1<?xml version="1.0" encoding="UTF-8"?> 2<!DOCTYPE sect2 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" 3 "http://www.docbook.org/xml/4.3/docbookx.dtd"> 4<!-- section history: 5 2008-12-29 j.h: rev. v2.6 6 2007-10-17 ude: moved here from menus/plug-in-normalize.xml ('en','de') 7 2007-06-09 Added Spanish translation by AntI 8 2007-02-22 KoSt: added no 9 2006-09-05 example added by j.h ; text revised by scb 10 2005-11-11 split of from layer-colors.xml by axel.wernicke 11--> 12<sect2 id="plug-in-normalize"> 13 <title>Normalize</title> 14 15 <indexterm> 16 <primary>Colors</primary> 17 <secondary>Normalize</secondary> 18 </indexterm> 19 <indexterm> 20 <primary>Normalize</primary> 21 </indexterm> 22 23 <para> 24 The <guimenuitem>Normalize</guimenuitem> command scales the brightness 25 values of the active layer so that the darkest point becomes black 26 and the brightest point becomes as bright as possible, without altering 27 its hue. This is often a <quote>magic fix</quote> for images that are 28 dim or washed out. <quote>Normalize</quote> works on layers from RGB, 29 Grayscale, and Indexed images. 30 </para> 31 32 <sect3> 33 <title>Activate the Command</title> 34 <itemizedlist> 35 <listitem> 36 <para> 37 You can access this command from the image menu bar through 38 <menuchoice> 39 <guimenu>Colors</guimenu> 40 <guisubmenu>Auto</guisubmenu> 41 <guimenuitem>Normalize</guimenuitem> 42 </menuchoice>. 43 </para> 44 </listitem> 45 </itemizedlist> 46 </sect3> 47 48 <sect3> 49 <title><quote>Normalize</quote>Example</title> 50 <figure> 51 <title>Original image</title> 52 <mediaobject> 53 <imageobject> 54 <imagedata format="PNG" 55 fileref="images/menus/colors/auto/alice.png"/> 56 </imageobject> 57 <caption> 58 <para> 59 The active layer and its Red, Green and Blue 60 histograms before <quote>Normalize</quote>. 61 </para> 62 </caption> 63 </mediaobject> 64 </figure> 65 <figure> 66 <title>Image after the command</title> 67 <mediaobject> 68 <imageobject> 69 <imagedata format="PNG" 70 fileref="images/menus/colors/auto/normalize.png"/> 71 </imageobject> 72 <caption> 73 <para> 74 The active layer and its Red, Green and 75 Blue histograms after <quote>Normalize</quote>. The contrast is 76 enhanced. 77 </para> 78 <para> 79 Histogram stretching creates gaps between the pixel columns, 80 giving it a striped look. 81 </para> 82 </caption> 83 </mediaobject> 84 </figure> 85 </sect3> 86</sect2> 87