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  6.     <title>9.4.┬áLighting Effects</title>
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  18.         <tr>
  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="ch06s09s03.html">Prev</a>┬á</td>
  23.           <th width="60%" align="center" id="sectionname">9.4.┬áLighting Effects</th>
  24.           <td width="20%" align="right">┬á<a accesskey="n" href="ch06s09s05.html">Next</a></td>
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  27.       <hr />
  28.     </div>
  29.     <div class="sect2" lang="en" xml:lang="en">
  30.       <div class="titlepage">
  31.         <div>
  32.           <div>
  33.             <h3 class="title"><a id="plug-in-lighting"></a>9.4.┬áLighting Effects</h3>
  34.           </div>
  35.         </div>
  36.       </div>
  37.       <a id="id3481986" class="indexterm"></a>
  38.       <div class="mediaobject">
  39.         <img src="../images/filters/filters-light-lightingeffects.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="id3482008"></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/<span class="accel">L</span>ighting Effects</span>.
  52.     </p>
  53.         <p>
  54.       This filter simulates the effect you get when you light up a wall with a spot. It doesn't 
  55.       produce any drop shadows and, of course, doesn't reveal any new details in dark zones.
  56.     </p>
  57.       </div>
  58.       <div class="simplesect" lang="en" xml:lang="en">
  59.         <div class="titlepage">
  60.           <div>
  61.             <div>
  62.               <h4 class="title"><a id="id3482039"></a>Preview</h4>
  63.             </div>
  64.           </div>
  65.         </div>
  66.         <p>
  67.           When <span class="guilabel">Interactive</span> is checked, parameter setting results are 
  68.           interactively displayed in preview without modifying the image until you click on 
  69.           <span class="guilabel">OK</span> button.
  70.         </p>
  71.         <p>
  72.           If "Interactive" is not checked, changes are displayed in preview only when you click 
  73.           on the <span class="guilabel">Update</span> button. This option is useful with a slow computer.
  74.         </p>
  75.       </div>
  76.       <div class="simplesect" lang="en" xml:lang="en">
  77.         <div class="titlepage">
  78.           <div>
  79.             <div>
  80.               <h4 class="title"><a id="id3482081"></a>General Options</h4>
  81.             </div>
  82.           </div>
  83.         </div>
  84.         <div class="itemizedlist">
  85.           <ul type="disc">
  86.             <li>
  87.               <p>
  88.           <span class="guilabel">Transparent Background</span>: Makes destination image transparent when 
  89.           bumpmap height is zero (height is zero in black areas of the bumpmapped image).
  90.         </p>
  91.             </li>
  92.             <li>
  93.               <p>
  94.           <span class="guilabel">Create New Image</span>: Creates a new image when applying filter.
  95.         </p>
  96.             </li>
  97.             <li>
  98.               <p>
  99.           <span class="guilabel">High Quality Preview</span>: For quick CPU...
  100.         </p>
  101.             </li>
  102.             <li>
  103.               <p>
  104.           <span class="guilabel">Enable Antialiasing</span>: Lowers the scale effect on lines.
  105.           <span class="emphasis"><em>Depth</em></span> is the strength of antialiasing. 
  106.           <span class="emphasis"><em>Threshold</em></span> determines which transitions will be 
  107.           considered as a border. High values will limit the effect 
  108.           to strong transitions. 
  109.         </p>
  110.             </li>
  111.           </ul>
  112.         </div>
  113.       </div>
  114.       <div class="simplesect" lang="en" xml:lang="en">
  115.         <div class="titlepage">
  116.           <div>
  117.             <div>
  118.               <h4 class="title"><a id="id3482150"></a>Light</h4>
  119.             </div>
  120.           </div>
  121.         </div>
  122.         <div class="variablelist">
  123.           <dl>
  124.             <dt>
  125.               <span class="term">Light Settings</span>
  126.             </dt>
  127.             <dd>
  128.               <p>
  129.             <span class="guilabel">Light Type</span>: Three types are available. 
  130.             <span class="emphasis"><em>Point</em></span> 
  131.             displays a blue point at center of preview. You can click and 
  132.             drag it to move light all 
  133.             over the preview. <span class="emphasis"><em>Directional</em></span>: the blue point 
  134.             is linked to preview 
  135.             center by a line which indicates direction of light. The white light halo has an 
  136.             elliptic shape. <span class="emphasis"><em>None</em></span>: there is no blue point. Light comes 
  137.             from the top left corner, the best to give a good relief effect.
  138.           </p>
  139.               <p>
  140.             <span class="guilabel">Light Source Color</span>: When you click on the color dwell, 
  141.             you bring a 
  142.             dialog up where you can select the light source color. 
  143.           </p>
  144.               <p>
  145.             <span class="guilabel">Position</span>: Determines the light point position 
  146.             according to three coordinates: X coordinate for horizontal position, 
  147.             Y for vertical position, Z for source 
  148.             distance (the light darkens when distance increases). Values are from -1 to +1.
  149.           </p>
  150.             </dd>
  151.           </dl>
  152.         </div>
  153.       </div>
  154.       <div class="simplesect" lang="en" xml:lang="en">
  155.         <div class="titlepage">
  156.           <div>
  157.             <div>
  158.               <h4 class="title"><a id="id3482223"></a>Material</h4>
  159.             </div>
  160.           </div>
  161.         </div>
  162.         <div class="variablelist">
  163.           <dl>
  164.             <dt>
  165.               <span class="term">Intensity Levels</span>
  166.             </dt>
  167.             <dd>
  168.               <p>
  169.             These options don't concern light itself, but light reflected by objects.
  170.           </p>
  171.               <p>
  172.             <span class="guilabel">Ambient</span>: Sets the ambient light, i.e the indirect light which 
  173.             lightens all the scene out of the light spot 
  174.           </p>
  175.               <p>
  176.             <span class="guilabel">Diffuse</span>: When you increase this value, 
  177.             light progressively diffuses to the whole image
  178.           </p>
  179.             </dd>
  180.             <dt>
  181.               <span class="term">Reflectivity</span>
  182.             </dt>
  183.             <dd>
  184.               <p>
  185.             <span class="guilabel">Diffuse</span>: Higher values make the object reflect more light.
  186.           </p>
  187.               <p>
  188.             <span class="guilabel">Specular</span>: Controls how intense will be the highlights.
  189.           </p>
  190.               <p>
  191.             <span class="guilabel">Highlights</span>: Higher values make the highlights more focused.
  192.           </p>
  193.             </dd>
  194.           </dl>
  195.         </div>
  196.       </div>
  197.       <div class="simplesect" lang="en" xml:lang="en">
  198.         <div class="titlepage">
  199.           <div>
  200.             <div>
  201.               <h4 class="title"><a id="id3482309"></a>Bump Map</h4>
  202.             </div>
  203.           </div>
  204.         </div>
  205.         <div class="variablelist">
  206.           <dl>
  207.             <dt>
  208.               <span class="term">Enable Bump Mapping</span>
  209.             </dt>
  210.             <dd>
  211.               <p>
  212.           Combined with "Environment Map", this option allows interesting bump mapping. Only 
  213.           greyscale images can be used for bumpmaps (light areas are bumped, dark areas remain 
  214.           unchanged). So, if you want to bumpmap against a RGB image, you have to turn it to 
  215.           greyscale first (<Image>Image/Mode/Grayscale). When you check this box, following 
  216.           options are enabled:
  217.         </p>
  218.               <div class="itemizedlist">
  219.                 <ul type="disc">
  220.                   <li>
  221.                     <p>
  222.             <span class="guilabel">Bump Map Image</span>: You have to select there the greyscale image.
  223.             </p>
  224.                   </li>
  225.                   <li>
  226.                     <p>
  227.               <span class="guilabel">Curve</span>: Four curve types are available: 
  228.                <span class="emphasis"><em>Linear</em></span>, 
  229.                <span class="emphasis"><em>Logarithmic</em></span>, <span class="emphasis"><em>Sinusoidal</em></span> and 
  230.                <span class="emphasis"><em>Spherical</em></span>. See Bump Map plug-in for explanations.
  231.                
  232.             </p>
  233.                   </li>
  234.                   <li>
  235.                     <p>
  236.               <span class="guilabel">Maximum Height</span>: This is the maximum height of bumps.
  237.             </p>
  238.                   </li>
  239.                   <li>
  240.                     <p>
  241.               <span class="guilabel">Minimum Height</span>: This is the minimum height of bumps.
  242.             </p>
  243.                   </li>
  244.                   <li>
  245.                     <p>
  246.               <span class="guilabel">Autostretch to fit Value Range</span>: There is correspondence 
  247.               between grey level and height. If difference between black and lightest 
  248.               grey is not enough to 
  249.               fill the height value range determined above, then values are stretched.
  250.             </p>
  251.                   </li>
  252.                 </ul>
  253.               </div>
  254.             </dd>
  255.           </dl>
  256.         </div>
  257.       </div>
  258.       <div class="simplesect" lang="en" xml:lang="en">
  259.         <div class="titlepage">
  260.           <div>
  261.             <div>
  262.               <h4 class="title"><a id="id3482420"></a>Environment Map</h4>
  263.             </div>
  264.           </div>
  265.         </div>
  266.         <div class="variablelist">
  267.           <dl>
  268.             <dt>
  269.               <span class="term">Enable Environment Mapping</span>
  270.             </dt>
  271.             <dd>
  272.               <p>
  273.           When you check this box, the following option is enabled:
  274.         </p>
  275.               <div class="itemizedlist">
  276.                 <ul type="disc">
  277.                   <li>
  278.                     <p>
  279.               <span class="guilabel">Environment Image</span>: You have to select there a RGB image.
  280.             </p>
  281.                   </li>
  282.                 </ul>
  283.               </div>
  284.             </dd>
  285.           </dl>
  286.         </div>
  287.       </div>
  288.     </div>
  289.     <div class="navfooter">
  290.       <hr />
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  292.         <tr>
  293.           <td width="40%" align="left"><a accesskey="p" href="ch06s09s03.html">Prev</a>┬á</td>
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  302.             <a accesskey="h" href="index.html">Home</a>
  303.           </td>
  304.           <td width="40%" align="right" valign="top">┬á9.5.┬áSparkle</td>
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  309. </html>
  310.