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  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>3.5.7.┬áCurves Tool</title>
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  11.     <link rel="up" href="ch03s03s05.html" title="3.5.┬áColor Tools" />
  12.     <link rel="previous" href="ch03s03s05s06.html" title="3.5.6.┬áLevels tool" />
  13.     <link rel="next" href="ch03s03s05s08.html" title="3.5.8.┬áPosterize Tool" />
  14.   </head>
  15.   <body>
  16.     <div class="navheader">
  17.       <table width="100%" summary="Navigation header">
  18.         <tr>
  19.           <th colspan="3" align="center">3.5.7.┬áCurves Tool</th>
  20.         </tr>
  21.         <tr>
  22.           <td width="20%" align="left"><a accesskey="p" href="ch03s03s05s06.html">Prev</a>┬á</td>
  23.           <th width="60%" align="center">3.5.┬áColor Tools</th>
  24.           <td width="20%" align="right">┬á<a accesskey="n" href="ch03s03s05s08.html">Next</a></td>
  25.         </tr>
  26.       </table>
  27.       <hr />
  28.     </div>
  29.     <div class="sect3" lang="en" xml:lang="en">
  30.       <div class="titlepage">
  31.         <div>
  32.           <div>
  33.             <h4 class="title"><a id="gimp-tool-curves"></a>3.5.7.┬áCurves Tool</h4>
  34.           </div>
  35.         </div>
  36.         <div></div>
  37.       </div>
  38.       <div class="mediaobject">
  39.         <img src="../images/toolbox/tools-curves.png" />
  40.       </div>
  41.       <p>
  42.     The Curves tool is the most sophisticated tool used to adjust the
  43.     tonality of images. From the Image window it is located in Tools >
  44.     Color Tools...
  45.   </p>
  46.       <div class="simplesect" lang="en" xml:lang="en">
  47.         <div class="titlepage">
  48.           <div>
  49.             <div>
  50.               <h5 class="title"><a id="id2957660"></a>Activate Tool</h5>
  51.             </div>
  52.           </div>
  53.           <div></div>
  54.         </div>
  55.         <p>
  56.       The Curves Tool can be called in the following
  57.       order, from the image-menu:
  58.       <span class="guimenuitem"><span class="accel">T</span>ools</span>/
  59.       <span class="guimenuitem"><span class="accel">C</span>olor
  60.         Tools</span>/<span class="guimenuitem"><span class="accel">C</span>urves
  61.         .</span> 
  62.     </p>
  63.       </div>
  64.       <div class="simplesect" lang="en" xml:lang="en">
  65.         <div class="titlepage">
  66.           <div></div>
  67.           <div></div>
  68.         </div>
  69.         <div class="variablelist">
  70.           <p class="title">
  71.             <b>Options</b>
  72.           </p>
  73.           <dl>
  74.             <dt>
  75.               <span class="term">Modify Curves for Channel</span>
  76.             </dt>
  77.             <dd>
  78.               <p>
  79.           There are five options: Value for luminosity and contrast; Red,
  80.           Green, and Blue for saturation; and Alpha.
  81.         </p>
  82.               <p>
  83.           <span class="guilabel">Initialize</span> button deletes all changes made to 
  84.           the selected channel.
  85.         </p>
  86.             </dd>
  87.             <dt>
  88.               <span class="term">Main Editing Area</span>
  89.             </dt>
  90.             <dd>
  91.               <p>
  92.           <span class="guilabel">Input and Output Value Domains</span>: The
  93.           horizontal bar (x-axis) represents input values (they are value
  94.           levels from  0 to 255). The vertical bar (y-axis) is only a scale
  95.           for output colors of the selected channel.
  96.         </p>
  97.               <p>
  98.           <span class="guilabel">The control curve</span> is drawn on a grid and
  99.           goes from bottom left corner to top right corner. Pointer x/y
  100.           position is permanently displayed in top left part of the grid.
  101.           If you click on the curve, a <span class="guilabel">Control point</span>
  102.           is created. You can move it to bend the curve. If you click
  103.           outside of the curve, a control point is also created, and the
  104.           curve includes it automatically.
  105.         </p>
  106.               <p>
  107.           So, each point of the curve represents an 'x' level,
  108.           corresponding to an 'y' color. If, for example, you move a curve
  109.           segment to the right, i.e to highlights, you can see that these
  110.           highlights are corresponding to darker output tones and that
  111.           image pixels corresponding to this curve segment will go darker.
  112.           With color channels, moving right will decrease saturation ans
  113.           can reach the complementary color.
  114.         </p>
  115.               <p>
  116.           To delete all control points (apart from both ends), click on the
  117.           'Initialize Channel' button. To delete only one point, move it
  118.           onto another point or to grid border.
  119.         </p>
  120.             </dd>
  121.             <dt>
  122.               <span class="term">All Channels</span>
  123.             </dt>
  124.             <dd>
  125.               <p>
  126.           <span class="guilabel">Load</span>: This button allows you to select a file 
  127.           holding curve settings.
  128.         </p>
  129.               <p>
  130.           <span class="guilabel">Save</span>: Allows you to save any curves you have set 
  131.           to a file that can be loaded later.
  132.         </p>
  133.             </dd>
  134.             <dt>
  135.               <span class="term">Curve Type</span>
  136.             </dt>
  137.             <dd>
  138.               <p>
  139.           <span class="guilabel">Smooth</span>: This mode constrains the curve type 
  140.           to a smooth line with tension. It provides a more realistic 
  141.           render than the following.
  142.         </p>
  143.               <p>
  144.           <span class="guilabel">Free</span>: You can draw your curve free-hand with 
  145.           the mouse. With curve segments scattered all over the grid, 
  146.           result will be surprising, but poorly repeatable.
  147.         </p>
  148.             </dd>
  149.             <dt>
  150.               <span class="term">Preview</span>
  151.             </dt>
  152.             <dd>
  153.               <p>
  154.           The Preview button makes all changes to the levels dynamically so 
  155.           that the new level settings can be viewed immediately.
  156.         </p>
  157.             </dd>
  158.           </dl>
  159.         </div>
  160.       </div>
  161.     </div>
  162.     <div class="navfooter">
  163.       <hr />
  164.       <table width="100%" summary="Navigation footer">
  165.         <tr>
  166.           <td width="40%" align="left"><a accesskey="p" href="ch03s03s05s06.html">Prev</a>┬á</td>
  167.           <td width="20%" align="center">
  168.             <a accesskey="u" href="ch03s03s05.html">Up</a>
  169.           </td>
  170.           <td width="40%" align="right">┬á<a accesskey="n" href="ch03s03s05s08.html">Next</a></td>
  171.         </tr>
  172.         <tr>
  173.           <td width="40%" align="left" valign="top">3.5.6.┬áLevels tool┬á</td>
  174.           <td width="20%" align="center">
  175.             <a accesskey="h" href="index.html">Home</a>
  176.           </td>
  177.           <td width="40%" align="right" valign="top">┬á3.5.8.┬áPosterize Tool</td>
  178.         </tr>
  179.       </table>
  180.     </div>
  181.   </body>
  182. </html>
  183.