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  6.     <title>9.5.┬áSparkle</title>
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  19.           <th colspan="3" align="center" id="chaptername">9.┬áLight Effects filters</th>
  20.         </tr>
  21.         <tr>
  22.           <td width="20%" align="left"><a accesskey="p" href="ch06s09s04.html">Prev</a>┬á</td>
  23.           <th width="60%" align="center" id="sectionname">9.5.┬áSparkle</th>
  24.           <td width="20%" align="right">┬á<a accesskey="n" href="ch06s09s06.html">Next</a></td>
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  31.         <div>
  32.           <div>
  33.             <h3 class="title"><a id="plug-in-sparkle"></a>9.5.┬áSparkle</h3>
  34.           </div>
  35.         </div>
  36.       </div>
  37.       <a id="id3482471" class="indexterm"></a>
  38.       <div class="mediaobject">
  39.         <img src="../images/filters/filters-light-sparkle.png" />
  40.       </div>
  41.       <div class="simplesect" lang="en" xml:lang="en">
  42.         <div class="titlepage">
  43.           <div>
  44.             <div>
  45.               <h4 class="title"><a id="id3482492"></a>Overview</h4>
  46.             </div>
  47.           </div>
  48.         </div>
  49.         <p>
  50.       This filter is found in 
  51.       <span class="guimenuitem">Image>Filters/Light Effects/Sparkle</span>.
  52.     </p>
  53.         <p>
  54.       This filter adds sparkles to your image. It uses the lightest points according to a threshold 
  55.       you have determined. It is difficult to foresee where sparkles will appear. But you can put 
  56.       white points on your image where you want sparkles to be.
  57.     </p>
  58.       </div>
  59.       <div class="simplesect" lang="en" xml:lang="en">
  60.         <div class="titlepage">
  61.           <div>
  62.             <div>
  63.               <h4 class="title"><a id="id3482521"></a>Parameter Settings</h4>
  64.             </div>
  65.           </div>
  66.         </div>
  67.         <p>
  68.       Sliders and input boxes allow you to set values.
  69.     </p>
  70.         <div class="variablelist">
  71.           <dl>
  72.             <dt>
  73.               <span class="term">Luminosity Threshold</span>
  74.             </dt>
  75.             <dd>
  76.               <p>
  77.             The higher the threshold, the more areas are concerned by sparkling (0.0-0.1).
  78.           </p>
  79.             </dd>
  80.             <dt>
  81.               <span class="term">Flare Intensity</span>
  82.             </dt>
  83.             <dd>
  84.               <p>
  85.             When this value increases, the central spot and rays widen (0.0-1.0).
  86.           </p>
  87.             </dd>
  88.             <dt>
  89.               <span class="term">Spike Length</span>
  90.             </dt>
  91.             <dd>
  92.               <p>
  93.             This is ray length (1-100). When you reduce it, small spikes decrease first.
  94.           </p>
  95.             </dd>
  96.             <dt>
  97.               <span class="term">Spike Points</span>
  98.             </dt>
  99.             <dd>
  100.               <p>
  101.             Number of starting points for spikes (0-16). It's the number of big spikes. There is the same 
  102.             number of small spikes. When number is odd, small spikes are opposite the big ones. When number 
  103.             is even, big spikes are opposite another big spike. 
  104.           </p>
  105.             </dd>
  106.             <dt>
  107.               <span class="term">Spike Angle</span>
  108.             </dt>
  109.             <dd>
  110.               <p>
  111.             This is angle of first big spike with horizontal (-1 +360). -1 determines this value at random. 
  112.             If a spot has several pixels within required threshold, each of them will generate a sparkle.
  113.             If angle is positive, they will all be superimposed. With -1, each sparkle will have a random 
  114.             rotation resulting in numerous thin spikes. 
  115.           </p>
  116.             </dd>
  117.             <dt>
  118.               <span class="term">Spike Density</span>
  119.             </dt>
  120.             <dd>
  121.               <p>
  122.             This option determines the number of sparkles on your image. It indicates the percentage 
  123.             (0.0-1.0) of all possible sparkles that will be preserved.  
  124.           </p>
  125.             </dd>
  126.             <dt>
  127.               <span class="term">Opacity</span>
  128.             </dt>
  129.             <dd>
  130.               <p>
  131.             When you decrease Opacity (0.0-1.0), sparkles become more transparent and the layer beneath 
  132.             becomes visible. If there is no other layer, sparkle saturation decreases.
  133.           </p>
  134.             </dd>
  135.             <dt>
  136.               <span class="term">Random Hue</span>
  137.             </dt>
  138.             <dd>
  139.               <p>
  140.             This option should change sparkle hue at random... (0.0-1.0)
  141.           </p>
  142.             </dd>
  143.             <dt>
  144.               <span class="term">Random Saturation</span>
  145.             </dt>
  146.             <dd>
  147.               <p>
  148.             This option should change sparkle saturation at random... (0.0-1.0)
  149.           </p>
  150.             </dd>
  151.             <dt>
  152.               <span class="term">Preserve Luminosity</span>
  153.             </dt>
  154.             <dd>
  155.               <p>
  156.             Gives to all central pixels the luminosity of the brightest pixel, resulting in increasing 
  157.             the whole sparkle luminosity.
  158.           </p>
  159.             </dd>
  160.             <dt>
  161.               <span class="term">Inverse</span>
  162.             </dt>
  163.             <dd>
  164.               <p>
  165.             Instead of selecting brightest pixels in image, Sparkle will select the darkest ones, resulting 
  166.             in dark sparkles.
  167.           </p>
  168.             </dd>
  169.             <dt>
  170.               <span class="term">Add Border</span>
  171.             </dt>
  172.             <dd>
  173.               <p>
  174.             Instead of creating sparkles on brightest pixels, this option creates an image border made up of 
  175.             numerous sparkles.
  176.           </p>
  177.             </dd>
  178.             <dt>
  179.               <span class="term">Colors</span>
  180.             </dt>
  181.             <dd>
  182.               <p>
  183.             You can change there the color of central pixels. This color will be added in Screen mode 
  184.             (Multiply if Inverse is checked).
  185.           </p>
  186.             </dd>
  187.           </dl>
  188.         </div>
  189.       </div>
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  195.           <td width="40%" align="left"><a accesskey="p" href="ch06s09s04.html">Prev</a>┬á</td>
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  202.           <td width="40%" align="left" valign="top">9.4.┬áLighting Effects┬á</td>
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