[gimp-help] Fix issue #91

[Julien Hardlin <jhardlin src gnome org>]

commit cbcd8b34cbbc3dc5cc7b69a0d7f2576262d757ad
Author: Julien Hardelin <jhardlin orange fr>
Date:   Mon Nov 11 08:17:15 2019 +0100

    Fix issue #91

 images/C/glossary/alpha-channel-3a.png | Bin 5039 -> 5029 bytes
 src/concepts/layers.xml                |  32 +++++++++++++++++---------------
 2 files changed, 17 insertions(+), 15 deletions(-)
---
diff --git a/images/C/glossary/alpha-channel-3a.png b/images/C/glossary/alpha-channel-3a.png
index aa28e5f9b..52a1b4e03 100644
Binary files a/images/C/glossary/alpha-channel-3a.png and b/images/C/glossary/alpha-channel-3a.png differ
diff --git a/src/concepts/layers.xml b/src/concepts/layers.xml
index 05fb93f3c..616edae9b 100644
--- a/src/concepts/layers.xml
+++ b/src/concepts/layers.xml
@@ -115,16 +115,17 @@
             are partial transparencies.
           </para>
           <para>
-            The background layer is particular. If you have just created a
-            new image, it has still only one layer which is a background
-            layer. If the image has been created with an opaque Fill type,
-            this one layer has no Alpha channel. If you add a new layer,
-            even with an opaque Fill type, an Alpha channel is automatically
-            created, which applies to all layers apart from the background
-            layer. To get a background layer with transparency, either you
-            create your new image with a transparent Fill type, or you use
-            the
-            <link linkend="gimp-layer-alpha-add">Add an Alpha Channel</link>.
+            The <emphasis>background layer</emphasis> is particular. If you 
+            have just created a new image, it has still only one layer which 
+            is a background layer. If the image has been created with an 
+            opaque Fill type, this one layer has no Alpha channel. To get a 
+            background layer with transparency, either you create your new 
+            image with a transparent Fill type, or you use the
+            <link linkend="gimp-layer-alpha-add">Add an Alpha Channel</link>. 
+          </para>
+          <para>
+            If you add a <emphasis>new layer</emphasis>, even with an opaque Fill 
+            type, an Alpha channel is automatically added to the layer. 
           </para>
           <para>
             Every layer other than the bottom layer of an image has
@@ -202,11 +203,12 @@
                   </imageobject>
                   <caption>
                     <para>
-                      The left part of the third layer has been made transparent.
-                      The Alpha channel is still white and the left part of the
-                      layer is white, opaque! The background layer has
-                      no Alpha channel. In this case, the Clear command works
-                      like the Eraser and uses the Background color of Toolbox.
+                      The left part of the third layer has been made 
+                      transparent. The Alpha channel is still white and the 
+                      left part of the layer is opaque. The background layer 
+                      has no Alpha channel. In this case, the Clear command 
+                      works like the Eraser and uses the Background color of 
+                      Toolbox.
                     </para>
                   </caption>
                 </mediaobject>