[gimp-help-2] Fix description of the Threshold Alpha command

[Ulf-D. Ehlert <ulfehlert src gnome org>]

commit 45d6e10718e394fb47b3e8c7f8d124051d900691
Author: Ulf-D. Ehlert <ulfehlert svn gnome org>
Date:   Sat Sep 5 14:02:56 2009 +0200

    Fix description of the Threshold Alpha command
    
    * Exchange "above threshold" and "below threshold"
      in the description of the Threshold option.
    * Add new example images.

 images/C/menus/layer/threshold-alpha-example.png  |  Bin 0 -> 2830 bytes
 images/C/menus/layer/threshold-alpha-example3.png |  Bin 0 -> 1600 bytes
 images/C/menus/threshold-alpha-ex1.png            |  Bin 8510 -> 0 bytes
 images/C/menus/threshold-alpha-ex2.png            |  Bin 6047 -> 0 bytes
 src/menus/layer/threshold-alpha.xml               |   19 +++++++++++++------
 5 files changed, 13 insertions(+), 6 deletions(-)
---
diff --git a/images/C/menus/layer/threshold-alpha-example.png b/images/C/menus/layer/threshold-alpha-example.png
new file mode 100644
index 0000000..0b54430
Binary files /dev/null and b/images/C/menus/layer/threshold-alpha-example.png differ
diff --git a/images/C/menus/layer/threshold-alpha-example3.png b/images/C/menus/layer/threshold-alpha-example3.png
new file mode 100644
index 0000000..5e02735
Binary files /dev/null and b/images/C/menus/layer/threshold-alpha-example3.png differ
diff --git a/src/menus/layer/threshold-alpha.xml b/src/menus/layer/threshold-alpha.xml
index b23b288..f61da2c 100644
--- a/src/menus/layer/threshold-alpha.xml
+++ b/src/menus/layer/threshold-alpha.xml
@@ -67,16 +67,23 @@
           <para>
             You can set the transparency value to be used as a threshold by
             using the slider or by entering a value between 0 and 255 in
-            the input box. All transparency values below this threshold will
-            become opaque and all transparency values above it will become
-            completely transparent. The transition is abrupt.
+            the input box. All transparency values above this threshold will
+            become opaque and all transparency values below or equal to this
+            threshold will become completely transparent. The transition is
+            abrupt.
           </para>
+          <note>
+            <para>
+              This command will never make completely transparent pixels
+              (alpha value = 0) opaque.
+            </para>
+          </note>
           <figure>
             <title>Threshold Alpha example</title>
             <mediaobject>
               <imageobject>
                 <imagedata format="PNG"
-                  fileref="images/menus/threshold-alpha-ex1.png" />
+                  fileref="images/menus/layer/threshold-alpha-example.png"/>
               </imageobject>
               <caption>
                 A transparency gradient 0-255.
@@ -85,10 +92,10 @@
             <mediaobject>
               <imageobject>
                 <imagedata format="PNG"
-                  fileref="images/menus/threshold-alpha-ex2.png" />
+                  fileref="images/menus/layer/threshold-alpha-example3.png"/>
               </imageobject>
               <caption>
-                Threshold Alpha set to 92.
+                Threshold set to 50, 127, 210.
               </caption>
             </mediaobject>
           </figure>