[gimp-help] Updates in blur filters. Change link in Exposure.

[Julien Hardlin <jhardlin src gnome org>]

commit c608f56f8e9d181f061251eacbe3f8ffaa634167
Author: Julien Hardelin <jhardlin orange fr>
Date:   Mon Nov 19 08:08:31 2018 +0100

    Updates in blur filters. Change link in Exposure.

 images/C/filters/examples/blur/pixelize-use.png | Bin 0 -> 4615 bytes
 src/filters/blur/circular-motion.xml            |   9 +++++++++
 src/filters/blur/gauss.xml                      |  20 +++++++++++++++++++-
 src/filters/blur/pixelize.xml                   |  24 ++++++++++++++++++++++--
 src/filters/blur/zoom-motion.xml                |   9 +++++++++
 src/menus/colors/exposure.xml                   |   2 +-
 6 files changed, 60 insertions(+), 4 deletions(-)
---
diff --git a/images/C/filters/examples/blur/pixelize-use.png b/images/C/filters/examples/blur/pixelize-use.png
new file mode 100644
index 000000000..837721890
Binary files /dev/null and b/images/C/filters/examples/blur/pixelize-use.png differ
diff --git a/src/filters/blur/circular-motion.xml b/src/filters/blur/circular-motion.xml
index 7a22feee8..74732319e 100644
--- a/src/filters/blur/circular-motion.xml
+++ b/src/filters/blur/circular-motion.xml
@@ -92,6 +92,15 @@
           </para>
         </listitem>
       </varlistentry>
+      
+      <varlistentry>
+        <term><guilabel>Use selection/entire layer as input</guilabel></term>
+        <listitem>
+          <para>
+            Explained in <xref linkend="gimp-filter-pixelize"/>.
+          </para>
+        </listitem>
+      </varlistentry>
     </variablelist>
   </sect3>
 </sect2>
\ No newline at end of file
diff --git a/src/filters/blur/gauss.xml b/src/filters/blur/gauss.xml
index 0a7d9b9ed..075fc6e94 100644
--- a/src/filters/blur/gauss.xml
+++ b/src/filters/blur/gauss.xml
@@ -2,6 +2,7 @@
 <!DOCTYPE sect2 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
                        "http://www.docbook.org/xml/4.3/docbookx.dtd";>
 <!-- section history:
+  2018-11-17 j.h Fix TODO
   2017-10-12 j.h : some updates
 -->
 <sect2 id="gimp-filter-gaussian-blur">
@@ -175,7 +176,24 @@
       </varlistentry>
     </variablelist>
     <para>
-      The Gaussian Blur filter doesn't preserve edges in the image. See... TODO
+      The Gaussian Blur filter doesn't preserve edges in the image:
+      <mediaobject>
+        <imageobject>
+          <imagedata format="PNG"
+          fileref="images/filters/examples/blur/median-vs-gaussian.png"/>
+        </imageobject>
+        <caption>
+          <para>
+            Left: Origin
+          </para>
+          <para>
+            Middle: Median
+          </para>
+          <para>
+            Right: Gaussian
+          </para>
+        </caption>
+      </mediaobject>
     </para>
   </sect3>
 </sect2>
diff --git a/src/filters/blur/pixelize.xml b/src/filters/blur/pixelize.xml
index 5f3e1b9b8..f904352b4 100644
--- a/src/filters/blur/pixelize.xml
+++ b/src/filters/blur/pixelize.xml
@@ -130,8 +130,28 @@
         <term><guilabel>Use the selection as input</guilabel></term>
         <listitem>
           <para>
-            TODO. Not working. Filter works on selection if a selection exists, 
-            on the entire layer if there is no selection.
+            If this option is selected, the filter uses pixels in selection 
+            only.
+          </para>
+        </listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><guilabel>Use the entire layer as input</guilabel></term>
+        <listitem>
+          <para>
+            If this option is selected, the filter uses pixels adjacent to the 
+            selection to create a more progressive border.
+          </para>
+          <para>
+            <mediaobject>
+              <imageobject>
+                <imagedata format="PNG"
+                  fileref="images/filters/examples/blur/pixelize-use.png"/>
+              </imageobject>
+              <caption>
+                <para>Left: selection only     Right: entire layer</para>
+              </caption>
+            </mediaobject>
           </para>
         </listitem>
       </varlistentry>
diff --git a/src/filters/blur/zoom-motion.xml b/src/filters/blur/zoom-motion.xml
index 80d351c4c..94dc3f795 100644
--- a/src/filters/blur/zoom-motion.xml
+++ b/src/filters/blur/zoom-motion.xml
@@ -94,6 +94,15 @@
           </para>
         </listitem>
       </varlistentry>
+      
+      <varlistentry>
+        <term><guilabel>Use selection/entire layer as input</guilabel></term>
+        <listitem>
+          <para>
+            Explained in <xref linkend="gimp-filter-pixelize"/>.
+          </para>
+        </listitem>
+      </varlistentry>
     </variablelist>
   </sect3>
 </sect2>
\ No newline at end of file
diff --git a/src/menus/colors/exposure.xml b/src/menus/colors/exposure.xml
index 2add55118..5e2da3e1a 100644
--- a/src/menus/colors/exposure.xml
+++ b/src/menus/colors/exposure.xml
@@ -19,7 +19,7 @@
   <para>
     This filter is used for lightning shadows and midtones of an image without 
     blowing the highlights. A detailed tutorial can be found at 
-    <ulink url="https://www.gimp.org/tutorials/Tone_Mapping_Using_GIMP_Levels"/>
+    <xref linkend="tone-mapping-tutorial"/>.
   </para>
   
   <sect3>