[gimp-help] Update Stretch Contrast

[Julien Hardlin <jhardlin src gnome org>]

commit b8a816bfb8577204878e70cd439dbf1f5eb9f759
Author: Julien Hardelin <jhardlin orange fr>
Date:   Sat Dec 7 07:14:10 2019 +0100

    Update Stretch Contrast

 .../menus/colors/auto/stretch_contrast-dialog.png  | Bin 0 -> 19278 bytes
 src/menus/colors/auto/stretch-contrast.xml         |  48 +++++++++++++++++++--
 2 files changed, 45 insertions(+), 3 deletions(-)
---
diff --git a/images/C/menus/colors/auto/stretch_contrast-dialog.png 
b/images/C/menus/colors/auto/stretch_contrast-dialog.png
new file mode 100644
index 000000000..b922ed0ce
Binary files /dev/null and b/images/C/menus/colors/auto/stretch_contrast-dialog.png differ
diff --git a/src/menus/colors/auto/stretch-contrast.xml b/src/menus/colors/auto/stretch-contrast.xml
index a15d8a247..d1b4b6f2d 100644
--- a/src/menus/colors/auto/stretch-contrast.xml
+++ b/src/menus/colors/auto/stretch-contrast.xml
@@ -2,10 +2,8 @@
 <!DOCTYPE sect2 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
                        "http://www.docbook.org/xml/4.3/docbookx.dtd";>
 <!-- section history:
-  2008-12-29 j.h: rev. 2.6. No change
+  2019-12-06 j.h: adapted to GEGL
   2007-10-17 ude: moved here from menus/plug-in-c-astretch.xml ('en','de')
-  2007-06-09 Added Spanish translation by AntI
-  2007-02-22 KoSt: added no
   2006-09-05 Example added by j.h; text revised by scb
   2005-11-11 split of from layer-colors.xml by axel.wernicke
 -->
@@ -57,6 +55,50 @@
       </listitem>
     </itemizedlist>
   </sect3>
+  
+  <sect3>
+    <title>Options</title>
+    <figure>
+      <title><quote>Stretch Contrast</quote> settings</title>
+      <mediaobject>
+        <imageobject>
+          <imagedata format="PNG"
+            fileref="images/menus/colors/auto/stretch_contrast-dialog.png"/>
+        </imageobject>
+      </mediaobject>
+    </figure>
+    <variablelist>
+      <varlistentry>
+        <term><guilabel>Presets</guilabel>, <guilabel>Preview</guilabel>, 
+          <guilabel>Split view</guilabel></term>
+        <listitem>
+          <para>
+            These options are common to GEGL-based filters. Please refer to 
+            <xref linkend="gimp-filters-common"/>.
+          </para>
+        </listitem>
+      </varlistentry>
+      
+      <varlistentry>
+        <term>Keep Colors</term>
+        <listitem>
+          <para>
+            Impact each color channel with the same amount.
+          </para>
+        </listitem>
+      </varlistentry>
+      
+      <varlistentry>
+        <term>Non-Linear Components</term>
+        <listitem>
+          <para>
+            When set, this option operates on gamma corrected values instead 
+            of linear RGB, acting like the old Normalize filter.
+          </para>
+        </listitem>
+      </varlistentry>
+    </variablelist>
+  </sect3>
 
   <sect3>
     <title><quote>Stretch Contrast</quote> Example</title>