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  • Committer: Bazaar Package Importer
  • Author(s): Ari Pollak
  • Date: 2005-05-08 18:04:08 UTC
  • mfrom: (1.2.1 upstream) (2.1.1 hoary)
  • Revision ID: james.westby@ubuntu.com-20050508180408-mjwl3kmjczfnmu5v
Tags: 2+0.7-5
http://bugs.debian.org/308228
Fix doc-base entry for gimp-help-zh-cn to point to correct directory
name (Closes: #308228)

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html/en/ch05s07s05.html
 
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
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<html xmlns="http://www.w3.org/1999/xhtml">
 
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  <head>
 
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    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
 
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    <title>7.5. Transparency</title>
 
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    <link rel="stylesheet" href="gimp-help-plain.css" type="text/css" />
 
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    <link rel="stylesheet" href="gimp-help-screen.css" type="text/css" />
 
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    <meta name="generator" content="DocBook XSL Stylesheets V1.66.1" />
 
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    <link rel="start" href="index.html" title="&#10;      &#10;    " />
 
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    <link rel="up" href="ch05s07.html" title="7. Layers" />
 
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    <link rel="prev" href="ch05s07s04.html" title="7.4. Mask" />
 
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    <link rel="next" href="ch05s07s06.html" title="7.6. Transform" />
 
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  </head>
 
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  <body>
 
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    <div xmlns="" class="navheader">
 
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      <table width="100%" summary="Navigation header">
 
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        <tr>
 
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          <th colspan="3" align="center" id="chaptername">7.5. Transparency</th>
 
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        </tr>
 
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        <tr>
 
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          <td width="20%" align="left"><a accesskey="p" href="ch05s07s04.html">Prev</a> </td>
 
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          <th width="60%" align="center" id="sectionname">7.5. Transparency</th>
 
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          <td width="20%" align="right"> <a accesskey="n" href="ch05s07s06.html">Next</a></td>
 
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        </tr>
 
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      </table>
 
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      <hr />
 
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    </div>
 
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    <div class="sect2" lang="en" xml:lang="en">
 
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      <div class="titlepage">
 
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        <div>
 
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          <div>
 
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            <h3 class="title"><a id="gimp-layer-transparency-menu"></a>7.5. Transparency</h3>
 
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          </div>
 
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        </div>
 
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      </div>
 
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      <div class="informalfigure">
 
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        <div class="mediaobject">
 
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          <img src="../images/menus/menus-layer-transparency.png" />
 
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          <div class="caption">
 
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            <p>
 
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        The Transparency submenu of the Layer menu
 
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      </p>
 
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          </div>
 
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        </div>
 
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      </div>
 
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      <p>
 
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    The Transparency submenu of the Layers menu contains operations that
 
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    use or affect the alpha channel of the active layer. 
 
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  </p>
 
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      <div class="simplesect" lang="en" xml:lang="en">
 
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        <div class="titlepage">
 
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          <div>
 
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            <div>
 
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              <h4 class="title"><a id="gimp-layer-alpha-add"></a>Add Alpha Channel</h4>
 
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            </div>
 
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          </div>
 
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        </div>
 
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        <p>
 
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      This command can be accessed from an image menubar as 
 
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      <span class="guimenu">Layer</span>-&gt;<span class="guisubmenu">Transparency</span>-&gt;<span class="guimenuitem">Add alpha Channel</span>.
 
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    </p>
 
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        <p>   
 
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      "Add Alpha Channel" adds an alpha channel to the active layer.
 
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      Without an alpha channel, a layer cannot have transparency or a layer
 
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      mask.  If the active layer already has an alpha channel (and unless it 
 
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      is the bottom layer of the image, it must), then the menu entry will 
 
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      be insensitive.
 
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    </p>
 
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      </div>
 
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      <div class="simplesect" lang="en" xml:lang="en">
 
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        <div class="titlepage">
 
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          <div>
 
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            <div>
 
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              <h4 class="title"><a id="id3354950"></a>Color to Alpha</h4>
 
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            </div>
 
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          </div>
 
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        </div>
 
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        <p>
 
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      This menu entry, accessed from an image menubar as 
 
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      <span class="guimenu">Layer</span>-&gt;<span class="guisubmenu">Transparency</span>-&gt;<span class="guimenuitem">Color to Alpha</span>, is an alternative way to activate the <a href="ch06s03s14.html" title="3.14. Color to Alpha">Color to Alpha</a> filter.
 
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    </p>
 
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      </div>
 
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      <div class="simplesect" lang="en" xml:lang="en">
 
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        <div class="titlepage">
 
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          <div>
 
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            <div>
 
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              <h4 class="title"><a id="id3354953"></a>Semi-flatten</h4>
 
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            </div>
 
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          </div>
 
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        </div>
 
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        <p>
 
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      This menu entry, accessed from an image menubar as 
 
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      <span class="guimenu">Layer</span>-&gt;<span class="guisubmenu">Transparency</span>-&gt;<span class="guimenuitem">Semi-flatten</span>, is an alternative way to activate the <a href="ch06s03s20.html" title="3.20. Semi-Flatten">Semi-flatten</a> filter.
 
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    </p>
 
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      </div>
 
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      <div class="simplesect" lang="en" xml:lang="en">
 
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        <div class="titlepage">
 
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          <div>
 
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            <div>
 
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              <h4 class="title"><a id="plug-in-threshold-alpha"></a>Threshold Alpha</h4>
 
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            </div>
 
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          </div>
 
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        </div>
 
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        <div class="informalfigure">
 
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          <div class="mediaobject">
 
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            <img src="../images/menus/dialogs-threshold-alpha.png" />
 
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            <div class="caption">
 
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              <p>
 
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          The "Threshold Alpha" dialog
 
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        </p>
 
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            </div>
 
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          </div>
 
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        </div>
 
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        <p>
 
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      This operation can be accessed from an image menubar as 
 
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      <span class="guimenu">Layer</span>-&gt;<span class="guisubmenu">Transparency</span>-&gt;<span class="guimenuitem">Threshold Alpha</span>.
 
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    </p>
 
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        <p>
 
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      "Threshold Alpha" converts partial transparency into all-or-none
 
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      transparency, by applying a user-specified cutoff threshold to
 
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      the layer's alpha channel.  It only works on
 
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      alpha-channel-posessing layers from RGB images:  if the image is
 
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      Grayscale or Indexed, or the layer lacks an alpha channel, the
 
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      menu entry will be insensitive.  If "Keep transparency" has been
 
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      toggled on in the Layers dialog, the command will show an error
 
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      message and refuse to operate.
 
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    </p>
 
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      </div>
 
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      <div class="simplesect" lang="en" xml:lang="en">
 
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        <div class="titlepage">
 
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          <div>
 
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            <div>
 
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              <h4 class="title"><a id="gimp-layer-alpha-selection-replace"></a>Alpha to Selection [or Add, Subtract, Intersect]</h4>
 
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            </div>
 
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          </div>
 
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        </div>
 
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        <a id="gimp-layer-alpha-selection-add"></a>
 
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        <a id="gimp-layer-alpha-selection-subtract"></a>
 
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        <a id="gimp-layer-alpha-selection-intersect"></a>
 
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        <p>
 
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      These commands can be accessed from an image menubar as 
 
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      <span class="guimenu">Layer</span>-&gt;<span class="guisubmenu">Transparency</span>,
 
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      followed by <span class="guimenuitem">Alpha to Selection</span>,
 
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      <span class="guimenuitem">Add to Selection</span>, 
 
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      <span class="guimenuitem">Subtract from Selection</span>, or
 
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      <span class="guimenuitem">Intersection with Selection</span>. 
 
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    </p>
 
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        <p>   
 
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      "Alpha to Selection" transforms the active layer's alpha channel
 
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      (which encodes transparency) into the image's selection.  Opaque
 
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      areas become fully selected, transparent areas unselected, and
 
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      translucent areas partially selected.  The other
 
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      operations in this group do similar things, except that instead
 
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      of completely replacing the existing selection with the
 
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      selection produced from the alpha channel, they either add the two
 
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      selections, subtract the alpha-selection from the existing
 
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      selection, or create a selection that is the intersection of the
 
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      two. 
 
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    </p>
 
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      </div>
 
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    </div>
 
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    <div class="navfooter">
 
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      <hr />
 
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      <table width="100%" summary="Navigation footer">
 
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        <tr>
 
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          <td width="40%" align="left"><a accesskey="p" href="ch05s07s04.html">Prev</a> </td>
 
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          <td width="20%" align="center">
 
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            <a accesskey="u" href="ch05s07.html">Up</a>
 
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          </td>
 
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          <td width="40%" align="right"> <a accesskey="n" href="ch05s07s06.html">Next</a></td>
 
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        </tr>
 
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        <tr>
 
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          <td width="40%" align="left" valign="top">7.4. Mask </td>
 
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          <td width="20%" align="center">
 
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            <a accesskey="h" href="index.html">Home</a>
 
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          </td>
 
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          <td width="40%" align="right" valign="top"> 7.6. Transform</td>
 
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        </tr>
 
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      </table>
 
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    </div>
 
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  </body>
 
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</html>