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  5.     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
  6.     <title>12.3.┬áGradient Editor</title>
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  11.     <link rel="up" href="ch04s12.html" title="12.┬áGradients dialog" />
  12.     <link rel="prev" href="ch04s12s02.html" title="12.2.┬áUsing the Gradients dialog" />
  13.     <link rel="next" href="ch04s13.html" title="13.┬áPalettes" />
  14.   </head>
  15.   <body>
  16.     <div xmlns="" class="navheader">
  17.       <table width="100%" summary="Navigation header">
  18.         <tr>
  19.           <th colspan="3" align="center" id="chaptername">12.┬áGradients dialog</th>
  20.         </tr>
  21.         <tr>
  22.           <td width="20%" align="left"><a accesskey="p" href="ch04s12s02.html">Prev</a>┬á</td>
  23.           <th width="60%" align="center" id="sectionname">12.3.┬áGradient Editor</th>
  24.           <td width="20%" align="right">┬á<a accesskey="n" href="ch04s13.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="gimp-gradient-editor-dialog"></a>12.3.┬áGradient Editor</h3>
  34.           </div>
  35.         </div>
  36.       </div>
  37.       <a id="gimp-gradient-edit"></a>
  38.       <div class="informalfigure">
  39.         <div class="mediaobject">
  40.           <img src="../images/dialogs/dialogs-gradient-editor.png" />
  41.           <div class="caption">
  42.             <p>
  43.           The gradient editor
  44.         </p>
  45.           </div>
  46.         </div>
  47.       </div>
  48.       <p>
  49.     The Gradient Editor allows you to edit the colors in a
  50.     gradient.  It can only be used on gradients you have created
  51.     yourself, not on the gradients that come pre-installed with
  52.     GIMP.  This is a sophisticated tool that may take a bit of
  53.     effort to understand.  The concept behind it is that a gradient
  54.     can be decomposed into a series of adjoining
  55.     <span class="emphasis"><em>segments</em></span>, with each segment consisting of a
  56.     smooth transition from the color on the left edge to the color
  57.     on the right edge.  The Gradient Editor allows you to pack
  58.     together any number of segments, with any colors you want for the
  59.     left and right edges of each segment, and with several options for
  60.     the shape of the transition from left to right. 
  61.   </p>
  62.       <div class="variablelist">
  63.         <p class="title">
  64.           <b>Layout</b>
  65.         </p>
  66.         <dl>
  67.           <dt>
  68.             <span class="term">Name</span>
  69.           </dt>
  70.           <dd>
  71.             <p>
  72.           At the top of the dialog you see the name of the
  73.           gradient.  You can edit this if you want to.
  74.         </p>
  75.           </dd>
  76.           <dt>
  77.             <span class="term">Gradient Display</span>
  78.           </dt>
  79.           <dd>
  80.             <p>
  81.           Below the name, you see the current result of your work.
  82.         </p>
  83.           </dd>
  84.           <dt>
  85.             <span class="term">Range Selection/Control Sliders</span>
  86.           </dt>
  87.           <dd>
  88.             <p>
  89.           Below the gradient display, you see a set of black and
  90.           white triangles lined up in row.  A
  91.           <span class="emphasis"><em>segment</em></span> is the space between two
  92.           consecutive <span class="emphasis"><em>black</em></span> triangles.  Inside
  93.           each segment is a white triangle, which is used to "warp"
  94.           the colors in the segment, in the same way that the middle
  95.           slider in the Levels tool warps the colors there.  You can
  96.           select a segment by clicking between the two black triangles
  97.           that define it.  You can select a range of segments
  98.           by shift-clicking on them.  The selected range always
  99.           consists of a set of <span class="emphasis"><em>consecutive</em></span>
  100.           segments, so if you skip over any when shift-clicking, they
  101.           will be included automatically.
  102.           If "Instant update" is checked, the display is updated
  103.           immediately after any slider movement; if it is unchecked,
  104.           updates only occur when you release the mouse button.
  105.         </p>
  106.           </dd>
  107.           <dt>
  108.             <span class="term">Scrollbar</span>
  109.           </dt>
  110.           <dd>
  111.             <p>
  112.           Below the sliders is a scrollbar.  This only comes into play if
  113.           you zoom in using the buttons at the bottom.
  114.         </p>
  115.           </dd>
  116.           <dt>
  117.             <span class="term">Feedback Area</span>
  118.           </dt>
  119.           <dd>
  120.             <p>
  121.           Below the sliders is an area that initially is blank, but
  122.           depending on your actions, helpful hints or feedback
  123.           messages may appear here.
  124.         </p>
  125.           </dd>
  126.           <dt>
  127.             <span class="term">Buttons</span>
  128.           </dt>
  129.           <dd>
  130.             <p>
  131.           At the bottom of the dialog appear five buttons:
  132.         </p>
  133.             <p><b>Save.┬á</b>
  134.       Clicking this button causes the gradient, in its current
  135.       state, to be saved in your personal
  136.       <tt class="filename">gradients</tt> folder, so that it will
  137.       automatically be loaded the next time you start GIMP.
  138.     </p>
  139.             <p><b>Revert.┬á</b>
  140.       Clicking this button undoes all of your editing.  (However,
  141.       at the time this is being written, this function is not yet
  142.       implemented.)
  143.     </p>
  144.             <a id="gimp-gradient-editor-zoom-out"></a>
  145.             <p><b>Zoom Out.┬á</b>
  146.       Clicking this button shrinks the gradient display
  147.       horizontally. 
  148.     </p>
  149.             <a id="gimp-gradient-editor-zoom-in"></a>
  150.             <p><b>Zoom In.┬á</b>
  151.       Clicking this button expands the gradient display
  152.       horizontally.  You can then use the scrollbar to pan the
  153.       display left or right.
  154.     </p>
  155.             <a id="gimp-gradient-editor-zoom-all"></a>
  156.             <p><b>Zoom All.┬á</b>
  157.       Clicking this button resizes the display horizontally so that
  158.       it fits precisely into the window.
  159.     </p>
  160.           </dd>
  161.         </dl>
  162.       </div>
  163.       <div class="simplesect" lang="en" xml:lang="en">
  164.         <div class="titlepage">
  165.           <div>
  166.             <div>
  167.               <h4 class="title"><a id="id3454731"></a>Gradient Editor Menu</h4>
  168.             </div>
  169.           </div>
  170.         </div>
  171.         <div class="informalfigure">
  172.           <div class="mediaobject">
  173.             <img src="../images/dialogs/dialogs-gradient-editor-menu.png" />
  174.             <div class="caption">
  175.               <p>
  176.       The Gradient Editor menu
  177.     </p>
  178.             </div>
  179.           </div>
  180.         </div>
  181.         <p>
  182.       You can access the Gradient Editor menu either by
  183.       right-clicking on the gradient display, or by choosing the top
  184.       item in the dialog's tab menu.  The menu allows you to set the
  185.       left and right edge colors for each segment, and control the
  186.       transition from one color to the other.
  187.     </p>
  188.         <div class="variablelist">
  189.           <p class="title">
  190.             <b>Options</b>
  191.           </p>
  192.           <dl>
  193.             <dt>
  194.               <span class="term">Left [Right] Endpoint's Color</span>
  195.             </dt>
  196.             <dd>
  197.               <a id="gimp-gradient-editor-left-color"></a>
  198.               <a id="gimp-gradient-editor-right-color"></a>
  199.               <p>
  200.             These options allow you to choose a color for the
  201.             respective endpoint using a Color Editor.
  202.           </p>
  203.             </dd>
  204.             <dt>
  205.               <span class="term">Load Left [Right] Color From</span>
  206.             </dt>
  207.             <dd>
  208.               <a id="gimp-gradient-editor-left-load"></a>
  209.               <a id="gimp-gradient-editor-right-load"></a>
  210.               <div class="informalfigure">
  211.                 <div class="mediaobject">
  212.                   <img src="../images/dialogs/dialogs-gradient-editor-colorfrom.png" />
  213.                   <div class="caption">
  214.                     <p>
  215.                   The "Load Color From" submenu
  216.                 </p>
  217.                   </div>
  218.                 </div>
  219.               </div>
  220.               <p>
  221.             These options give you a number of alternative ways of
  222.             assigning colors to the endpoints.  From the submenu you
  223.             can choose (assuming we're dealing with the left
  224.             endpoint): 
  225.           </p>
  226.               <div class="itemizedlist">
  227.                 <ul type="disc">
  228.                   <li>
  229.                     <p><b>Left Neighbor's Right Endpoint.┬á</b>
  230.                   This choice will cause the color of the right endpoint
  231.                   of the segment neighboring on the left to be assigned
  232.                   to the left endpoint of the selected range.
  233.                 </p>
  234.                   </li>
  235.                   <li>
  236.                     <p><b>Right Endpoint.┬á</b>
  237.                   This choice will cause the color of the right endpoint
  238.                   of the selected range to be assigned to the left
  239.                   endpoint.
  240.                 </p>
  241.                   </li>
  242.                   <li>
  243.                     <p><b>FG/BG color.┬á</b>
  244.                   These choice cause GIMP's current foreground or
  245.                   background color, as shown in the Toolbox, to be
  246.                   assigned to the endpoint.
  247.                 </p>
  248.                   </li>
  249.                   <li>
  250.                     <p><b>RGBA slots.┬á</b>
  251.                   At the bottom of the menu are 10 "memory slots".  You
  252.                   can assign colors to them using the "Save" menu option
  253.                   described below.  If you choose one of the slots, the
  254.                   color in it will be assigned to the endpoint. 
  255.                 </p>
  256.                   </li>
  257.                 </ul>
  258.               </div>
  259.             </dd>
  260.             <dt>
  261.               <span class="term">Save Left [Right] Color To</span>
  262.             </dt>
  263.             <dd>
  264.               <a id="gimp-gradient-editor-left-save"></a>
  265.               <a id="gimp-gradient-editor-right-save"></a>
  266.               <p>
  267.             These options cause the color of the endpoint in
  268.             question to be assigned to the "memory slot" selected
  269.             from the submenu.
  270.           </p>
  271.             </dd>
  272.             <dt>
  273.               <span class="term">Blending Function for Selection</span>
  274.             </dt>
  275.             <dd>
  276.               <a id="gimp-gradient-editor-blending"></a>
  277.               <div class="informalfigure">
  278.                 <div class="mediaobject">
  279.                   <img src="../images/dialogs/dialogs-gradient-editor-blend.png" />
  280.                   <div class="caption">
  281.                     <p>
  282.                   The Blending Function submenu
  283.                 </p>
  284.                   </div>
  285.                 </div>
  286.               </div>
  287.               <p>
  288.             This option determines the course of the transition from
  289.             one endpoint of the range to the other, by fitting the
  290.             specified type of function to the endpoints and midpoint
  291.             of the range.
  292.           </p>
  293.             </dd>
  294.             <dt>
  295.               <span class="term">Coloring Type for Selection</span>
  296.             </dt>
  297.             <dd>
  298.               <a id="gimp-gradient-editor-coloring"></a>
  299.               <div class="informalfigure">
  300.                 <div class="mediaobject">
  301.                   <img src="../images/dialogs/dialogs-gradient-editor-color.png" />
  302.                   <div class="caption">
  303.                     <p>
  304.                   The Coloring Type submenu
  305.                 </p>
  306.                   </div>
  307.                 </div>
  308.               </div>
  309.               <p>
  310.             This option gives you additional control of the type of
  311.             transition from one endpoint to the other:  as a line
  312.             either in RGB space or in HSV space.
  313.           </p>
  314.             </dd>
  315.             <dt>
  316.               <span class="term">Flip Selection</span>
  317.             </dt>
  318.             <dd>
  319.               <a id="gimp-gradient-editor-flip"></a>
  320.               <p>
  321.             This option does a right-to-left flip of the selected
  322.             range, flipping all colors and endpoint locations.
  323.           </p>
  324.             </dd>
  325.             <dt>
  326.               <span class="term">Replicate Selection</span>
  327.             </dt>
  328.             <dd>
  329.               <a id="gimp-gradient-editor-replicate"></a>
  330.               <p>
  331.             This option splits the selected range into two parts,
  332.             each of which is a perfect compressed copy of the
  333.             original range.
  334.           </p>
  335.             </dd>
  336.             <dt>
  337.               <span class="term">Split Segments at Midpoints</span>
  338.             </dt>
  339.             <dd>
  340.               <a id="gimp-gradient-editor-split-midpoint"></a>
  341.               <p>
  342.             This option splits each segment in the selected range in into
  343.             two segments, splitting at the location of the white
  344.             triangle. 
  345.           </p>
  346.             </dd>
  347.             <dt>
  348.               <span class="term">Split Segments Uniformly</span>
  349.             </dt>
  350.             <dd>
  351.               <a id="gimp-gradient-editor-split-uniform"></a>
  352.               <p>
  353.             This option is similar to the previous one, but it
  354.             splits each segment halfway between the endpoints,
  355.             instead of at the white triangle.
  356.           </p>
  357.             </dd>
  358.             <dt>
  359.               <span class="term">Delete Selection</span>
  360.             </dt>
  361.             <dd>
  362.               <a id="gimp-gradient-editor-delete"></a>
  363.               <p>
  364.             This option deletes all segments in the selected range,
  365.             replacing them with a single black triangle at the
  366.             center, and enlarging the segments on both sides to fill
  367.             the void.
  368.           </p>
  369.             </dd>
  370.             <dt>
  371.               <span class="term">Re-center Midpoints in Selection</span>
  372.             </dt>
  373.             <dd>
  374.               <a id="gimp-gradient-editor-recenter"></a>
  375.               <p>
  376.             This option moves the white triangle for each segment in
  377.             the selected range to a point halfway between the
  378.             neighboring black triangles.
  379.           </p>
  380.             </dd>
  381.             <dt>
  382.               <span class="term">Re-distribute Handles in Selection</span>
  383.             </dt>
  384.             <dd>
  385.               <a id="gimp-gradient-editor-redistribute"></a>
  386.               <p>
  387.             This option causes the black and white triangles in
  388.             the selected range to be shifted so that the distances
  389.             from one to the next are all equal.
  390.           </p>
  391.             </dd>
  392.             <dt>
  393.               <span class="term">Blend Endpoints' Colors</span>
  394.             </dt>
  395.             <dd>
  396.               <a id="gimp-gradient-editor-blend-color"></a>
  397.               <p>
  398.             This option is only available if more than one segment
  399.             is selected.  It causes the colors at interior endpoints
  400.             in the range to be averaged, so that the transition
  401.             from each segment to the next is smooth.
  402.           </p>
  403.             </dd>
  404.             <dt>
  405.               <span class="term">Blend Endpoints' Opacity</span>
  406.             </dt>
  407.             <dd>
  408.               <a id="gimp-gradient-editor-blend-opacity"></a>
  409.               <p>
  410.             This option does the same thing as the previous option,
  411.             but with opacity instead of color.
  412.           </p>
  413.             </dd>
  414.           </dl>
  415.         </div>
  416.         <div class="caution" style="margin-left: 0.5in; margin-right: 0.5in;">
  417.           <table border="0" summary="Caution">
  418.             <tr>
  419.               <td rowspan="2" align="center" valign="top" width="25">
  420.                 <img alt="[Caution]" src="../images/caution.png" />
  421.               </td>
  422.               <th align="left">Caution</th>
  423.             </tr>
  424.             <tr>
  425.               <td colspan="2" align="left" valign="top">
  426.                 <p> 
  427.       There is no "undo" available within the Gradient Editor, so be
  428.       careful! 
  429.       </p>
  430.               </td>
  431.             </tr>
  432.           </table>
  433.         </div>
  434.       </div>
  435.       <div class="simplesect" lang="en" xml:lang="en">
  436.         <div class="titlepage">
  437.           <div>
  438.             <div>
  439.               <h4 class="title"><a id="id3455201"></a>The first four gradients in the list</h4>
  440.             </div>
  441.           </div>
  442.         </div>
  443.         <p>
  444.     The first four gradients in the list are special:  they use the
  445.     Foreground and Background colors from the Toolbox Color Area, 
  446.     instead of being fixed.  See the <a href="ch02s04s09.html" title="4.9.┬áGradients">Gradients</a>
  447.     section for more information.
  448.   </p>
  449.       </div>
  450.     </div>
  451.     <div class="navfooter">
  452.       <hr />
  453.       <table width="100%" summary="Navigation footer">
  454.         <tr>
  455.           <td width="40%" align="left"><a accesskey="p" href="ch04s12s02.html">Prev</a>┬á</td>
  456.           <td width="20%" align="center">
  457.             <a accesskey="u" href="ch04s12.html">Up</a>
  458.           </td>
  459.           <td width="40%" align="right">┬á<a accesskey="n" href="ch04s13.html">Next</a></td>
  460.         </tr>
  461.         <tr>
  462.           <td width="40%" align="left" valign="top">12.2.┬áUsing the Gradients dialog┬á</td>
  463.           <td width="20%" align="center">
  464.             <a accesskey="h" href="index.html">Home</a>
  465.           </td>
  466.           <td width="40%" align="right" valign="top">┬á13.┬áPalettes</td>
  467.         </tr>
  468.       </table>
  469.     </div>
  470.   </body>
  471. </html>
  472.