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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">
  3. <html xmlns="http://www.w3.org/1999/xhtml">
  4.   <head>
  5.     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
  6.     <title>7.5.┬áTransparency</title>
  7.     <link rel="stylesheet" href="gimp-help-plain.css" type="text/css" />
  8.     <link rel="stylesheet" href="gimp-help-screen.css" type="text/css" />
  9.     <meta name="generator" content="DocBook XSL Stylesheets V1.66.1" />
  10.     <link rel="start" href="index.html" title="GIMP User Manual" />
  11.     <link rel="up" href="ch05s07.html" title="7.┬áLayers" />
  12.     <link rel="prev" href="ch05s07s04.html" title="7.4.┬áMask" />
  13.     <link rel="next" href="ch05s07s06.html" title="7.6.┬áTransform" />
  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">7.┬áLayers</th>
  20.         </tr>
  21.         <tr>
  22.           <td width="20%" align="left"><a accesskey="p" href="ch05s07s04.html">Prev</a>┬á</td>
  23.           <th width="60%" align="center" id="sectionname">7.5.┬áTransparency</th>
  24.           <td width="20%" align="right">┬á<a accesskey="n" href="ch05s07s06.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-layer-transparency-menu"></a>7.5.┬áTransparency</h3>
  34.           </div>
  35.         </div>
  36.       </div>
  37.       <div class="informalfigure">
  38.         <div class="mediaobject">
  39.           <img src="../images/menus/menus-layer-transparency.png" />
  40.           <div class="caption">
  41.             <p>
  42.         The Transparency submenu of the Layer menu
  43.       </p>
  44.           </div>
  45.         </div>
  46.       </div>
  47.       <p>
  48.     The Transparency submenu of the Layers menu contains operations that
  49.     use or affect the alpha channel of the active layer. 
  50.   </p>
  51.       <div class="simplesect" lang="en" xml:lang="en">
  52.         <div class="titlepage">
  53.           <div>
  54.             <div>
  55.               <h4 class="title"><a id="gimp-layer-alpha-add"></a>Add Alpha Channel</h4>
  56.             </div>
  57.           </div>
  58.         </div>
  59.         <p>
  60.       This command can be accessed from an image menubar as 
  61.       <span class="guimenu">Layer</span>-><span class="guisubmenu">Transparency</span>-><span class="guimenuitem">Add alpha Channel</span>.
  62.     </p>
  63.         <p>   
  64.       "Add Alpha Channel" adds an alpha channel to the active layer.
  65.       Without an alpha channel, a layer cannot have transparency or a layer
  66.       mask.  If the active layer already has an alpha channel (and unless it 
  67.       is the bottom layer of the image, it must), then the menu entry will 
  68.       be insensitive.
  69.     </p>
  70.       </div>
  71.       <div class="simplesect" lang="en" xml:lang="en">
  72.         <div class="titlepage">
  73.           <div>
  74.             <div>
  75.               <h4 class="title"><a id="id3470501"></a>Color to Alpha</h4>
  76.             </div>
  77.           </div>
  78.         </div>
  79.         <p>
  80.       This menu entry, accessed from an image menubar as 
  81.       <span class="guimenu">Layer</span>-><span class="guisubmenu">Transparency</span>-><span class="guimenuitem">Color to Alpha</span>, is an alternative way to activate the <a href="ch06s03s14.html" title="3.14.┬áColor to Alpha">Color to Alpha</a> filter.
  82.     </p>
  83.       </div>
  84.       <div class="simplesect" lang="en" xml:lang="en">
  85.         <div class="titlepage">
  86.           <div>
  87.             <div>
  88.               <h4 class="title"><a id="id3470542"></a>Semi-flatten</h4>
  89.             </div>
  90.           </div>
  91.         </div>
  92.         <p>
  93.       This menu entry, accessed from an image menubar as 
  94.       <span class="guimenu">Layer</span>-><span class="guisubmenu">Transparency</span>-><span class="guimenuitem">Semi-flatten</span>, is an alternative way to activate the <a href="ch06s03s20.html" title="3.20.┬áSemi-Flatten">Semi-flatten</a> filter.
  95.     </p>
  96.       </div>
  97.       <div class="simplesect" lang="en" xml:lang="en">
  98.         <div class="titlepage">
  99.           <div>
  100.             <div>
  101.               <h4 class="title"><a id="plug-in-threshold-alpha"></a>Threshold Alpha</h4>
  102.             </div>
  103.           </div>
  104.         </div>
  105.         <div class="informalfigure">
  106.           <div class="mediaobject">
  107.             <img src="../images/menus/dialogs-threshold-alpha.png" />
  108.             <div class="caption">
  109.               <p>
  110.           The "Threshold Alpha" dialog
  111.         </p>
  112.             </div>
  113.           </div>
  114.         </div>
  115.         <p>
  116.       This operation can be accessed from an image menubar as 
  117.       <span class="guimenu">Layer</span>-><span class="guisubmenu">Transparency</span>-><span class="guimenuitem">Threshold Alpha</span>.
  118.     </p>
  119.         <p>
  120.       "Threshold Alpha" converts partial transparency into all-or-none
  121.       transparency, by applying a user-specified cutoff threshold to
  122.       the layer's alpha channel.  It only works on
  123.       alpha-channel-posessing layers from RGB images:  if the image is
  124.       Grayscale or Indexed, or the layer lacks an alpha channel, the
  125.       menu entry will be insensitive.  If "Keep transparency" has been
  126.       toggled on in the Layers dialog, the command will show an error
  127.       message and refuse to operate.
  128.     </p>
  129.       </div>
  130.       <div class="simplesect" lang="en" xml:lang="en">
  131.         <div class="titlepage">
  132.           <div>
  133.             <div>
  134.               <h4 class="title"><a id="gimp-layer-alpha-selection-replace"></a>Alpha to Selection [or Add, Subtract, Intersect]</h4>
  135.             </div>
  136.           </div>
  137.         </div>
  138.         <a id="gimp-layer-alpha-selection-add"></a>
  139.         <a id="gimp-layer-alpha-selection-subtract"></a>
  140.         <a id="gimp-layer-alpha-selection-intersect"></a>
  141.         <p>
  142.       These commands can be accessed from an image menubar as 
  143.       <span class="guimenu">Layer</span>-><span class="guisubmenu">Transparency</span>,
  144.       followed by <span class="guimenuitem">Alpha to Selection</span>,
  145.       <span class="guimenuitem">Add to Selection</span>, 
  146.       <span class="guimenuitem">Subtract from Selection</span>, or
  147.       <span class="guimenuitem">Intersection with Selection</span>. 
  148.     </p>
  149.         <p>   
  150.       "Alpha to Selection" transforms the active layer's alpha channel
  151.       (which encodes transparency) into the image's selection.  Opaque
  152.       areas become fully selected, transparent areas unselected, and
  153.       translucent areas partially selected.  The other
  154.       operations in this group do similar things, except that instead
  155.       of completely replacing the existing selection with the
  156.       selection produced from the alpha channel, they either add the two
  157.       selections, subtract the alpha-selection from the existing
  158.       selection, or create a selection that is the intersection of the
  159.       two. 
  160.     </p>
  161.       </div>
  162.     </div>
  163.     <div class="navfooter">
  164.       <hr />
  165.       <table width="100%" summary="Navigation footer">
  166.         <tr>
  167.           <td width="40%" align="left"><a accesskey="p" href="ch05s07s04.html">Prev</a>┬á</td>
  168.           <td width="20%" align="center">
  169.             <a accesskey="u" href="ch05s07.html">Up</a>
  170.           </td>
  171.           <td width="40%" align="right">┬á<a accesskey="n" href="ch05s07s06.html">Next</a></td>
  172.         </tr>
  173.         <tr>
  174.           <td width="40%" align="left" valign="top">7.4.┬áMask┬á</td>
  175.           <td width="20%" align="center">
  176.             <a accesskey="h" href="index.html">Home</a>
  177.           </td>
  178.           <td width="40%" align="right" valign="top">┬á7.6.┬áTransform</td>
  179.         </tr>
  180.       </table>
  181.     </div>
  182.   </body>
  183. </html>
  184.