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