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  6.     <title>9.10.¬† Van Gogh (LIC)</title>
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  20.         <tr>
  21.           <th colspan="3" align="center">9.10.¬†
  22.     <span lang="en" xml:lang="en">Van Gogh (LIC)</span>
  23.   </th>
  24.         </tr>
  25.         <tr>
  26.           <td width="20%" align="left"><a accesskey="p" href="script-fu-predator.html"><img src="../images/prev.png" alt="Prev" /></a>¬†</td>
  27.           <th width="60%" align="center">9.¬†
  28.     <span lang="en" xml:lang="en">Artistic Filters</span>
  29.   </th>
  30.           <td width="20%" align="right">¬†<a accesskey="n" href="plug-in-softglow.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-lic"></a>9.10.¬†
  40.     <span lang="en" xml:lang="en">Van Gogh (LIC)</span>
  41.   </h3>
  42.           </div>
  43.         </div>
  44.       </div>
  45.       <a id="id2761669" class="indexterm"></a>
  46.       <a id="id2761686" class="indexterm"></a>
  47.       <div class="sect3" lang="en" xml:lang="en">
  48.         <div class="titlepage">
  49.           <div>
  50.             <div>
  51.               <h4 class="title"><a id="id2761695"></a>9.10.1.¬†
  52.       <span lang="en" xml:lang="en">Overview</span>
  53.     </h4>
  54.             </div>
  55.           </div>
  56.         </div>
  57.         <div class="figure">
  58.           <a id="id2761706"></a>
  59.           <p class="title">
  60.             <b>Figure¬†16.182.¬†
  61.         <span lang="en" xml:lang="en">
  62.           From left to right: original image, map, resulting image
  63.         </span>
  64.       </b>
  65.           </p>
  66.           <div class="figure-contents">
  67.             <div class="mediaobject">
  68.               <img src="../images/filters/examples/map-lic-s.png" alt="From left to right: original image, map, resulting image" />
  69.               <div class="caption">
  70.                 <p>
  71.             Map has three stripes: a solid black area, a vertical gradient
  72.             area, a solid white area. One can see, on the resulting image,
  73.             that image zones corresponding to solid areas of the map, are not
  74.             blurred. Only the image zone corresponding to the gradient area of
  75.             the map is blurred.
  76.           </p>
  77.               </div>
  78.             </div>
  79.           </div>
  80.         </div>
  81.         <br class="figure-break" />
  82.         <p>
  83.       You can find this filter through
  84.       <span class="guimenu">Filters</span> ‚Üí <span class="guisubmenu">Artistic</span> ‚Üí <span class="guimenuitem"><span class="accel">V</span>an Gogh (LIC)</span>.
  85.     </p>
  86.         <p>
  87.       ‚Äú<span class="quote">LIC</span>‚Äù stands for Line Integral Convolution, a
  88.       mathematical method.
  89.       The plug-in author uses mathematical terms to name his options...
  90.       This filter is used to apply a directional blur to an image, or to
  91.       create textures. It could be called ‚Äú<span class="quote">Astigmatism</span>‚Äù as it
  92.       blurs certain directions in the image.
  93.     </p>
  94.         <p>
  95.       It uses a blur map. Unlike other maps, this filter doesn't use grey
  96.       levels of this blur map. <span class="emphasis"><em>Filter takes in account only
  97.         gradient direction(s)</em></span>. Image pixels corresponding to
  98.       solid areas of the map are ignored.
  99.     </p>
  100.       </div>
  101.       <div class="sect3" lang="en" xml:lang="en">
  102.         <div class="titlepage">
  103.           <div>
  104.             <div>
  105.               <h4 class="title"><a id="id2761812"></a>9.10.2.¬†
  106.       <span lang="en" xml:lang="en">Options</span>
  107.     </h4>
  108.             </div>
  109.           </div>
  110.         </div>
  111.         <div class="figure">
  112.           <a id="id2761822"></a>
  113.           <p class="title">
  114.             <b>Figure¬†16.183.¬†
  115.         <span lang="en" xml:lang="en">
  116.           ‚Äú<span class="quote">Van Gogh (LIC)</span>‚Äù filter options
  117.         </span>
  118.       </b>
  119.           </p>
  120.           <div class="figure-contents">
  121.             <div class="mediaobject">
  122.               <img src="../images/filters/options-artistic-vangogh.png" alt="Van Gogh (LIC) filter options" />
  123.             </div>
  124.           </div>
  125.         </div>
  126.         <br class="figure-break" />
  127.         <div class="tip" style="margin-left: 0.5in; margin-right: 0.5in;">
  128.           <table border="0" summary="Tip">
  129.             <tr>
  130.               <td rowspan="2" align="center" valign="top" width="25">
  131.                 <img alt="[Tip]" src="../images/tip.png" />
  132.               </td>
  133.               <th align="left">Tip</th>
  134.             </tr>
  135.             <tr>
  136.               <td align="left" valign="top">
  137.                 <div class="itemizedlist">
  138.                   <ul type="disc">
  139.                     <li>
  140.                       <p>
  141.             To create a blur, check <span class="guilabel">With Source Image</span>.
  142.             Only Filter Length slider and perhaps Integration Steps slider,
  143.             are useful.
  144.           </p>
  145.                     </li>
  146.                     <li>
  147.                       <p>
  148.             To create a texture, check <span class="guilabel">With White Noise</span>.
  149.             All sliders can be useful.
  150.           </p>
  151.                     </li>
  152.                   </ul>
  153.                 </div>
  154.               </td>
  155.             </tr>
  156.           </table>
  157.         </div>
  158.         <div class="variablelist">
  159.           <dl>
  160.             <dt>
  161.               <span class="term">
  162.           <span lang="en" xml:lang="en">Convolution</span>
  163.         </span>
  164.             </dt>
  165.             <dd>
  166.               <p>
  167.             You can use two types of convolution. That's the first parameter
  168.             you have to set:
  169.           </p>
  170.               <div class="itemizedlist">
  171.                 <ul type="disc">
  172.                   <li>
  173.                     <p>
  174.                 <span class="guilabel">With White Noise</span>: White Noise is an
  175.                 acoustics name. It's a noise where all frequencies have
  176.                 the same amplitude. Here, this option is used to create
  177.                 patterns.
  178.               </p>
  179.                   </li>
  180.                   <li>
  181.                     <p>
  182.                 <span class="guilabel">With Source Image</span>: The source
  183.                 image will be blurred.
  184.               </p>
  185.                   </li>
  186.                 </ul>
  187.               </div>
  188.             </dd>
  189.             <dt>
  190.               <span class="term">
  191.           <span lang="en" xml:lang="en">Effect Image</span>
  192.         </span>
  193.             </dt>
  194.             <dd>
  195.               <p>
  196.             That's the map for blur or pattern direction. This map must have
  197.             the same dimensions as the original image. It must be preferably a
  198.             grayscale image. It must be present on your screen when you call
  199.             filter so that you can choose it in the drop-list.
  200.           </p>
  201.               <div class="figure">
  202.                 <a id="id2761980"></a>
  203.                 <p class="title">
  204.                   <b>Figure¬†16.184.¬†
  205.               <span lang="en" xml:lang="en">Blurring with vertical gradient map</span>
  206.             </b>
  207.                 </p>
  208.                 <div class="figure-contents">
  209.                   <div class="mediaobject">
  210.                     <img src="../images/filters/examples/map-lic-vert-blur.png" alt="Blurring with vertical gradient map" />
  211.                     <div class="caption">
  212.                       <p>
  213.                   With a vertical gradient map, vertical lines are blurred.
  214.                 </p>
  215.                     </div>
  216.                   </div>
  217.                 </div>
  218.               </div>
  219.               <br class="figure-break" />
  220.               <div class="figure">
  221.                 <a id="id2762017"></a>
  222.                 <p class="title">
  223.                   <b>Figure¬†16.185.¬†
  224.               <span lang="en" xml:lang="en">Blurring with a square gradient map</span>
  225.             </b>
  226.                 </p>
  227.                 <div class="figure-contents">
  228.                   <div class="mediaobject">
  229.                     <img src="../images/filters/examples/map-lic-sq-blur.png" alt="Blurring with a square gradient map" />
  230.                     <div class="caption">
  231.                       <p>
  232.                   The gradient map is divided into four gradient triangles:
  233.                   each of them has its own gradient direction. In every area
  234.                   of the image corresponding to gradient triangles, only lines
  235.                   with the same direction as gradient are blurred.
  236.                 </p>
  237.                     </div>
  238.                   </div>
  239.                 </div>
  240.               </div>
  241.               <br class="figure-break" />
  242.               <div class="figure">
  243.                 <a id="id2762059"></a>
  244.                 <p class="title">
  245.                   <b>Figure¬†16.186.¬†
  246.               <span lang="en" xml:lang="en">Texture example</span>
  247.             </b>
  248.                 </p>
  249.                 <div class="figure-contents">
  250.                   <div class="mediaobject">
  251.                     <img src="../images/filters/examples/map-lic-vert-pat.png" alt="Texture example" />
  252.                     <div class="caption">
  253.                       <p>
  254.                   The ‚Äú<span class="quote">With white noise</span>‚Äù
  255.                   option is checked. Others are default. With a vertical
  256.                   gradient map, texture ‚Äú<span class="quote">fibres</span>‚Äù
  257.                   are going horizontally.
  258.                 </p>
  259.                     </div>
  260.                   </div>
  261.                 </div>
  262.               </div>
  263.               <br class="figure-break" />
  264.             </dd>
  265.             <dt>
  266.               <span class="term">
  267.           <span lang="en" xml:lang="en">Effect Channel</span>
  268.         </span>
  269.             </dt>
  270.             <dd>
  271.               <p>
  272.             By selecting <span class="guilabel">Hue</span>, <span class="guilabel">Saturation
  273.             </span> or <span class="guilabel">Brightness (=Value)</span>, filter
  274.             will use this channel to treat image.
  275.           </p>
  276.             </dd>
  277.             <dt>
  278.               <span class="term">
  279.           <span lang="en" xml:lang="en">Effect Operator</span>
  280.         </span>
  281.             </dt>
  282.             <dd>
  283.               <p>
  284.             The ‚Äú<span class="quote">Derivative</span>‚Äù option reverses ‚Äú<span class="quote">Gradient
  285.             </span>‚Äù direction:
  286.           </p>
  287.               <div class="figure">
  288.                 <a id="id2762174"></a>
  289.                 <p class="title">
  290.                   <b>Figure¬†16.187.¬†
  291.               <span lang="en" xml:lang="en">Derivative option example</span>
  292.             </b>
  293.                 </p>
  294.                 <div class="figure-contents">
  295.                   <div class="mediaobject">
  296.                     <img src="../images/filters/examples/map-lic-deriv.png" alt="Derivative option example" />
  297.                     <div class="caption">
  298.                       <p>
  299.                   Using a square gradient map, Effect operator is on
  300.                   ‚Äú<span class="quote">Gradient</span>‚Äù on the left, on
  301.                   ‚Äú<span class="quote">Derivative</span>‚Äù on the right: what was sharp is
  302.                   blurred and conversely.
  303.                 </p>
  304.                     </div>
  305.                   </div>
  306.                 </div>
  307.               </div>
  308.               <br class="figure-break" />
  309.             </dd>
  310.             <dt>
  311.               <span class="term">
  312.           <span lang="en" xml:lang="en">Filter Length</span>
  313.         </span>
  314.             </dt>
  315.             <dd>
  316.               <p>
  317.             When applying blur, this option controls how important blur is.
  318.             When creating a texture, it controls how rough texture is: low
  319.             values result in smooth surface; high values in rough surface.
  320.           </p>
  321.               <div class="figure">
  322.                 <a id="id2762246"></a>
  323.                 <p class="title">
  324.                   <b>Figure¬†16.188.¬†
  325.               <span lang="en" xml:lang="en">
  326.                 Action example of Filter Length on blur
  327.               </span>
  328.             </b>
  329.                 </p>
  330.                 <div class="figure-contents">
  331.                   <div class="mediaobject">
  332.                     <img src="../images/filters/examples/map-lic-blur-lg.png" alt="Action example of Filter Length on blur" />
  333.                     <div class="caption">
  334.                       <p>
  335.                   On the left: a vertical line, one pixel wide (zoom 800%). On
  336.                   the right: the same line, after applying a vertical blur
  337.                   with a Filter Length to 3. You can see that blur width is 6
  338.                   pixels, 3 pixels on both sides.
  339.                 </p>
  340.                     </div>
  341.                   </div>
  342.                 </div>
  343.               </div>
  344.               <br class="figure-break" />
  345.               <div class="figure">
  346.                 <a id="id2762288"></a>
  347.                 <p class="title">
  348.                   <b>Figure¬†16.189.¬†
  349.               <span lang="en" xml:lang="en">Filter Length example on texture</span>
  350.             </b>
  351.                 </p>
  352.                 <div class="figure-contents">
  353.                   <div class="mediaobject">
  354.                     <img src="../images/filters/examples/map-lic-text-lg.png" alt="Filter Length example on texture" />
  355.                     <div class="caption">
  356.                       <p>
  357.                   On the left: a texture with Filter Length=3. On the right,
  358.                   the same texture with Filter Length=24.
  359.                 </p>
  360.                     </div>
  361.                   </div>
  362.                 </div>
  363.               </div>
  364.               <br class="figure-break" />
  365.             </dd>
  366.             <dt>
  367.               <span class="term">
  368.           <span lang="en" xml:lang="en">Noise Magnitude</span>
  369.         </span>
  370.             </dt>
  371.             <dd>
  372.               <p>
  373.             This options controls the amount and size of White Noise. Low
  374.             values produce finely grained surfaces. High values produce
  375.             coarse-grained textures.
  376.           </p>
  377.               <div class="figure">
  378.                 <a id="id2762350"></a>
  379.                 <p class="title">
  380.                   <b>Figure¬†16.190.¬†
  381.               <span lang="en" xml:lang="en">
  382.                 Action example of Noise Magnitude on texture
  383.               </span>
  384.             </b>
  385.                 </p>
  386.                 <div class="figure-contents">
  387.                   <div class="mediaobject">
  388.                     <img src="../images/filters/examples/map-lic-vp-nm4.png" alt="Action example of Noise Magnitude on texture" />
  389.                     <div class="caption">
  390.                       <p>Noise magnitude = 4</p>
  391.                     </div>
  392.                   </div>
  393.                 </div>
  394.               </div>
  395.               <br class="figure-break" />
  396.             </dd>
  397.             <dt>
  398.               <span class="term">
  399.           <span lang="en" xml:lang="en">Integration Steps</span>
  400.         </span>
  401.             </dt>
  402.             <dd>
  403.               <p>
  404.             This options controls the influence of gradient map on texture.
  405.           </p>
  406.               <div class="figure">
  407.                 <a id="id2762409"></a>
  408.                 <p class="title">
  409.                   <b>Figure¬†16.191.¬†
  410.               <span lang="en" xml:lang="en">
  411.                 Action example of Integration Steps on texture
  412.               </span>
  413.             </b>
  414.                 </p>
  415.                 <div class="figure-contents">
  416.                   <div class="mediaobject">
  417.                     <img src="../images/filters/examples/map-lic-is.png" alt="Action example of Integration Steps on texture" />
  418.                     <div class="caption">
  419.                       <p>
  420.                   On the left: Integration Steps = 2. On the right:
  421.                   Integration Steps = 4.
  422.                 </p>
  423.                     </div>
  424.                   </div>
  425.                 </div>
  426.               </div>
  427.               <br class="figure-break" />
  428.             </dd>
  429.             <dt>
  430.               <span class="term">
  431.           <span lang="en" xml:lang="en">Minimum/Maximum values</span>
  432.         </span>
  433.             </dt>
  434.             <dd>
  435.               <p>
  436.             Both values determine a range controlling texture contrast:
  437.             shrunk range results in high contrast and enlarged range results
  438.             in low contrast.
  439.           </p>
  440.               <div class="figure">
  441.                 <a id="id2762472"></a>
  442.                 <p class="title">
  443.                   <b>Figure¬†16.192.¬†
  444.               <span lang="en" xml:lang="en">
  445.                 Action example of Min/max values on texture
  446.               </span>
  447.             </b>
  448.                 </p>
  449.                 <div class="figure-contents">
  450.                   <div class="mediaobject">
  451.                     <img src="../images/filters/examples/map-lic-mm.png" alt="Action example of Min/max values on texture" />
  452.                     <div class="caption">
  453.                       <p>
  454.                   Minimum value = -4.0. Maximum value = 5.0.
  455.                 </p>
  456.                     </div>
  457.                   </div>
  458.                 </div>
  459.               </div>
  460.               <br class="figure-break" />
  461.             </dd>
  462.           </dl>
  463.         </div>
  464.       </div>
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  473.               <img src="../images/up.png" alt="Up" />
  474.             </a>
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  479.           <td width="40%" align="left" valign="top"><a accesskey="p" href="script-fu-predator.html">9.9.¬†
  480.     <span lang="en" xml:lang="en">Predator</span>
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  488.     <span lang="en" xml:lang="en">Soft Glow</span>
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