109.       <span lang="en" xml:lang="en">Activate the filter</span>
  110.     </h4>
  111.             </div>
  112.           </div>
  113.         </div>
  114.         <p>
  115.       You can find this filter in the image window menu under
  116.       <span class="guimenu">Colors</span> ‚Üí <span class="guisubmenu">Map</span> ‚Üí <span class="guimenuitem">Alien Map</span>.
  117.     </p>
  118.       </div>
  119.       <div class="sect3" lang="en" xml:lang="en">
  120.         <div class="titlepage">
  121.           <div>
  122.             <div>
  123.               <h4 class="title"><a id="id2722410"></a>11.22.3.¬†
  124.       <span lang="en" xml:lang="en">Options</span>
  125.     </h4>
  126.             </div>
  127.           </div>
  128.         </div>
  129.         <div class="figure">
  130.           <a id="id2722420"></a>
  131.           <p class="title">
  132.             <b>Figure¬†15.170.¬†
  133.         <span lang="en" xml:lang="en">
  134.           Options for the ‚Äú<span class="quote">Alien Map</span>‚Äù filter
  135.         </span>
  136.       </b>
  137.           </p>
  138.           <div class="figure-contents">
  139.             <div class="mediaobject">
  140.               <img src="../images/menus/colors-map-alienmap.png" alt="Options for the Alien Map filter" />
  141.             </div>
  142.           </div>
  143.         </div>
  144.         <br class="figure-break" />
  145.         <div class="variablelist">
  146.           <dl>
  147.             <dt>
  148.               <span class="term">Preview</span>
  149.             </dt>
  150.             <dd>
  151.               <p>
  152.             This preview displays results of filter application interactively.
  153.           </p>
  154.             </dd>
  155.             <dt>
  156.               <span class="term">Mode</span>
  157.             </dt>
  158.             <dd>
  159.               <p>
  160.             Radio buttons <span class="guilabel">RGB Color Channel</span> and
  161.             <span class="guilabel">HSV Color Channel</span>
  162.             let you select the color space you want to use.
  163.           </p>
  164.               <p>
  165.             Check boxes <span class="guilabel">Modify ... Channel</span> let you
  166.             select RGB/HSV Channel you want to work with.
  167.           </p>
  168.             </dd>
  169.             <dt>
  170.               <span class="term">Sliders</span>
  171.             </dt>
  172.             <dd>
  173.               <p>
  174.             For each channel, you can set Frequency (0-5) and Phaseshift
  175.             (0-360) of sine-cosine functions, using either sliders or input
  176.             boxes and their arrowheads.
  177.           </p>
  178.               <p>
  179.             <span class="guilabel">Frequency</span> around 0.3 to 0.7 provides a
  180.             curve that is similar to the linear function (original image),
  181.             only darker or with more contrast. As you raise the frequency
  182.             level, you'll get an increasing variation in pixel
  183.             transformation, meaning that the image will get more and more
  184.             ‚Äú<span class="quote">alien</span>‚Äù.
  185.           </p>
  186.               <p>
  187.             <span class="guilabel">Phase</span> alters the value transformation. 0
  188.             and 360 degrees are the same as a sine function and 90 is the
  189.             same as a cosine function. 180 inverts sine and 270 inverts
  190.             cosine.
  191.           </p>
  192.             </dd>
  193.           </dl>
  194.         </div>
  195.       </div>
  196.     </div>
  197.     <div class="navfooter">
  198.       <hr />
  199.       <table width="100%" summary="Navigation footer">
  200.         <tr>
  201.           <td width="40%" align="left"><a accesskey="p" href="plug-in-color-adjust.html"><img src="../images/prev.png" alt="Prev" /></a>¬†</td>
  202.           <td width="20%" align="center">
  203.             <a accesskey="u" href="gimp-imagewindow-menus-colors.html">
  204.               <img src="../images/up.png" alt="Up" />
  205.             </a>
  206.           </td>
  207.           <td width="40%" align="right">¬†<a accesskey="n" href="plug-in-exchange.html"><img src="../images/next.png" alt="Next" /></a></td>
  208.         </tr>
  209.         <tr>
  210.           <td width="40%" align="left" valign="top"><a accesskey="p" href="plug-in-color-adjust.html">11.21.¬†
  211.     <span lang="en" xml:lang="en">Adjust Foreground & Background</span>
  212.   </a>¬†</td>
  213.           <td width="20%" align="center">
  214.             <a accesskey="h" href="index.html">
  215.               <img src="../images/home.png" alt="Home" />
  216.             </a>
  217.           </td>
  218.           <td width="40%" align="right" valign="top">¬†<a accesskey="n" href="plug-in-exchange.html">11.23.¬†
  219.     <span lang="en" xml:lang="en">Color Exchange</span>
  220.   </a></td>
  221.         </tr>
  222.       </table>
  223.     </div>
  224.   </body>
  225. </html>
  226.