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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>6.2.┬áMode</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="ch05s06.html" title="6.┬áImage" />
  12.     <link rel="prev" href="ch05s06.html" title="6.┬áImage" />
  13.     <link rel="next" href="ch05s06s03.html" title="6.3.┬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">6.┬áImage</th>
  20.         </tr>
  21.         <tr>
  22.           <td width="20%" align="left"><a accesskey="p" href="ch05s06.html">Prev</a>┬á</td>
  23.           <th width="60%" align="center" id="sectionname">6.2.┬áMode</th>
  24.           <td width="20%" align="right">┬á<a accesskey="n" href="ch05s06s03.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-image-mode"></a>6.2.┬áMode</h3>
  34.           </div>
  35.         </div>
  36.       </div>
  37.       <a id="id3466935" class="indexterm"></a>
  38.       <div class="informalfigure">
  39.         <div class="mediaobject">
  40.           <img src="../images/menus/menus-image-mode.png" />
  41.           <div class="caption">
  42.             <p>
  43.           The Mode submenu of the Image menu
  44.         </p>
  45.           </div>
  46.         </div>
  47.       </div>
  48.       <div class="simplesect" lang="en" xml:lang="en">
  49.         <div class="titlepage">
  50.           <div>
  51.             <div>
  52.               <h4 class="title"><a id="id3466968"></a>Overview</h4>
  53.             </div>
  54.           </div>
  55.         </div>
  56.         <p>
  57.       This command can be accessed via the image menu:
  58.       <span class="guimenu">Image</span>/
  59.       <span class="guimenuitem"><span class="accel">M</span>ode...</span>.
  60.     </p>
  61.         <p>
  62.       It allows you to change the color
  63.       mode of your image.  Three modes are available:
  64.     </p>
  65.       </div>
  66.       <div class="simplesect" lang="en" xml:lang="en">
  67.         <div class="titlepage">
  68.           <div>
  69.             <div>
  70.               <h4 class="title"><a id="id3467006"></a>Mode Menuitems</h4>
  71.             </div>
  72.           </div>
  73.         </div>
  74.         <div class="variablelist">
  75.           <dl>
  76.             <dt>
  77.               <a id="gimp-image-convert-rgb"></a>
  78.               <span class="term">The RGB mode</span>
  79.             </dt>
  80.             <dd>
  81.               <p>          
  82.               You are normally working in RGB mode, well adapted to
  83.               screen.  See <a href="go01.html#glossary-colormodel">Glossary</a>.  You can
  84.               change RGB to Grayscale or Indexed, but be careful: once the
  85.               image saved you can no longer retrieve the RGB colors.  Work
  86.               on a copy.      
  87.             </p>
  88.             </dd>
  89.             <dt>
  90.               <a id="gimp-image-convert-grayscale"></a>
  91.               <span class="term">The Grayscale mode</span>
  92.             </dt>
  93.             <dd>
  94.               <p>                   
  95.               <span class="guilabel">Grayscale</span>: Converts your image to a 256
  96.               gray level image. See the glossary for mor information about
  97.               the <a href="go01.html#glossary-colormodel">grayscale
  98.               mode</a>. 
  99.             </p>
  100.             </dd>
  101.             <dt>
  102.               <a id="gimp-image-convert-indexed"></a>
  103.               <span class="term">The Indexed mode</span>
  104.             </dt>
  105.             <dd>
  106.               <p>                   
  107.               This option opens the <span class="guilabel">Convert Image to Indexed
  108.               Colors</span> dialog:  
  109.             </p>
  110.               <div class="mediaobject">
  111.                 <img src="../images/dialogs/dialogs-image-mode-indexed.png" />
  112.               </div>
  113.             </dd>
  114.           </dl>
  115.         </div>
  116.         <div class="variablelist">
  117.           <p class="title">
  118.             <b>Convert Image to Indexed Colors</b>
  119.           </p>
  120.           <p>
  121.             See <a href="go01.html#glossary-colormodel">Glossary</a> for 
  122.             explanations about the Indexed Color Mode.
  123.           </p>
  124.           <dl>
  125.             <dt>
  126.               <span class="term">General Palette Options</span>
  127.             </dt>
  128.             <dd>
  129.               <div class="itemizedlist">
  130.                 <ul type="opencircle">
  131.                   <li style="list-style-type: circle">
  132.                     <p>
  133.                   <span class="guilabel">Generate Optimate Palette</span>: This
  134.                   option generates the best possible palette with a
  135.                   default maximum number of 256 colors (classical GIF
  136.                   format). You can reduce this <span class="emphasis"><em>Maximum Number of
  137.                   Colors</em></span>. This may create unwanted effects on
  138.                   smooth transitions. You can reduce them by using a
  139.                   dithering option.
  140.                 </p>
  141.                   </li>
  142.                   <li style="list-style-type: circle">
  143.                     <p>
  144.                   <span class="guilabel">Use Black and White (1-bit)
  145.                   Palette</span>: This option generates line-art
  146.                   images.
  147.                 </p>
  148.                   </li>
  149.                   <li style="list-style-type: circle">
  150.                     <p>
  151.                   <span class="guilabel">Use Custom Palette</span>: The button
  152.                   allows you to select a custom palette in a list. The
  153.                   number of colors is indicated for each palette. The Web
  154.                   palette, 216 colors, is the Web-safe palette. It was
  155.                   originally created by Netscape to provide colors that
  156.                   would look the same on both Macs and PCs and Internet
  157.                   Explorer 3 could manage it. Since version 4, MSIE
  158.                   handles a 212 colors palette... This problem of color
  159.                   similarity between all platforms is not solved yet and
  160.                   probably will never be. You have to keep to two
  161.                   principles in your Web page: light text on dark
  162.                   background or dark text on light background and never
  163.                   entrust an information to a color.              
  164.                 </p>
  165.                     <p>
  166.                   Some colors of the palette may not be used if your image
  167.                   is poorly colored. They will be removed from the palette
  168.                   if the option <span class="emphasis"><em>Remove Unused Colors from the
  169.                   Final Palette</em></span> is checked.
  170.                 </p>
  171.                   </li>
  172.                 </ul>
  173.               </div>
  174.             </dd>
  175.             <dt>
  176.               <span class="term">Dithering Options</span>
  177.             </dt>
  178.             <dd>
  179.               <p>
  180.               As an indexed image contains 256 colors or less, some colors
  181.               in the original image may be absent in the palette. This may
  182.               result in some blotchy or solid colors in subtle color
  183.               areas. These options allows you to correct these unwanted
  184.               effects induced by the Palette Options. 
  185.             </p>
  186.               <p>
  187.               The filter will attempt to approximate the missing color by
  188.               spreading pixels of the nearest palette colors going
  189.               clustering.  These clustered pixels seen from a distance
  190.               simulate a new color. See the glossary for more information
  191.               on <a href="go01.html#glossary-dithering">dithering</a>.
  192.             </p>
  193.               <p>
  194.               Three filters are available. It's not possible to foresee
  195.               what the result of a specific filter will be and you will
  196.               have to try all to get the best result. The
  197.               <span class="emphasis"><em>Positioned Color Dithering</em></span> is well
  198.               adapted to animations. 
  199.             </p>
  200.               <div class="informalfigure">
  201.                 <div class="mediaobject">
  202.                   <img src="../images/dialogs/examples/dither1.png" />
  203.                   <div class="caption">
  204.                     <p>
  205.                     Here is the image of a smooth transition as an
  206.                     example.
  207.                   </p>
  208.                   </div>
  209.                 </div>
  210.               </div>
  211.               <div class="informalfigure">
  212.                 <div class="mediaobject">
  213.                   <img src="../images/dialogs/examples/dither2.png" />
  214.                   <div class="caption">
  215.                     <p>
  216.                     After transformation to GIF 4 colors without dithering.
  217.                   </p>
  218.                   </div>
  219.                 </div>
  220.               </div>
  221.               <div class="informalfigure">
  222.                 <div class="mediaobject">
  223.                   <img src="../images/dialogs/examples/dither3.png" />
  224.                   <div class="caption">
  225.                     <p>
  226.                     GIF 4 colors with Floyd-Sternberg (normal).
  227.                   </p>
  228.                   </div>
  229.                 </div>
  230.               </div>
  231.               <div class="informalfigure">
  232.                 <div class="mediaobject">
  233.                   <img src="../images/dialogs/examples/dither4.png" />
  234.                   <div class="caption">
  235.                     <p>
  236.                     GIF 4 colors with Floyd-Sternberg-2.
  237.                   </p>
  238.                   </div>
  239.                 </div>
  240.               </div>
  241.               <p>
  242.               In a GIF image transparency is coded on 1 bit: transparent
  243.               or not transparent. To give an illusion of partial
  244.               transparency use the option <span class="guilabel">Enable Dithering of
  245.               Transparency</span>, but the semi-flatten plugin
  246.                will give you a better result.
  247.             </p>
  248.             </dd>
  249.           </dl>
  250.         </div>
  251.       </div>
  252.     </div>
  253.     <div class="navfooter">
  254.       <hr />
  255.       <table width="100%" summary="Navigation footer">
  256.         <tr>
  257.           <td width="40%" align="left"><a accesskey="p" href="ch05s06.html">Prev</a>┬á</td>
  258.           <td width="20%" align="center">
  259.             <a accesskey="u" href="ch05s06.html">Up</a>
  260.           </td>
  261.           <td width="40%" align="right">┬á<a accesskey="n" href="ch05s06s03.html">Next</a></td>
  262.         </tr>
  263.         <tr>
  264.           <td width="40%" align="left" valign="top">6.┬áImage┬á</td>
  265.           <td width="20%" align="center">
  266.             <a accesskey="h" href="index.html">Home</a>
  267.           </td>
  268.           <td width="40%" align="right" valign="top">┬á6.3.┬áTransform</td>
  269.         </tr>
  270.       </table>
  271.     </div>
  272.   </body>
  273. </html>
  274.