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  6.     <title>11.16.¬† Decompose</title>
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  19.       <table width="100%" summary="Navigation header">
  20.         <tr>
  21.           <th colspan="3" align="center">11.16.¬†
  22.     
  23.     <span lang="en" xml:lang="en">Decompose</span>
  24.   </th>
  25.         </tr>
  26.         <tr>
  27.           <td width="20%" align="left"><a accesskey="p" href="plug-in-compose.html"><img src="../images/prev.png" alt="Prev" /></a>¬†</td>
  28.           <th width="60%" align="center">11.¬†
  29.     <span lang="en" xml:lang="en">The ‚Äú<span class="quote">Colors</span>‚Äù Menu</span>
  30.   </th>
  31.           <td width="20%" align="right">¬†<a accesskey="n" href="plug-in-recompose.html"><img src="../images/next.png" alt="Next" /></a></td>
  32.         </tr>
  33.       </table>
  34.       <hr />
  35.     </div>
  36.     <div class="sect2" lang="en" xml:lang="en">
  37.       <div class="titlepage">
  38.         <div>
  39.           <div>
  40.             <h3 class="title"><a id="plug-in-decompose-registered"></a>11.16.¬†
  41.     <a id="plug-in-decompose"></a>
  42.     <span lang="en" xml:lang="en">Decompose</span>
  43.   </h3>
  44.           </div>
  45.           <div>
  46.             <div class="revhistory">
  47.               <table border="1" width="100%" summary="Revision history">
  48.                 <tr>
  49.                   <th align="left" valign="top" colspan="3">
  50.                     <b>Revision History</b>
  51.                   </th>
  52.                 </tr>
  53.                 <tr>
  54.                   <td align="left">Revision $Revision: 2395 $</td>
  55.                   <td align="left">2007-11-24</td>
  56.                   <td align="left">j.h</td>
  57.                 </tr>
  58.               </table>
  59.             </div>
  60.           </div>
  61.         </div>
  62.       </div>
  63.       <a id="id2720272" class="indexterm"></a>
  64.       <a id="id2720281" class="indexterm"></a>
  65.       <a id="id2720289" class="indexterm"></a>
  66.       <a id="id2720298" class="indexterm"></a>
  67.       <a id="id2720306" class="indexterm"></a>
  68.       <a id="id2720315" class="indexterm"></a>
  69.       <a id="id2720333" class="indexterm"></a>
  70.       <a id="id2720342" class="indexterm"></a>
  71.       <a id="id2720351" class="indexterm"></a>
  72.       <a id="id2720360" class="indexterm"></a>
  73.       <div class="sect3" lang="en" xml:lang="en">
  74.         <div class="titlepage">
  75.           <div>
  76.             <div>
  77.               <h4 class="title"><a id="id2720368"></a>11.16.1.¬†
  78.       <span lang="en" xml:lang="en">Overview</span>
  79.     </h4>
  80.             </div>
  81.           </div>
  82.         </div>
  83.         <div class="figure">
  84.           <a id="id2720379"></a>
  85.           <p class="title">
  86.             <b>Figure¬†15.159.¬†
  87.         <span lang="en" xml:lang="en">Decomposition to images (RGB)</span>
  88.       </b>
  89.           </p>
  90.           <div class="figure-contents">
  91.             <div class="mediaobject">
  92.               <img src="../images/menus/taj_orig_2.png" alt="Decomposition to images (RGB)" />
  93.               <div class="caption">
  94.                 <p>Original image</p>
  95.               </div>
  96.             </div>
  97.             <div class="mediaobject">
  98.               <img src="../images/menus/decompose-ex1.png" alt="Decomposition to images (RGB)" />
  99.               <div class="caption">
  100.                 <p>
  101.             Command ‚Äú<span class="quote">Decompose</span>‚Äù applied (RGB decomposition) with
  102.             <span class="guilabel">Decompose to layers</span> unchecked.
  103.           </p>
  104.               </div>
  105.             </div>
  106.           </div>
  107.         </div>
  108.         <br class="figure-break" />
  109.         <div class="figure">
  110.           <a id="id2720452"></a>
  111.           <p class="title">
  112.             <b>Figure¬†15.160.¬†
  113.         <span lang="en" xml:lang="en">Decomposition to layers (RVB)</span>
  114.       </b>
  115.           </p>
  116.           <div class="figure-contents">
  117.             <div class="mediaobject">
  118.               <img src="../images/menus/taj_orig_2.png" alt="Decomposition to layers (RVB)" />
  119.               <div class="caption">
  120.                 <p>Original image</p>
  121.               </div>
  122.             </div>
  123.             <div class="mediaobject">
  124.               <img src="../images/menus/decompose-ex2.png" alt="Decomposition to layers (RVB)" />
  125.               <div class="caption">
  126.                 <p>
  127.             Command ‚Äú<span class="quote">Decompose</span>‚Äù applied (RGB decomposition) with
  128.             <span class="guilabel">Decompose to layers</span> checked.
  129.           </p>
  130.               </div>
  131.             </div>
  132.           </div>
  133.         </div>
  134.         <br class="figure-break" />
  135.         <p>
  136.       This command separates the channels (RGB, HSV, CMYK...) of an image
  137.       into separated images or layers.
  138.     </p>
  139.       </div>
  140.       <div class="sect3" lang="en" xml:lang="en">
  141.         <div class="titlepage">
  142.           <div>
  143.             <div>
  144.               <h4 class="title"><a id="id2720534"></a>11.16.2.¬†
  145.       <span lang="en" xml:lang="en">Activate the command</span>
  146.     </h4>
  147.             </div>
  148.           </div>
  149.         </div>
  150.         <div class="itemizedlist">
  151.           <ul type="disc">
  152.             <li>
  153.               <p>
  154.           You can find this command in the image window menu under
  155.           <span class="guimenu">Colors</span> ‚Üí <span class="guisubmenu">Components</span> ‚Üí <span class="guimenuitem"><span class="accel">D</span>ecompose‚Ķ</span>.
  156.         </p>
  157.             </li>
  158.           </ul>
  159.         </div>
  160.       </div>
  161.       <div class="sect3" lang="en" xml:lang="en">
  162.         <div class="titlepage">
  163.           <div>
  164.             <div>
  165.               <h4 class="title"><a id="id2720586"></a>11.16.3.¬†
  166.       <span lang="en" xml:lang="en">Options</span>
  167.     </h4>
  168.             </div>
  169.           </div>
  170.         </div>
  171.         <div class="figure">
  172.           <a id="id2720597"></a>
  173.           <p class="title">
  174.             <b>Figure¬†15.161.¬†
  175.         <span lang="en" xml:lang="en">
  176.           ‚Äú<span class="quote">Decompose</span>‚Äù command options
  177.         </span>
  178.       </b>
  179.           </p>
  180.           <div class="figure-contents">
  181.             <div class="mediaobject">
  182.               <img src="../images/menus/colors-components-decompose.png" alt="Decompose command options" />
  183.             </div>
  184.           </div>
  185.         </div>
  186.         <br class="figure-break" />
  187.         <div class="variablelist">
  188.           <p class="title">
  189.             <b>
  190.         <span lang="en" xml:lang="en">Extract Channels</span>
  191.       </b>
  192.           </p>
  193.           <p>
  194.         Following options are described with
  195.         <a class="link" href="plug-in-decompose-registered.html#plug-in-decompose-to-layers">Decompose to
  196.         layers</a> checked.
  197.       </p>
  198.           <dl>
  199.             <dt>
  200.               <span class="term">
  201.           <span lang="en" xml:lang="en">Color model</span>
  202.         </span>
  203.             </dt>
  204.             <dd>
  205.               <div class="variablelist">
  206.                 <dl>
  207.                   <dt>
  208.                     <span class="term">RGB</span>
  209.                   </dt>
  210.                   <dd>
  211.                     <p>
  212.                   If the RGB radio button is clicked, a grey level image is
  213.                   created with three layers (Red, Green and Blue), and two
  214.                   channels (Grey and Alpha).
  215.                 </p>
  216.                     <p>
  217.                   This function is interesting when using Threshold tool. You
  218.                   can also perform operations like cutting, pasting or moving
  219.                   selections in a single RBG channel. You can use an
  220.                   extracted grayscale as a selection or mask by saving it in
  221.                   a channel (right-click>Select>Save to a channel).
  222.                 </p>
  223.                   </dd>
  224.                   <dt>
  225.                     <span class="term">RGBA</span>
  226.                   </dt>
  227.                   <dd>
  228.                     <p>
  229.                   If the RGBA radio button is clicked, a image is created
  230.                   similar at the RGB Decomposing with a additional Alpha
  231.                   layer filled with the transparencies values of the source
  232.                   image. Full transparent pixels are black and the full
  233.                   opaque pixels are white.
  234.                 </p>
  235.                   </dd>
  236.                   <dt>
  237.                     <span class="term">HSV</span>
  238.                   </dt>
  239.                   <dd>
  240.                     <p>
  241.                   This option decomposes image into three greyscaled layers,
  242.                   one for Hue, one for Saturation and another for Value.
  243.                 </p>
  244.                     <p>
  245.                   Although <span class="guilabel">Hue</span> is greyscaled, it does
  246.                   represent hues. In color circle, white and black are
  247.                   starting and arrival points and are superimposed. They
  248.                   represent Red color at top of circle. Grey intermediate
  249.                   levels are corresponding to intermediate hues on circle:
  250.                   dark grey to orange, mid grey to green and light grey to
  251.                   magenta.
  252.                 </p>
  253.                     <p>
  254.                   <span class="guilabel">Saturation</span> and
  255.                   <span class="guilabel">Value</span>: White is maximum Saturation
  256.                   (pure color) and maximum Value (very bright). Black is
  257.                   minimum Saturation (white) and minimum Value (black).
  258.                 </p>
  259.                   </dd>
  260.                   <dt>
  261.                     <span class="term">HSL</span>
  262.                   </dt>
  263.                   <dd>
  264.                     <p>
  265.                   This option is similar to <span class="guilabel">HSV</span>. Instead
  266.                   of the <span class="emphasis"><em>V</em></span>alue, the third layer contains
  267.                   the image's <span class="emphasis"><em>L</em></span> component.
  268.                 </p>
  269.                   </dd>
  270.                   <dt>
  271.                     <span class="term">CMY</span>
  272.                   </dt>
  273.                   <dd>
  274.                     <p>
  275.                   This option decomposes image into three greyscaled layers,
  276.                   one for Yellow, one for Magenta and another for Cyan.
  277.                 </p>
  278.                     <p>
  279.                   This option might be useful to transfer image into printing
  280.                   softwares with CMY capabilities.
  281.                 </p>
  282.                   </dd>
  283.                   <dt>
  284.                     <span class="term">CMYK</span>
  285.                   </dt>
  286.                   <dd>
  287.                     <p>
  288.                   This option is similar at the <span class="guilabel">CMY Decomposing
  289.                   </span> with an additional layer for Black.
  290.                 </p>
  291.                     <p>
  292.                   This option might be useful to transfer image into printing
  293.                   softwares with CMYK capabilities.
  294.                 </p>
  295.                   </dd>
  296.                   <dt>
  297.                     <span class="term">Alpha</span>
  298.                   </dt>
  299.                   <dd>
  300.                     <p>
  301.                   This option extracts the image transparency stored in the
  302.                   Alpha channel in <a class="link" href="gimp-channel-dialog.html" title="2.2.¬† Channels Dialog">Channel dialog</a>
  303.                   in a separate image. The full transparent pixels are Black
  304.                   the full opaque pixels are white. The graytones are smooth
  305.                   transitions of the transparency in the source image.
  306.                 </p>
  307.                   </dd>
  308.                   <dt>
  309.                     <span class="term">LAB</span>
  310.                   </dt>
  311.                   <dd>
  312.                     <p>
  313.                   This option decomposes image into three greyscaled layers,
  314.                   layer ‚Äú<span class="quote">L</span>‚Äù for Luminance, layer
  315.                   ‚Äú<span class="quote">A</span>‚Äù for colors between green and red, layer
  316.                   ‚Äú<span class="quote">B</span>‚Äù for colors between blue and yellow.
  317.                 </p>
  318.                     <p>
  319.                   The LAB Decomposing is a color model of the Luminance-Color
  320.                   family. A channel is used for the Luminosity while two other
  321.                   channels are used for the Colors.
  322.                   The LAB color model is used by Photoshop.
  323.                 </p>
  324.                   </dd>
  325.                   <dt>
  326.                     <span class="term">YCbCr</span>
  327.                   </dt>
  328.                   <dd>
  329.                     <p>
  330.                   In <acronym class="acronym">GIMP</acronym> there is four YCbCr
  331.                   decompositions with different values.
  332.                   Each option decomposes image in three greyscaled layers, a
  333.                   layer for Luminance and two other for blueness and redness.
  334.                 </p>
  335.                     <p>
  336.                   The YCbCr color model also called YUV is now used for
  337.                   digital video (initially for PAL analog video). It's based
  338.                   on the idea that the human eye is most sensitive to
  339.                   luminosity, next to colors. The YCbCr Decomposing use a
  340.                   transformation matrix and the different options are
  341.                   different values recommended by ITU (International
  342.                   Telecommunication Union) applied to the matrix .
  343.                 </p>
  344.                   </dd>
  345.                 </dl>
  346.               </div>
  347.             </dd>
  348.           </dl>
  349.         </div>
  350.         <div class="variablelist">
  351.           <dl>
  352.             <dt>
  353.               <a id="plug-in-decompose-to-layers"></a>
  354.               <span class="term">Decompose to Layers</span>
  355.             </dt>
  356.             <dd>
  357.               <p>
  358.             If this option is checked, a new grey-scaled image is created,
  359.             with each layer representing one of the channels of the selected
  360.             mode. If this option is not checked, every channel is represented
  361.             with a specific image automatically and clearly named in the name
  362.             bar.
  363.           </p>
  364.             </dd>
  365.             <dt>
  366.               <span class="term">
  367.           <span lang="en" xml:lang="en">Foreground as registration color</span>
  368.         </span>
  369.             </dt>
  370.             <dd>
  371.               <p>
  372.             This option is for specialists. It is related to CMYK printing.
  373.             When checked, every pixel of the current foreground color will
  374.             be black in each component of the decomposed images/layers. This
  375.             allows you to make crop marks visible on all channels, providing
  376.             a useful reference for alignment. A thin cross printed in
  377.             registration black can also be used to check whether the printing
  378.             plates are lined up.
  379.           </p>
  380.             </dd>
  381.           </dl>
  382.         </div>
  383.       </div>
  384.     </div>
  385.     <div class="navfooter">
  386.       <hr />
  387.       <table width="100%" summary="Navigation footer">
  388.         <tr>
  389.           <td width="40%" align="left"><a accesskey="p" href="plug-in-compose.html"><img src="../images/prev.png" alt="Prev" /></a>¬†</td>
  390.           <td width="20%" align="center">
  391.             <a accesskey="u" href="gimp-imagewindow-menus-colors.html">
  392.               <img src="../images/up.png" alt="Up" />
  393.             </a>
  394.           </td>
  395.           <td width="40%" align="right">¬†<a accesskey="n" href="plug-in-recompose.html"><img src="../images/next.png" alt="Next" /></a></td>
  396.         </tr>
  397.         <tr>
  398.           <td width="40%" align="left" valign="top"><a accesskey="p" href="plug-in-compose.html">11.15.¬†
  399.     <span lang="en" xml:lang="en">Compose</span>
  400.   </a>¬†</td>
  401.           <td width="20%" align="center">
  402.             <a accesskey="h" href="index.html">
  403.               <img src="../images/home.png" alt="Home" />
  404.             </a>
  405.           </td>
  406.           <td width="40%" align="right" valign="top">¬†<a accesskey="n" href="plug-in-recompose.html">11.17.¬†
  407.     <span lang="en" xml:lang="en">Recompose</span>
  408.   </a></td>
  409.         </tr>
  410.       </table>
  411.     </div>
  412.   </body>
  413. </html>
  414.