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  6.     <title>7.6.¬† Supernova</title>
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  13.     <link rel="up" href="filters-light-and-shadow.html" title="7.¬† Light and Shadow Filters" />
  14.     <link rel="prev" href="plug-in-sparkle.html" title="7.5.¬† Sparkle" />
  15.     <link rel="next" href="script-fu-drop-shadow.html" title="7.7.¬† Drop Shadow" />
  16.   </head>
  17.   <body>
  18.     <div class="navheader">
  19.       <table width="100%" summary="Navigation header">
  20.         <tr>
  21.           <th colspan="3" align="center">7.6.¬†
  22.     <span lang="en" xml:lang="en">Supernova</span>
  23.   </th>
  24.         </tr>
  25.         <tr>
  26.           <td width="20%" align="left"><a accesskey="p" href="plug-in-sparkle.html"><img src="../images/prev.png" alt="Prev" /></a>¬†</td>
  27.           <th width="60%" align="center">7.¬†
  28.     <span lang="en" xml:lang="en">Light and Shadow Filters</span>
  29.   </th>
  30.           <td width="20%" align="right">¬†<a accesskey="n" href="script-fu-drop-shadow.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-nova"></a>7.6.¬†
  40.     <span lang="en" xml:lang="en">Supernova</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: 2352 $</td>
  53.                   <td align="left">2007-07-14</td>
  54.                   <td align="left">j.h</td>
  55.                 </tr>
  56.               </table>
  57.             </div>
  58.           </div>
  59.         </div>
  60.       </div>
  61.       <a id="id2745007" class="indexterm"></a>
  62.       <a id="id2745025" 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="id2745034"></a>7.6.1.¬†
  68.       <span lang="en" xml:lang="en">Overview</span>
  69.     </h4>
  70.             </div>
  71.           </div>
  72.         </div>
  73.         <div class="figure">
  74.           <a id="id2745044"></a>
  75.           <p class="title">
  76.             <b>Figure¬†16.83.¬†
  77.         <span lang="en" xml:lang="en">Applying example for the Supernova filter</span>
  78.       </b>
  79.           </p>
  80.           <div class="figure-contents">
  81.             <div class="mediaobject">
  82.               <img src="../images/filters/examples/taj_orig.jpg" alt="Applying example for the Supernova filter" />
  83.               <div class="caption">
  84.                 <p>Original image</p>
  85.               </div>
  86.             </div>
  87.             <div class="mediaobject">
  88.               <img src="../images/filters/examples/light-taj-nova.jpg" alt="Applying example for the Supernova filter" />
  89.               <div class="caption">
  90.                 <p>Filter ‚Äú<span class="quote">Supernova</span>‚Äù applied</p>
  91.               </div>
  92.             </div>
  93.           </div>
  94.         </div>
  95.         <br class="figure-break" />
  96.         <p>
  97.       This filter creates a big star reminding a super-nova. It works with
  98.       RGB and GRAY images. Light effect decreases according to 1/r where r
  99.       is the distance from star center.
  100.     </p>
  101.       </div>
  102.       <div class="sect3" lang="en" xml:lang="en">
  103.         <div class="titlepage">
  104.           <div>
  105.             <div>
  106.               <h4 class="title"><a id="id2745122"></a>7.6.2.¬†
  107.       <span lang="en" xml:lang="en">Activate the filter</span>
  108.     </h4>
  109.             </div>
  110.           </div>
  111.         </div>
  112.         <p>
  113.       This filter is found in the image window menu under
  114.       <span class="guimenu">Filte<span class="accel">r</span>s</span> ‚Üí <span class="guisubmenu"><span class="accel">L</span>ight and Shadow</span> ‚Üí <span class="guimenuitem">Super<span class="accel">n</span>ova</span>.
  115.     </p>
  116.       </div>
  117.       <div class="sect3" lang="en" xml:lang="en">
  118.         <div class="titlepage">
  119.           <div>
  120.             <div>
  121.               <h4 class="title"><a id="id2745174"></a>7.6.3.¬†
  122.       <span lang="en" xml:lang="en">Parameter Settings</span>
  123.     </h4>
  124.             </div>
  125.           </div>
  126.         </div>
  127.         <div class="figure">
  128.           <a id="id2745185"></a>
  129.           <p class="title">
  130.             <b>Figure¬†16.84.¬†
  131.         <span lang="en" xml:lang="en">
  132.           ‚Äú<span class="quote">Supernova</span>‚Äù filter options
  133.         </span>
  134.       </b>
  135.           </p>
  136.           <div class="figure-contents">
  137.             <div class="mediaobject">
  138.               <img src="../images/filters/options-light-nova.png" alt="Supernova filter options" />
  139.             </div>
  140.           </div>
  141.         </div>
  142.         <br class="figure-break" />
  143.         <div class="variablelist">
  144.           <dl>
  145.             <dt>
  146.               <span class="term">Preview</span>
  147.             </dt>
  148.             <dd>
  149.               <p>
  150.             Parameter setting results are interactively displayed in preview.
  151.             Scroll bars allow you to move around the image.
  152.           </p>
  153.             </dd>
  154.             <dt>
  155.               <span class="term">Center of SuperNova</span>
  156.             </dt>
  157.             <dd>
  158.               <div class="itemizedlist">
  159.                 <ul type="disc">
  160.                   <li>
  161.                     <p>
  162.                 <span class="guilabel">X</span>, <span class="guilabel">Y</span>: You can use
  163.                 input boxes to set horizontal (X) and vertical (Y)
  164.                 coordinates of SuperNova center. You can also click the
  165.                 SuperNova center in the <span class="emphasis"><em>preview</em></span> box.
  166.               </p>
  167.                     <div class="tip" style="margin-left: 0.5in; margin-right: 0.5in;">
  168.                       <table border="0" summary="Tip">
  169.                         <tr>
  170.                           <td rowspan="2" align="center" valign="top" width="25">
  171.                             <img alt="[Tip]" src="../images/tip.png" />
  172.                           </td>
  173.                           <th align="left">Tip</th>
  174.                         </tr>
  175.                         <tr>
  176.                           <td align="left" valign="top">
  177.                             <p>
  178.                   To center Supernova precisely, select ‚Äú<span class="quote">Percent</span>‚Äù
  179.                   option in the Unit dropdown list and fix X and Y to 50%.
  180.                 </p>
  181.                           </td>
  182.                         </tr>
  183.                       </table>
  184.                     </div>
  185.                   </li>
  186.                   <li>
  187.                     <p>
  188.                 <span class="guilabel">Show Cursor</span>: This option brings up a
  189.                 reticle in preview, centered on the SuperNova.
  190.               </p>
  191.                   </li>
  192.                 </ul>
  193.               </div>
  194.             </dd>
  195.             <dt>
  196.               <span class="term">Color</span>
  197.             </dt>
  198.             <dd>
  199.               <p>
  200.             When you click on the color swatch, you bring up the usual color
  201.             selector.
  202.           </p>
  203.             </dd>
  204.             <dt>
  205.               <span class="term">Radius</span>
  206.             </dt>
  207.             <dd>
  208.               <p>
  209.             This is radius of the SuperNova center (1-100). When you
  210.             increase the value, you increase the number of central white
  211.             pixels according to r*r (1, 4, 9...).
  212.           </p>
  213.             </dd>
  214.             <dt>
  215.               <span class="term">Spikes</span>
  216.             </dt>
  217.             <dd>
  218.               <p>
  219.             This is number of rays (1-1024).  Each pixel in the nova center
  220.             emit one pixel wide rays. All these rays are more or less
  221.             superimposed resulting in this glittering effect you get when
  222.             you move this slider.
  223.           </p>
  224.             </dd>
  225.             <dt>
  226.               <span class="term">Random Hue</span>
  227.             </dt>
  228.             <dd>
  229.               <p>
  230.             Colours rays at random. (0-360) value seems to be a range in
  231.             HSV color circle.
  232.           </p>
  233.             </dd>
  234.           </dl>
  235.         </div>
  236.       </div>
  237.     </div>
  238.     <div class="navfooter">
  239.       <hr />
  240.       <table width="100%" summary="Navigation footer">
  241.         <tr>
  242.           <td width="40%" align="left"><a accesskey="p" href="plug-in-sparkle.html"><img src="../images/prev.png" alt="Prev" /></a>¬†</td>
  243.           <td width="20%" align="center">
  244.             <a accesskey="u" href="filters-light-and-shadow.html">
  245.               <img src="../images/up.png" alt="Up" />
  246.             </a>
  247.           </td>
  248.           <td width="40%" align="right">¬†<a accesskey="n" href="script-fu-drop-shadow.html"><img src="../images/next.png" alt="Next" /></a></td>
  249.         </tr>
  250.         <tr>
  251.           <td width="40%" align="left" valign="top"><a accesskey="p" href="plug-in-sparkle.html">7.5.¬†
  252.     <span lang="en" xml:lang="en">Sparkle</span>
  253.   </a>¬†</td>
  254.           <td width="20%" align="center">
  255.             <a accesskey="h" href="index.html">
  256.               <img src="../images/home.png" alt="Home" />
  257.             </a>
  258.           </td>
  259.           <td width="40%" align="right" valign="top">¬†<a accesskey="n" href="script-fu-drop-shadow.html">7.7.¬†
  260.     <span lang="en" xml:lang="en">Drop Shadow</span>
  261.   </a></td>
  262.         </tr>
  263.       </table>
  264.     </div>
  265.   </body>
  266. </html>
  267.