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  1. <?xml version="1.0" encoding="UTF-8" standalone="no"?>
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  6.     <title>10.2.¬† Bump Map</title>
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  12.     <link rel="start" href="index.html" title="GNU Image Manipulation Program" />
  13.     <link rel="up" href="filters-map.html" title="10.¬† Map Filters" />
  14.     <link rel="prev" href="filters-map.html" title="10.¬† Map Filters" />
  15.     <link rel="next" href="plug-in-displace.html" title="10.3.¬† Displace" />
  16.   </head>
  17.   <body>
  18.     <div class="navheader">
  19.       <table width="100%" summary="Navigation header">
  20.         <tr>
  21.           <th colspan="3" align="center">10.2.¬†
  22.     <span lang="en" xml:lang="en">Bump Map</span>
  23.   </th>
  24.         </tr>
  25.         <tr>
  26.           <td width="20%" align="left"><a accesskey="p" href="filters-map.html"><img src="../images/prev.png" alt="Prev" /></a>¬†</td>
  27.           <th width="60%" align="center">10.¬†
  28.     <span lang="en" xml:lang="en">Map Filters</span>
  29.   </th>
  30.           <td width="20%" align="right">¬†<a accesskey="n" href="plug-in-displace.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-bump-map"></a>10.2.¬†
  40.     <span lang="en" xml:lang="en">Bump 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: 2439 $</td>
  53.                   <td align="left">2008-01-09</td>
  54.                   <td align="left">ude</td>
  55.                 </tr>
  56.               </table>
  57.             </div>
  58.           </div>
  59.         </div>
  60.       </div>
  61.       <a id="id2763199" class="indexterm"></a>
  62.       <a id="id2763217" 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="id2763226"></a>10.2.1.¬†
  68.       <span lang="en" xml:lang="en">Overview</span>
  69.     </h4>
  70.             </div>
  71.           </div>
  72.         </div>
  73.         <div class="figure">
  74.           <a id="id2763237"></a>
  75.           <p class="title">
  76.             <b>Figure¬†16.197.¬†
  77.         <span lang="en" xml:lang="en">
  78.           ‚Äú<span class="quote">bump-map</span>‚Äù example
  79.         </span>
  80.       </b>
  81.           </p>
  82.           <div class="figure-contents">
  83.             <div class="mediaobject">
  84.               <img src="../images/filters/examples/example-map-bumpmap.png" alt="bump-map example" />
  85.               <div class="caption">
  86.                 <p>
  87.             On the left, the original image that we want to emboss: a solid
  88.             blue. In the middle, the bump map : a grayscale image, where
  89.             black pixels will emboss backwards and white pixels will emboss
  90.             forwards. On the right, the bump-mapped image. The filter adds a
  91.             shadow effect.
  92.           </p>
  93.               </div>
  94.             </div>
  95.           </div>
  96.         </div>
  97.         <br class="figure-break" />
  98.         <p>
  99.       You can find this filter through
  100.       <span class="guimenu">Filters</span> ‚Üí <span class="guisubmenu">Map</span> ‚Üí <span class="guimenuitem"><span class="accel">B</span>ump Map</span>.
  101.     </p>
  102.         <p>
  103.       This filter creates a 3D effect by embossing an image (the card) and
  104.       then mapping it to another image. Bump height depends on pixel
  105.       luminosity and you can set light direction. See
  106.       <a class="link" href="plug-in-emboss.html" title="8.9.¬† Emboss">Emboss</a> for more information
  107.       about embossing. You can bump map any type of image, unlike the Emboss
  108.       filter.
  109.     </p>
  110.       </div>
  111.       <div class="sect3" lang="en" xml:lang="en">
  112.         <div class="titlepage">
  113.           <div>
  114.             <div>
  115.               <h4 class="title"><a id="id2763337"></a>10.2.2.¬†
  116.       <span lang="en" xml:lang="en">Options</span>
  117.     </h4>
  118.             </div>
  119.           </div>
  120.         </div>
  121.         <div class="figure">
  122.           <a id="id2763350"></a>
  123.           <p class="title">
  124.             <b>Figure¬†16.198.¬†
  125.         <span lang="en" xml:lang="en">
  126.           ‚Äú<span class="quote">Bump Map</span>‚Äù filter options
  127.         </span>
  128.       </b>
  129.           </p>
  130.           <div class="figure-contents">
  131.             <div class="mediaobject">
  132.               <img src="../images/filters/options-map-bumpmap.png" alt="Bump Map filter options" />
  133.             </div>
  134.           </div>
  135.         </div>
  136.         <br class="figure-break" />
  137.         <div class="variablelist">
  138.           <dl>
  139.             <dt>
  140.               <span class="term">Preview</span>
  141.             </dt>
  142.             <dd>
  143.               <p>
  144.             Parameter setting results are interactively displayed in preview.
  145.             Scroll bars allow you to move around the image.
  146.           </p>
  147.             </dd>
  148.             <dt>
  149.               <span class="term">
  150.           <span lang="en" xml:lang="en">Bump Map</span>
  151.         </span>
  152.             </dt>
  153.             <dd>
  154.               <p>
  155.             This drop-down list allows you to select the image that will be
  156.             used as a map for bump-mapping. This list contains images that are
  157.             present on your screen when you launch the filter. Images opened
  158.             after starting filter are not present in this list.
  159.           </p>
  160.             </dd>
  161.             <dt>
  162.               <span class="term">
  163.           <span lang="en" xml:lang="en">Map Type</span>
  164.         </span>
  165.             </dt>
  166.             <dd>
  167.               <p>
  168.             This option allows you to define the method that will be used
  169.             when creating the map image:
  170.           </p>
  171.               <div class="itemizedlist">
  172.                 <ul type="disc">
  173.                   <li>
  174.                     <p>
  175.                 <span class="guilabel">Linear</span>: bump height is a direct
  176.                 function of luminosity.
  177.               </p>
  178.                   </li>
  179.                   <li>
  180.                     <p>
  181.                 <span class="guilabel">Sinusoidal</span>: bump height
  182.                 is a sinusoidal function of luminosity.
  183.               </p>
  184.                   </li>
  185.                   <li>
  186.                     <p>
  187.                 <span class="guilabel">Spheric</span>: bump height is
  188.                 a spheric function of luminosity.
  189.               </p>
  190.                   </li>
  191.                 </ul>
  192.               </div>
  193.             </dd>
  194.             <dt>
  195.               <span class="term">
  196.           <span lang="en" xml:lang="en">Compensate for darkening</span>
  197.         </span>
  198.             </dt>
  199.             <dd>
  200.               <p>
  201.             Bump-mapping tends to darken image. You can compensate this
  202.             darkening by checking this option.
  203.           </p>
  204.             </dd>
  205.             <dt>
  206.               <span class="term">
  207.           <span lang="en" xml:lang="en">Invert bump-map</span>
  208.         </span>
  209.             </dt>
  210.             <dd>
  211.               <p>
  212.             Bright pixels default to bumps and dark pixels to hollows. You can
  213.             invert this effect by checking this option.
  214.           </p>
  215.             </dd>
  216.             <dt>
  217.               <span class="term">
  218.           <span lang="en" xml:lang="en">Tile bump-map</span>
  219.         </span>
  220.             </dt>
  221.             <dd>
  222.               <p>
  223.             If you check this option, there will be no relief break if
  224.             you use your image as a pattern for a web page: patterns will
  225.             be placed side by side without any visible joins.
  226.           </p>
  227.             </dd>
  228.             <dt>
  229.               <span class="term">
  230.           <span lang="en" xml:lang="en">Azimut</span>
  231.         </span>
  232.             </dt>
  233.             <dd>
  234.               <p>
  235.             This is about lighting according to the points of the compass
  236.             (0 - 360). East (0¬∞) is on the left. Increasing value goes
  237.             counter-clockwise.
  238.           </p>
  239.             </dd>
  240.             <dt>
  241.               <span class="term">
  242.           <span lang="en" xml:lang="en">Elevation</span>
  243.         </span>
  244.             </dt>
  245.             <dd>
  246.               <p>
  247.             That's height from horizon (0.50¬∞), up to zenith (90¬∞).
  248.           </p>
  249.             </dd>
  250.             <dt>
  251.               <span class="term">
  252.           <span lang="en" xml:lang="en">Depth</span>
  253.         </span>
  254.             </dt>
  255.             <dd>
  256.               <p>
  257.             With this slider, you can vary bump height and hollow depth. The
  258.             higher the value, the higher the difference between both. Values
  259.             vary from 1 to 65.
  260.           </p>
  261.             </dd>
  262.             <dt>
  263.               <span class="term">
  264.           <span lang="en" xml:lang="en">X/Y offsets</span>
  265.         </span>
  266.             </dt>
  267.             <dd>
  268.               <p>
  269.             With this slider, you can adjust the map image position
  270.             compared with the image, horizontally (X) and/or vertically
  271.             (Y).
  272.           </p>
  273.             </dd>
  274.             <dt>
  275.               <span class="term">
  276.           <span lang="en" xml:lang="en">Sea Level</span>
  277.         </span>
  278.             </dt>
  279.             <dd>
  280.               <p>
  281.             If your image has transparent areas, they will be treated like
  282.             dark areas and will appear as hollows after bump-mapping. With this
  283.             slider, you can reduce hollows as if sea level was raising. This
  284.             hollows will disappear when sea level value reaches 255. If the
  285.             Invert bump-map option is checked, transparent areas will be
  286.             treated as bright areas, and then Sea Level slider will plane
  287.             bumps down.
  288.           </p>
  289.             </dd>
  290.             <dt>
  291.               <span class="term">
  292.           <span lang="en" xml:lang="en">Ambient</span>
  293.         </span>
  294.             </dt>
  295.             <dd>
  296.               <p>
  297.             This slider controls the intensity of ambient light. With high
  298.             values, shadows will fade and relief lessen.
  299.           </p>
  300.             </dd>
  301.           </dl>
  302.         </div>
  303.       </div>
  304.     </div>
  305.     <div class="navfooter">
  306.       <hr />
  307.       <table width="100%" summary="Navigation footer">
  308.         <tr>
  309.           <td width="40%" align="left"><a accesskey="p" href="filters-map.html"><img src="../images/prev.png" alt="Prev" /></a>¬†</td>
  310.           <td width="20%" align="center">
  311.             <a accesskey="u" href="filters-map.html">
  312.               <img src="../images/up.png" alt="Up" />
  313.             </a>
  314.           </td>
  315.           <td width="40%" align="right">¬†<a accesskey="n" href="plug-in-displace.html"><img src="../images/next.png" alt="Next" /></a></td>
  316.         </tr>
  317.         <tr>
  318.           <td width="40%" align="left" valign="top"><a accesskey="p" href="filters-map.html">10.¬†
  319.     <span lang="en" xml:lang="en">Map Filters</span>
  320.   </a>¬†</td>
  321.           <td width="20%" align="center">
  322.             <a accesskey="h" href="index.html">
  323.               <img src="../images/home.png" alt="Home" />
  324.             </a>
  325.           </td>
  326.           <td width="40%" align="right" valign="top">¬†<a accesskey="n" href="plug-in-displace.html">10.3.¬†
  327.     <span lang="en" xml:lang="en">Displace</span>
  328.   </a></td>
  329.         </tr>
  330.       </table>
  331.     </div>
  332.   </body>
  333. </html>
  334.