Fix 3 failing Magick.NET unit tests
diff --git a/ChangeLog b/ChangeLog
index e39104b..cd7723a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2020-01-12  7.0.9-16 Cristy  <quetzlzacatenango@image...>
+  * Release ImageMagick version 7.0.9-16, GIT revision 16...
+
+2020-01-12  7.0.9-16 Cristy  <quetzlzacatenango@image...>
+  * Fixed three failing Magick.NET unit tests.
+
 2020-01-11  7.0.9-15 Cristy  <quetzlzacatenango@image...>
   * Release ImageMagick version 7.0.9-15, GIT revision 16709:0000f6d:20200111.
 
diff --git a/MagickCore/fx.c b/MagickCore/fx.c
index d2b24e3..ed28751 100644
--- a/MagickCore/fx.c
+++ b/MagickCore/fx.c
@@ -1149,6 +1149,8 @@
   value=GetFxSymbolValue(fx_info,symbol);
   if (value != (const double *) NULL)
     return(*value);
+  (void) ThrowMagickException(exception,GetMagickModule(),OptionError,
+    "UndefinedVariable","`%s'",symbol);
   (void) SetFxSymbolValue(fx_info,symbol,0.0);
   return(0.0);
 }
diff --git a/MagickCore/quantize.c b/MagickCore/quantize.c
index 3d5745f..0502c1d 100644
--- a/MagickCore/quantize.c
+++ b/MagickCore/quantize.c
@@ -653,7 +653,7 @@
       /*
         Monochrome image.
       */
-      intensity=GetPixelInfoLuma(image->colormap+0) > QuantumRange/2.0 ? 0.0 :
+      intensity=GetPixelInfoLuma(image->colormap+0) < QuantumRange/2.0 ? 0.0 :
         QuantumRange;
       if (image->colors > 1)
         {
diff --git a/config/english.xml b/config/english.xml
index 7aa2ccf..d38285b 100644
--- a/config/english.xml
+++ b/config/english.xml
@@ -776,6 +776,9 @@
         <message name="UnbalancedParenthesis">
           unbalanced parenthesis
         </message>
+        <message name="UndefinedVariable">
+          undefined variable
+        </message>
         <message name="UnrecognizedAttribute">
           unrecognized attribute
         </message>
diff --git a/config/francais.xml b/config/francais.xml
index 8a769fe..66c82ef 100644
--- a/config/francais.xml
+++ b/config/francais.xml
@@ -767,6 +767,9 @@
         <message name="UnbalancedParenthesis">
           parenthèse non fermée
         </message>
+        <message name="UndefinedVariable">
+          undefined variable
+        </message>
         <message name="UnrecognizedAttribute">
           attribut non reconnu
         </message>