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  4.   <head>
  5.     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
  6.     <title>3.4.¬† Blend</title>
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  13.     <link rel="up" href="gimp-tools-paint.html" title="3.¬† Brush Tools" />
  14.     <link rel="prev" href="gimp-tool-bucket-fill.html" title="3.3.¬† Bucket Fill" />
  15.     <link rel="next" href="gimp-tool-pencil.html" title="3.5.¬† Pencil" />
  16.   </head>
  17.   <body>
  18.     <div class="navheader">
  19.       <table width="100%" summary="Navigation header">
  20.         <tr>
  21.           <th colspan="3" align="center">3.4.¬†
  22.     <span lang="en" xml:lang="en">Blend</span>
  23.   </th>
  24.         </tr>
  25.         <tr>
  26.           <td width="20%" align="left"><a accesskey="p" href="gimp-tool-bucket-fill.html"><img src="../images/prev.png" alt="Prev" /></a>¬†</td>
  27.           <th width="60%" align="center">3.¬†
  28.     <span lang="en" xml:lang="en">Brush Tools</span>
  29.   </th>
  30.           <td width="20%" align="right">¬†<a accesskey="n" href="gimp-tool-pencil.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="gimp-tool-blend"></a>3.4.¬†
  40.     <span lang="en" xml:lang="en">Blend</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: 2422 $</td>
  53.                   <td align="left">2008-01-17</td>
  54.                   <td align="left">alex falappa</td>
  55.                 </tr>
  56.               </table>
  57.             </div>
  58.           </div>
  59.         </div>
  60.       </div>
  61.       <a id="id2630105" class="indexterm"></a>
  62.       <a id="id2630114" class="indexterm"></a>
  63.       <a id="id2630126" class="indexterm"></a>
  64.       <div class="figure">
  65.         <a id="id2630139"></a>
  66.         <p class="title">
  67.           <b>Figure¬†13.48.¬†
  68.       <span lang="en" xml:lang="en">The Blend tool in Toolbox.</span>
  69.     </b>
  70.         </p>
  71.         <div class="figure-contents">
  72.           <div class="mediaobject">
  73.             <img src="../images/toolbox/toolbox-gradient.png" alt="The Blend tool in Toolbox." />
  74.           </div>
  75.         </div>
  76.       </div>
  77.       <br class="figure-break" />
  78.       <p>
  79.     This tool fills the selected area with a gradient blend of the foreground
  80.     and background colors by default, but there are many options. To make a
  81.     blend, drag the cursor in the direction you want the gradient to go, and
  82.     release the mouse button when you feel you have the right position and
  83.     size of your blend. The softness of the blend depends on how far you drag
  84.     the cursor. The shorter the drag distance, the sharper it will be.
  85.   </p>
  86.       <p>
  87.     There are an astonishing number of things you can do with this tool, and
  88.     the possibilities may seem a bit overwhelming at first. The two most
  89.     important options you have are the Gradient and the Shape. Clicking the
  90.     Gradient button in the tool options brings up a Gradient Select window,
  91.     allowing you to choose from among a variety of gradients supplied with
  92.     GIMP; you can also construct and save custom gradients. Further
  93.     information about gradients can be found in
  94.     <a class="xref" href="gimp-concepts-gradients.html" title="10.¬† Gradients">Section¬†10, ‚Äú
  95.     <span lang="en" xml:lang="en">Gradients</span>
  96.   ‚Äù</a> and
  97.     <a class="xref" href="gimp-gradient-dialog.html" title="3.4.¬† Gradients Dialog">Section¬†3.4, ‚Äú
  98.     <span lang="en" xml:lang="en">Gradients Dialog</span>
  99.   ‚Äù</a>.
  100.   </p>
  101.       <p>
  102.     For Shape, there are 11 options: Linear, Bilinear, Radial, Square, Conical
  103.     (symmetric), Conical (asymmetric), Shaped (angular), Shaped (spherical),
  104.     Shaped (dimpled), Spiral (clockwise), and Spiral (counterclockwise); these
  105.     are described in detail below. The Shaped options are the most
  106.     interesting: they cause the gradient to follow the shape of the selection
  107.     boundary, no matter how twisty it is. Unlike the other shapes, Shaped
  108.     gradients are not affected by the length or direction of the line you
  109.     draw: for them as well as every other type of gradient you are required to
  110.     click inside the selection and move the mouse, but a Shaped appears the
  111.     same no matter where you click or how you move.
  112.   </p>
  113.       <div class="tip" style="margin-left: 0.5in; margin-right: 0.5in;">
  114.         <table border="0" summary="Tip">
  115.           <tr>
  116.             <td rowspan="2" align="center" valign="top" width="25">
  117.               <img alt="[Tip]" src="../images/tip.png" />
  118.             </td>
  119.             <th align="left">Tip</th>
  120.           </tr>
  121.           <tr>
  122.             <td align="left" valign="top">
  123.               <p>
  124.       Check out the Difference option in the Mode menu, where doing the same
  125.       thing (even with full opacity) will result in fantastic swirling
  126.       patterns, changing and adding every time you drag the cursor.
  127.     </p>
  128.             </td>
  129.           </tr>
  130.         </table>
  131.       </div>
  132.       <div class="sect3" lang="en" xml:lang="en">
  133.         <div class="titlepage">
  134.           <div>
  135.             <div>
  136.               <h4 class="title"><a id="id2630239"></a>3.4.1.¬†
  137.       <span lang="en" xml:lang="en">Activate the Tool</span>
  138.     </h4>
  139.             </div>
  140.           </div>
  141.         </div>
  142.         <p>
  143.       There are different possibilities to activate the tool:
  144.     </p>
  145.         <div class="itemizedlist">
  146.           <ul type="disc">
  147.             <li>
  148.               <p>
  149.           From the image-menu:
  150.           <span class="guimenu"><span class="accel">T</span>ools</span> ‚Üí <span class="guisubmenu"><span class="accel">P</span>aint Tools</span> ‚Üí <span class="guimenuitem">Blen<span class="accel">d</span></span>.
  151.         </p>
  152.             </li>
  153.             <li>
  154.               <p>
  155.           By clicking the tool icon
  156.           <span class="guiicon">
  157.             <span class="inlinemediaobject"><img src="../images/toolbox/stock-tool-blend-22.png" /></span>
  158.           </span>.
  159.         </p>
  160.             </li>
  161.             <li>
  162.               <p>
  163.           By clicking on the <span class="keycap"><strong>L</strong></span> keyboard shortcut.
  164.         </p>
  165.             </li>
  166.           </ul>
  167.         </div>
  168.       </div>
  169.       <div class="sect3" lang="en" xml:lang="en">
  170.         <div class="titlepage">
  171.           <div>
  172.             <div>
  173.               <h4 class="title"><a id="id2630341"></a>3.4.2.¬†
  174.       <span lang="en" xml:lang="en">Key modifiers (Defaults)</span>
  175.     </h4>
  176.             </div>
  177.           </div>
  178.         </div>
  179.         <div class="variablelist">
  180.           <dl>
  181.             <dt>
  182.               <span class="term">
  183.           <span lang="en" xml:lang="en">
  184.             <span class="keycap"><strong>Ctrl</strong></span>
  185.           </span>
  186.         </span>
  187.             </dt>
  188.             <dd>
  189.               <p>
  190.             <span class="keycap"><strong>Ctrl</strong></span> is used to create straight lines that are
  191.             constrained to 15 degree absolute angles.
  192.           </p>
  193.             </dd>
  194.           </dl>
  195.         </div>
  196.       </div>
  197.       <div class="sect3" lang="en" xml:lang="en">
  198.         <div class="titlepage">
  199.           <div>
  200.             <div>
  201.               <h4 class="title"><a id="id2630389"></a>3.4.3.¬†
  202.       <span lang="en" xml:lang="en">Options</span>
  203.     </h4>
  204.             </div>
  205.           </div>
  206.         </div>
  207.         <div class="figure">
  208.           <a id="id2630400"></a>
  209.           <p class="title">
  210.             <b>Figure¬†13.49.¬†
  211.         <span lang="en" xml:lang="en">‚Äú<span class="quote">Blend</span>‚Äù tool options</span>
  212.       </b>
  213.           </p>
  214.           <div class="figure-contents">
  215.             <div class="mediaobject">
  216.               <img src="../images/toolbox/blend-tool-options.png" alt="Blend tool options" />
  217.             </div>
  218.           </div>
  219.         </div>
  220.         <br class="figure-break" />
  221.         <p>
  222.       The available tool options can be accessed by double clicking the
  223.       Gradient Tool icon.
  224.       <span class="guiicon">
  225.         <span class="inlinemediaobject"><img src="../images/toolbox/stock-tool-blend-22.png" /></span>
  226.       </span>
  227.     </p>
  228.         <div class="variablelist">
  229.           <dl>
  230.             <dt>
  231.               <span class="term">Mode; Opacity</span>
  232.             </dt>
  233.             <dd>
  234.               <div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
  235.                 <table border="0" summary="Note">
  236.                   <tr>
  237.                     <td rowspan="2" align="center" valign="top" width="25">
  238.                       <img alt="[Note]" src="../images/note.png" />
  239.                     </td>
  240.                     <th align="left">Note</th>
  241.                   </tr>
  242.                   <tr>
  243.                     <td align="left" valign="top">
  244.                       <p>
  245.     See the <a class="link" href="gimp-tools-paint.html#gimp-tool-brush-options" title="3.1.2.¬† Tool Options">Brush Tools Overview</a> for a
  246.     description of tool options that apply to many or all brush tools.
  247.   </p>
  248.                     </td>
  249.                   </tr>
  250.                 </table>
  251.               </div>
  252.             </dd>
  253.             <dt>
  254.               <span class="term">Gradient</span>
  255.             </dt>
  256.             <dd>
  257.               <p>
  258.             A variety of gradient patterns can be selected from the drop-down
  259.             list. The tool causes a shading pattern that transitions from
  260.             foreground to background color or introducing others colors, in
  261.             the direction the user determines by drawing a line in the image.
  262.             For the purposes of drawing the gradient, the
  263.             <span class="guilabel">Reverse</span>
  264.             check-box reverse the gradient direction with the effect, for
  265.             instance, of swapping the foreground and background colors.
  266.           </p>
  267.             </dd>
  268.             <dt>
  269.               <span class="term">Offset</span>
  270.             </dt>
  271.             <dd>
  272.               <p>
  273.             The <span class="guilabel">Offset</span> value permits to increase the
  274.             ‚Äú<span class="quote">slope</span>‚Äù of the gradient. It determines how far
  275.             from the clicked starting point the gradient will begin.
  276.             Shaped forms are not affected by this option.
  277.           </p>
  278.               <div class="figure">
  279.                 <a id="id2630558"></a>
  280.                 <p class="title">
  281.                   <b>Figure¬†13.50.¬†
  282.               <span lang="en" xml:lang="en">
  283.                 ‚Äú<span class="quote">Blend</span>‚Äù tool: Offset example
  284.               </span>
  285.             </b>
  286.                 </p>
  287.                 <div class="figure-contents">
  288.                   <div class="mediaobject">
  289.                     <img src="../images/toolbox/blend-tool-offset.png" alt="Blend tool: Offset example" />
  290.                     <div class="caption">
  291.                       <p>Top, Offset = 0 ; Bottom, Offset = 50%</p>
  292.                     </div>
  293.                   </div>
  294.                 </div>
  295.               </div>
  296.               <br class="figure-break" />
  297.             </dd>
  298.             <dt>
  299.               <span class="term">Shape</span>
  300.             </dt>
  301.             <dd>
  302.               <p>
  303.             The <acronym class="acronym">GIMP</acronym>
  304.             provides 11 shapes, which can be selected from the drop-down list.
  305.             Details on each of the shapes are given below.
  306.           </p>
  307.               <div class="figure">
  308.                 <a id="id2630626"></a>
  309.                 <p class="title">
  310.                   <b>Figure¬†13.51.¬†
  311.               <span lang="en" xml:lang="en">
  312.                 Examples of gradient shapes
  313.               </span>
  314.             </b>
  315.                 </p>
  316.                 <div class="figure-contents">
  317.                   <div class="mediaobject">
  318.                     <img src="../images/tool-options/gradient-linear.png" alt="Examples of gradient shapes" />
  319.                     <div class="caption">
  320.                       <p>Linear</p>
  321.                     </div>
  322.                   </div>
  323.                   <div class="mediaobject">
  324.                     <img src="../images/tool-options/gradient-bilinear.png" alt="Examples of gradient shapes" />
  325.                     <div class="caption">
  326.                       <p>Bi-Linear</p>
  327.                     </div>
  328.                   </div>
  329.                   <div class="mediaobject">
  330.                     <img src="../images/tool-options/gradient-radial.png" alt="Examples of gradient shapes" />
  331.                     <div class="caption">
  332.                       <p>Radial</p>
  333.                     </div>
  334.                   </div>
  335.                 </div>
  336.               </div>
  337.               <br class="figure-break" />
  338.             </dd>
  339.             <dt>
  340.               <span class="term">Linear</span>
  341.             </dt>
  342.             <dd>
  343.               <p>
  344.             This gradient begins with the foreground color at the
  345.             starting point of the drawn line and transitions linearly to
  346.             the background color at the ending point.
  347.           </p>
  348.             </dd>
  349.             <dt>
  350.               <span class="term">Bi-Linear</span>
  351.             </dt>
  352.             <dd>
  353.               <p>
  354.             This shape proceeds in both directions from the starting
  355.             point, for a distance determined by the length of the drawn
  356.             line. It is useful, for example, for giving the appearance
  357.             of a cylinder.
  358.           </p>
  359.             </dd>
  360.             <dt>
  361.               <span class="term">Radial</span>
  362.             </dt>
  363.             <dd>
  364.               <p>
  365.             This gradient gives a circle, with foreground color at the
  366.             center and background color outside the circle. It gives the
  367.             appearance of a sphere without directional lighting.
  368.           </p>
  369.             </dd>
  370.             <dt>
  371.               <span class="term">Square; Shaped</span>
  372.             </dt>
  373.             <dd>
  374.               <div class="figure">
  375.                 <a id="id2630786"></a>
  376.                 <p class="title">
  377.                   <b>Figure¬†13.52.¬†
  378.               <span lang="en" xml:lang="en">
  379.                 Square-shaped gradient examples
  380.               </span>
  381.             </b>
  382.                 </p>
  383.                 <div class="figure-contents">
  384.                   <div class="mediaobject">
  385.                     <img src="../images/tool-options/gradient-square.png" alt="Square-shaped gradient examples" />
  386.                     <div class="caption">
  387.                       <p>Square</p>
  388.                     </div>
  389.                   </div>
  390.                   <div class="mediaobject">
  391.                     <img src="../images/tool-options/gradient-ang-shapeburst.png" alt="Square-shaped gradient examples" />
  392.                     <div class="caption">
  393.                       <p>
  394.                   Shaped (angular)
  395.                 </p>
  396.                     </div>
  397.                   </div>
  398.                   <div class="mediaobject">
  399.                     <img src="../images/tool-options/gradient-spher-shapeburst.png" alt="Square-shaped gradient examples" />
  400.                     <div class="caption">
  401.                       <p>
  402.                   Shaped (spherical)
  403.                 </p>
  404.                     </div>
  405.                   </div>
  406.                   <div class="mediaobject">
  407.                     <img src="../images/tool-options/gradient-dim-shapeburst.png" alt="Square-shaped gradient examples" />
  408.                     <div class="caption">
  409.                       <p>
  410.                   Shaped (dimpled)
  411.                 </p>
  412.                     </div>
  413.                   </div>
  414.                 </div>
  415.               </div>
  416.               <br class="figure-break" />
  417.               <p>
  418.             There are four shapes that are some variant on a
  419.             square: <span class="guilabel">Square</span>,
  420.             <span class="guilabel">Shaped (angular)</span>,
  421.             <span class="guilabel">Shaped (spherical)</span>, and
  422.             <span class="guilabel">Shaped (dimpled)</span>. They all
  423.             put the foreground color at the center of a square,
  424.             whose center is at the start of the drawn line, and
  425.             whose half-diagonal is the length of the drawn line.
  426.             The four options provide a variety in the manner in
  427.             which the gradient is calculated; experimentation is
  428.             the best means of seeing the differences.
  429.           </p>
  430.             </dd>
  431.             <dt>
  432.               <span class="term">Conical (symmetric); Conical (asymmetric)</span>
  433.             </dt>
  434.             <dd>
  435.               <div class="figure">
  436.                 <a id="id2630944"></a>
  437.                 <p class="title">
  438.                   <b>Figure¬†13.53.¬†
  439.               <span lang="en" xml:lang="en">
  440.                 Conical gradient examples
  441.               </span>
  442.             </b>
  443.                 </p>
  444.                 <div class="figure-contents">
  445.                   <div class="mediaobject">
  446.                     <img src="../images/tool-options/gradient-sym-conical.png" alt="Conical gradient examples" />
  447.                     <div class="caption">
  448.                       <p>
  449.                   Conical (symmetrical)
  450.                 </p>
  451.                     </div>
  452.                   </div>
  453.                   <div class="mediaobject">
  454.                     <img src="../images/tool-options/gradient-asym-conical.png" alt="Conical gradient examples" />
  455.                     <div class="caption">
  456.                       <p>
  457.                   Conical (asymmetrical)
  458.                 </p>
  459.                     </div>
  460.                   </div>
  461.                 </div>
  462.               </div>
  463.               <br class="figure-break" />
  464.               <p>
  465.             The <span class="guilabel">Conical (symmetrical)</span> shape
  466.             gives the sensation of looking down at the tip of a
  467.             cone, which appears to be illuminated with the
  468.             background color from a direction determined by the
  469.             direction of the drawn line.
  470.           </p>
  471.               <p>
  472.             <span class="guilabel">Conical (asymmetric)</span> is similar to
  473.             <span class="guilabel">Conical (symmetric)</span> except that
  474.             the "cone" appears to have a ridge where the line is
  475.             drawn.
  476.           </p>
  477.             </dd>
  478.             <dt>
  479.               <span class="term">Spiral (clockwise); Spiral (counterclockwise)</span>
  480.             </dt>
  481.             <dd>
  482.               <div class="figure">
  483.                 <a id="id2631055"></a>
  484.                 <p class="title">
  485.                   <b>Figure¬†13.54.¬†
  486.               <span lang="en" xml:lang="en">Spiral gradient examples</span>
  487.             </b>
  488.                 </p>
  489.                 <div class="figure-contents">
  490.                   <div class="mediaobject">
  491.                     <img src="../images/tool-options/gradient-clock-spiral.png" alt="Spiral gradient examples" />
  492.                     <div class="caption">
  493.                       <p>
  494.                   Spiral (clockwise)
  495.                 </p>
  496.                     </div>
  497.                   </div>
  498.                   <div class="mediaobject">
  499.                     <img src="../images/tool-options/gradient-anticlock-spiral.png" alt="Spiral gradient examples" />
  500.                     <div class="caption">
  501.                       <p>
  502.                   Spiral (counterclockwise)
  503.                 </p>
  504.                     </div>
  505.                   </div>
  506.                 </div>
  507.               </div>
  508.               <br class="figure-break" />
  509.               <p>
  510.             The <span class="guilabel">Spiral</span> shape provide spirals
  511.             whose repeat width is determined by the length of
  512.             the drawn line.
  513.           </p>
  514.             </dd>
  515.             <dt>
  516.               <span class="term">Repeat</span>
  517.             </dt>
  518.             <dd>
  519.               <p>
  520.             There are two repeat modes: <span class="guilabel">Sawtooth Wave</span>
  521.             and <span class="guilabel">Triangular Wave</span>.  The Sawtooth
  522.             pattern is achieved by beginning with the foreground,
  523.             transitioning to the background, then starting over with the
  524.             foreground.  The Triangular starts with the foreground,
  525.             transitions to the background, then transitions back to the
  526.             foreground.
  527.           </p>
  528.             </dd>
  529.             <dt>
  530.               <span class="term">Dithering</span>
  531.             </dt>
  532.             <dd>
  533.               <p>
  534.             Dithering is fully explained in the
  535.             <a class="link" href="glossary.html#glossary-dithering" title="Dithering">Glossary</a>
  536.           </p>
  537.             </dd>
  538.             <dt>
  539.               <span class="term">Adaptive Supersampling</span>
  540.             </dt>
  541.             <dd>
  542.               <p>
  543.             This a more sophisticated means of smoothing the "jagged" effect
  544.             of a sharp transition of color along a slanted or curved line.
  545.             Only tests can allow you to choose.
  546.           </p>
  547.             </dd>
  548.           </dl>
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