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  1. <?xml version="1.0" encoding="UTF-8" standalone="no"?>
  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>3.2.┬áUsing the Channeldialog</title>
  7.     <link rel="stylesheet" href="gimp-help-plain.css" type="text/css" />
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  10.     <link rel="start" href="index.html" title="GIMP User Manual" />
  11.     <link rel="up" href="ch04s03.html" title="3.┬áChannels dialog" />
  12.     <link rel="prev" href="ch04s03.html" title="3.┬áChannels dialog" />
  13.     <link rel="next" href="ch04s03s03.html" title="3.3.┬áChannels Menu" />
  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">3.┬áChannels dialog</th>
  20.         </tr>
  21.         <tr>
  22.           <td width="20%" align="left"><a accesskey="p" href="ch04s03.html">Prev</a>┬á</td>
  23.           <th width="60%" align="center" id="sectionname">3.2.┬áUsing the Channeldialog</th>
  24.           <td width="20%" align="right">┬á<a accesskey="n" href="ch04s03s03.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="id3448760"></a>3.2.┬áUsing the Channeldialog</h3>
  34.           </div>
  35.         </div>
  36.       </div>
  37.       <div class="variablelist">
  38.         <dl>
  39.           <dt>
  40.             <span class="term">Overview</span>
  41.           </dt>
  42.           <dd>
  43.             <p>
  44.             The top channels are the color channels and the optional Alpha
  45.             channel. They are always organized in the same order and they
  46.             cannot be erased. Selection masks are described below and
  47.             displayed as a list in the dialog.  Every channel appears in
  48.             the list in form of a thumbnail.  A right-click in a channel
  49.             thumbnail opens the <a href="ch04s03s03.html" title="3.3.┬áChannels Menu">channel
  50.               menu</a>.
  51.           </p>
  52.           </dd>
  53.           <dt>
  54.             <span class="term">Channel attributes</span>
  55.           </dt>
  56.           <dd>
  57.             <p>
  58.             Every channel is shown in the list with its own attributes. The
  59.             main attribute is the name of the channel itself. You can edit
  60.             selection masks by double-clicking on their name. A
  61.             double_click on the thumbnail opens a full dialog where you can
  62.             also set the visual aspect of the channel in the image window.
  63.             In front of the thumbnail there is an eye icon: 
  64.             <span class="guiicon">
  65.               <span class="inlinemediaobject"><img src="../images/dialogs/dialogs-icon-eye.png" /></span>
  66.             </span>
  67.             by clicking on it you define whether the channel is visible or
  68.             not.  As a result of this visibility, the view of the image
  69.             changes in the image window and a white image becomes yellow if
  70.             you remove the view of the blue because yellow is the
  71.             complementary color for blue.  If you remove the view of the
  72.             Alpha channel, everything becomes transparent and nothing else
  73.             than a grey checkerboard is visible. The aspect of this virtual
  74.             background can be changed in the 
  75.             <a href="ch04s18.html" title="18.┬áPreferences">Preferences</a>.
  76.             The chain icon           
  77.             <span class="guiicon">
  78.               <span class="inlinemediaobject"><img src="../images/dialogs/dialogs-icon-vchain.png" /></span>
  79.             </span>
  80.             enables grouping of channels for operations on multiple channels.
  81.           </p>
  82.             <div class="caution" style="margin-left: 0.5in; margin-right: 0.5in;">
  83.               <table border="0" summary="Caution">
  84.                 <tr>
  85.                   <td rowspan="2" align="center" valign="top" width="25">
  86.                     <img alt="[Caution]" src="../images/caution.png" />
  87.                   </td>
  88.                   <th align="left">Caution</th>
  89.                 </tr>
  90.                 <tr>
  91.                   <td colspan="2" align="left" valign="top">
  92.                     <p>
  93.           Activated channels appear highlighted in blue in the dialog.
  94.           If you click on a channel in the list you toggle activation
  95.           of the corresponding channel.  Disabling a color channel red,
  96.           blue, or green has severe consequencies. For instance if you
  97.           disable the blue channel, all pixels from now on added to the
  98.           image will not have blue component, and so a white pixel will
  99.           have the yellow complementary color.
  100.         </p>
  101.                   </td>
  102.                 </tr>
  103.               </table>
  104.             </div>
  105.           </dd>
  106.           <dt>
  107.             <span class="term">Managing channels</span>
  108.           </dt>
  109.           <dd>
  110.             <p>
  111.             Under the channel list is a set of buttons allowing you to
  112.             perform some basic operations on channel list.
  113.           </p>
  114.             <p>
  115.             </p>
  116.             <div class="itemizedlist">
  117.               <ul type="disc">
  118.                 <li>
  119.                   <p>
  120.                   <span class="inlinemediaobject"><img src="../images/dialogs/dialogs-icon-edit.png" /></span>
  121.                   <a id="gimp-channel-edit"></a>
  122.                   <span class="guilabel">Edit channel attributes</span>, only
  123.                   available for selection masks. Here you can change the
  124.                   <span class="guilabel">Channel name</span>.  The other two
  125.                   parameters affect channel is visibility in the image
  126.                   window; they control <span class="guilabel">Opacity</span> and
  127.                   color used for the mask in the image window.  A click on
  128.                   the color button displays the Gimp color selector and
  129.                   then you can change the mask color.
  130.                 </p>
  131.                 </li>
  132.                 <li>
  133.                   <p>
  134.                   <span class="inlinemediaobject"><img src="../images/dialogs/dialogs-icon-new.png" /></span>
  135.                   <a id="gimp-channel-new"></a>
  136.                   <span class="guilabel">New channel</span>: you can create here a
  137.                   new channel available to save a selection.  Displayed
  138.                   dialog lets you change <span class="guilabel">Opacity</span> and
  139.                   mask color used in the image to represent the selection.
  140.                 </p>
  141.                 </li>
  142.                 <li>
  143.                   <p>
  144.                   <span class="inlinemediaobject"><img src="../images/dialogs/dialogs-icon-raise.png" /></span>
  145.                   <a id="gimp-channel-raise"></a>
  146.                   <span class="guilabel">Raise channel</span>, only available for
  147.                   selection masks : you can here put the channel up a level
  148.                   in the list.  Press <span><b class="keycap">Shift</b></span> key to move
  149.                   channel to top of the list.
  150.                 </p>
  151.                 </li>
  152.                 <li>
  153.                   <p>
  154.                   <span class="inlinemediaobject"><img src="../images/dialogs/dialogs-icon-lower.png" /></span>
  155.                   <a id="gimp-channel-lower"></a>
  156.                   <span class="guilabel">Lower channel</span>:
  157.                   You can here put the channel down a level in the list.
  158.                   Press the <span><b class="keycap">Shift</b></span> key to move the channel
  159.                   to bottom of the list.
  160.                 </p>
  161.                 </li>
  162.                 <li>
  163.                   <p>
  164.                   <span class="inlinemediaobject"><img src="../images/dialogs/dialogs-icon-duplicate.png" /></span>
  165.                   <a id="gimp-channel-duplicate"></a>
  166.                   <span class="guilabel">Duplicate channel</span>: You can create
  167.                   here a copy of the active channel. Name of new channel is
  168.                   suffixed with a number.
  169.                 </p>
  170.                   <div class="tip" style="margin-left: 0.5in; margin-right: 0.5in;">
  171.                     <table border="0" summary="Tip">
  172.                       <tr>
  173.                         <td rowspan="2" align="center" valign="top" width="25">
  174.                           <img alt="[Tip]" src="../images/tip.png" />
  175.                         </td>
  176.                         <th align="left">Tip</th>
  177.                       </tr>
  178.                       <tr>
  179.                         <td colspan="2" align="left" valign="top">
  180.                           <p>
  181.                     You can also duplicate a color channel or the Alpha
  182.                     channel.  It's an easy way to keep a copy of them and to
  183.                     use them later as a selection in an image.
  184.                   </p>
  185.                         </td>
  186.                       </tr>
  187.                     </table>
  188.                   </div>
  189.                 </li>
  190.                 <li>
  191.                   <p>
  192.                   <span class="inlinemediaobject"><img src="../images/dialogs/dialogs-icon-delete.png" /></span>
  193.                   <a id="gimp-channel-selection-delete"></a> 
  194.                   <span class="guilabel">Delete channel</span>,only available for
  195.                   selection masks: you can here delete the active channel.
  196.                 </p>
  197.                 </li>
  198.                 <li>
  199.                   <p>
  200.                   <span class="inlinemediaobject"><img src="../images/dialogs/dialogs-icon-selection.png" /></span>
  201.                   <a id="gimp-channel-selection-replace"></a>
  202.                   <span class="guilabel">Channel to selection</span>: here you can
  203.                   transform the channel to become a selection. By default
  204.                   the selection derived from a channel replaces any
  205.                   previous active selection. It's possible to change this
  206.                   by clicking on control keys.
  207.                   </p>
  208.                   <div class="itemizedlist">
  209.                     <ul type="circle">
  210.                       <li>
  211.                         <p>
  212.                         <a id="gimp-channel-selection-add"></a>
  213.                         <span><b class="keycap">Shift</b></span>: the selection derived from a
  214.                         channel is added to the previous active selection.
  215.                         The final selection is merged from both.
  216.                       </p>
  217.                       </li>
  218.                       <li>
  219.                         <p>
  220.                         <a id="gimp-channel-selection-subtract"></a>
  221.                         <span><b class="keycap">Ctrl</b></span>: the final selection is the
  222.                         substraction of selection derived from a channel from
  223.                         the previously active one.
  224.                       </p>
  225.                       </li>
  226.                       <li>
  227.                         <p>
  228.                         <a id="gimp-channel-selection-intersect"></a>
  229.                         <span><b class="keycap">Shift Ctrl</b></span>: the final selection is
  230.                         the intersection of selection derived from a channel
  231.                         with the previously active one. Only common parts are
  232.                         kept. 
  233.                       </p>
  234.                       </li>
  235.                     </ul>
  236.                   </div>
  237.                   <p>
  238.                 </p>
  239.                 </li>
  240.               </ul>
  241.             </div>
  242.             <p>
  243.           </p>
  244.           </dd>
  245.         </dl>
  246.       </div>
  247.     </div>
  248.     <div class="navfooter">
  249.       <hr />
  250.       <table width="100%" summary="Navigation footer">
  251.         <tr>
  252.           <td width="40%" align="left"><a accesskey="p" href="ch04s03.html">Prev</a>┬á</td>
  253.           <td width="20%" align="center">
  254.             <a accesskey="u" href="ch04s03.html">Up</a>
  255.           </td>
  256.           <td width="40%" align="right">┬á<a accesskey="n" href="ch04s03s03.html">Next</a></td>
  257.         </tr>
  258.         <tr>
  259.           <td width="40%" align="left" valign="top">3.┬áChannels dialog┬á</td>
  260.           <td width="20%" align="center">
  261.             <a accesskey="h" href="index.html">Home</a>
  262.           </td>
  263.           <td width="40%" align="right" valign="top">┬á3.3.┬áChannels Menu</td>
  264.         </tr>
  265.       </table>
  266.     </div>
  267.   </body>
  268. </html>
  269.