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  1. <?xml version="1.0" encoding="UTF-8" standalone="no"?>
  2. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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  4.   <head>
  5.     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
  6.     <title>9.4.┬áLighting Effects</title>
  7.     <link rel="stylesheet" href="gimp-help-plain.css" type="text/css" />
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  10.     <link rel="home" href="index.html" title="GIMP User Manual" />
  11.     <link rel="up" href="ch05s09.html" title="9.┬áLight Effects filters" />
  12.     <link rel="previous" href="ch05s09s03.html" title="9.3.┬áGflare" />
  13.     <link rel="next" href="ch05s09s05.html" title="9.5.┬áSparkle" />
  14.   </head>
  15.   <body>
  16.     <div class="navheader">
  17.       <table width="100%" summary="Navigation header">
  18.         <tr>
  19.           <th colspan="3" align="center">9.4.┬áLighting Effects</th>
  20.         </tr>
  21.         <tr>
  22.           <td width="20%" align="left"><a accesskey="p" href="ch05s09s03.html">Prev</a>┬á</td>
  23.           <th width="60%" align="center">9.┬áLight Effects filters</th>
  24.           <td width="20%" align="right">┬á<a accesskey="n" href="ch05s09s05.html">Next</a></td>
  25.         </tr>
  26.       </table>
  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_effects"></a>9.4.┬áLighting Effects</h3>
  34.           </div>
  35.         </div>
  36.         <div></div>
  37.       </div>
  38.       <a id="id2978060" class="indexterm"></a>
  39.       <div class="mediaobject">
  40.         <img src="../images/filters/filters-light-lightingeffects.png" />
  41.       </div>
  42.       <div class="simplesect" lang="en" xml:lang="en">
  43.         <div class="titlepage">
  44.           <div>
  45.             <div>
  46.               <h4 class="title"><a id="id2978082"></a>Overview</h4>
  47.             </div>
  48.           </div>
  49.           <div></div>
  50.         </div>
  51.         <p>
  52.       This filter is found in 
  53.       <span class="guimenuitem">Image>Filters/Light Effects/<span class="accel">L</span>ighting Effects</span>.
  54.     </p>
  55.         <p>
  56.       Gflare effect reminds the effect you get when you light up a wall with a spot. It doesn't 
  57.       produce any drop shadows and, of course, doesn't reveal any new details in dark zones.
  58.     </p>
  59.       </div>
  60.       <div class="simplesect" lang="en" xml:lang="en">
  61.         <div class="titlepage">
  62.           <div>
  63.             <div>
  64.               <h4 class="title"><a id="id2978114"></a>Preview</h4>
  65.             </div>
  66.           </div>
  67.           <div></div>
  68.         </div>
  69.         <dt></dt>
  70.         <dd>
  71.           <p>
  72.           When <span class="guilabel">Interactive</span> is checked, parameter setting results are 
  73.           interactively displayed in preview without modifying the image until you click on 
  74.           <span class="guilabel">OK</span> button.
  75.         </p>
  76.           <p>
  77.           If "Interactive" is not checked, changes are displayed in preview only when you click 
  78.           on the <span class="guilabel">Update</span> button. This option is useful with a slow computer.
  79.         </p>
  80.         </dd>
  81.       </div>
  82.       <div class="simplesect" lang="en" xml:lang="en">
  83.         <div class="titlepage">
  84.           <div>
  85.             <div>
  86.               <h4 class="title"><a id="id2978158"></a>General Options</h4>
  87.             </div>
  88.           </div>
  89.           <div></div>
  90.         </div>
  91.         <div class="itemizedlist">
  92.           <ul type="disc">
  93.             <li>
  94.               <p>
  95.           <span class="guilabel">Transparent Background</span>: Makes destination image transparent when 
  96.           bumpmap height is zero (height is zero in black areas of the bumpmapped image).
  97.         </p>
  98.               <p>
  99.           <span class="guilabel">Create New Image</span>: Creates a new image when applying filter.
  100.         </p>
  101.               <p>
  102.           <span class="guilabel">High Quality Preview</span>: For quick CPU...
  103.         </p>
  104.               <p>
  105.           <span class="guilabel">Enable Antialiasing</span>: Lowers the scale effect on lines.
  106.           <span class="emphasis"><em>Depth</em></span> is the strength of antialiasing. <span class="emphasis"><em>Threshold</em></span> 
  107.           determines which transitions will be considered as a border. High values will limit 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="id2978222"></a>Light</h4>
  119.             </div>
  120.           </div>
  121.           <div></div>
  122.         </div>
  123.         <dt>
  124.           <span class="term">Light Settings</span>
  125.         </dt>
  126.         <dd>
  127.           <p>
  128.             <span class="guilabel">Light Type</span>: Three types are available. <span class="emphasis"><em>Point</em></span> 
  129.             displays a blue point at center of preview. You can click and drag it to move light all 
  130.             over the preview. <span class="emphasis"><em>Directional</em></span>: the blue point is linked to preview 
  131.             center by a line which indicates direction of light. The white light halo has an 
  132.             elliptic shape. <span class="emphasis"><em>None</em></span>: there is no blue point. Light comes from the 
  133.             top left corner, the best to give a good relief effect.
  134.           </p>
  135.           <p>
  136.             <span class="guilabel">Light Source Color</span>: When you click on the color dwell, you bring a 
  137.             dialog up where you can select the light source color. 
  138.           </p>
  139.           <p>
  140.             <span class="guilabel">Position</span>: Determines the light point position according to three 
  141.             coordinates: X coordinate for horizontal position, Y for vertical position, Z for source 
  142.             distance (the light darkens when distance increases). Values are from -1 to +1.
  143.           </p>
  144.         </dd>
  145.       </div>
  146.       <div class="simplesect" lang="en" xml:lang="en">
  147.         <div class="titlepage">
  148.           <div>
  149.             <div>
  150.               <h4 class="title"><a id="id2978293"></a>Material</h4>
  151.             </div>
  152.           </div>
  153.           <div></div>
  154.         </div>
  155.         <dt>
  156.           <span class="term">Intensity Levels</span>
  157.         </dt>
  158.         <dd>
  159.           <p>
  160.             These options don't concern light itself, but light reflected by objects.
  161.           </p>
  162.           <p>
  163.             <span class="guilabel">Ambient</span>: Sets the ambient light, i.e the indirect light which 
  164.             lightens all the scene out of the light spot 
  165.           </p>
  166.           <p>
  167.             <span class="guilabel">Diffuse</span>: When you increase this value, light progressively diffuses 
  168.             to the whole image
  169.           </p>
  170.         </dd>
  171.         <dt>
  172.           <span class="term">Reflectivity</span>
  173.         </dt>
  174.         <dd>
  175.           <p>
  176.             <span class="guilabel">Diffuse</span>: Higher values make the object reflect more light.
  177.           </p>
  178.           <p>
  179.             <span class="guilabel">Specular</span>: Controls how intense will be the highlights.
  180.           </p>
  181.           <p>
  182.             <span class="guilabel">Highlights</span>: Higher values make the highlights more focused.
  183.           </p>
  184.         </dd>
  185.       </div>
  186.       <div class="simplesect" lang="en" xml:lang="en">
  187.         <div class="titlepage">
  188.           <div>
  189.             <div>
  190.               <h4 class="title"><a id="id2978378"></a>Bump Map</h4>
  191.             </div>
  192.           </div>
  193.           <div></div>
  194.         </div>
  195.         <dt>
  196.           <span class="term">Enable Bump Mapping</span>
  197.         </dt>
  198.         <dd>
  199.           <p>
  200.           Combined with "Environment Map", this option allows interesting bump mapping. Only 
  201.           greyscale images can be used for bumpmaps (light areas are bumped, dark areas remain 
  202.           unchanged). So, if you want to bumpmap against a RGB image, you have to turn it to 
  203.           greyscale first (<Image>Image/Mode/Grayscale). When you check this box, following 
  204.           options are enabled:
  205.         </p>
  206.           <div class="itemizedlist">
  207.             <p>
  208.             <span class="guilabel">Bump Map Image</span>: You have to select there the greyscale image.
  209.           </p>
  210.             <p>
  211.             <span class="guilabel">Curve</span>: Four curve types are available: <span class="emphasis"><em>Linear</em></span>, 
  212.             <span class="emphasis"><em>Logarithmic</em></span>, <span class="emphasis"><em>Sinusoidal</em></span> and 
  213.             <span class="emphasis"><em>Spherical</em></span>. See Bump Map plug-in for explanations.
  214.                
  215.           </p>
  216.             <p>
  217.             <span class="guilabel">Maximum Height</span>: This is the maximum height of bumps.
  218.           </p>
  219.             <p>
  220.             <span class="guilabel">Minimum Height</span>: This is the minimum height of bumps.
  221.           </p>
  222.             <p>
  223.             <span class="guilabel">Autostretch to fit Value Range</span>: There is correspondence between 
  224.             grey level and height. If difference between black and lightest grey is not enough to 
  225.             fill the height value range determined above, then values are stretched.
  226.           </p>
  227.             <ul type="disc"></ul>
  228.           </div>
  229.         </dd>
  230.       </div>
  231.       <div class="simplesect" lang="en" xml:lang="en">
  232.         <div class="titlepage">
  233.           <div>
  234.             <div>
  235.               <h4 class="title"><a id="id2978480"></a>Environment Map</h4>
  236.             </div>
  237.           </div>
  238.           <div></div>
  239.         </div>
  240.         <dt>
  241.           <span class="term">Enable Environment Mapping</span>
  242.         </dt>
  243.         <dd>
  244.           <p>
  245.           When you check this box, the following option is enabled:
  246.         </p>
  247.           <div class="itemizedlist">
  248.             <p>
  249.             <span class="guilabel">Environment Image</span>: You have to select there a RGB image.
  250.           </p>
  251.             <ul type="disc"></ul>
  252.           </div>
  253.         </dd>
  254.       </div>
  255.     </div>
  256.     <div class="navfooter">
  257.       <hr />
  258.       <table width="100%" summary="Navigation footer">
  259.         <tr>
  260.           <td width="40%" align="left"><a accesskey="p" href="ch05s09s03.html">Prev</a>┬á</td>
  261.           <td width="20%" align="center">
  262.             <a accesskey="u" href="ch05s09.html">Up</a>
  263.           </td>
  264.           <td width="40%" align="right">┬á<a accesskey="n" href="ch05s09s05.html">Next</a></td>
  265.         </tr>
  266.         <tr>
  267.           <td width="40%" align="left" valign="top">9.3.┬áGflare┬á</td>
  268.           <td width="20%" align="center">
  269.             <a accesskey="h" href="index.html">Home</a>
  270.           </td>
  271.           <td width="40%" align="right" valign="top">┬á9.5.┬áSparkle</td>
  272.         </tr>
  273.       </table>
  274.     </div>
  275.   </body>
  276. </html>
  277.