ACME-1245 : Tweak a bit the Video.xml filter

indra/newview/app_settings/filters/Video.xml

@@ -2,7 +2,14 @@
     <array>
         <array>
             <string>linearize</string>
-            <real>0.01</real>
+            <real>0.0</real>
+            <real>1.0</real>
+            <real>1.0</real>
+            <real>1.0</real>
+        </array>
+        <array>
+            <string>darken</string>
+            <real>15.0</real>
             <real>1.0</real>
             <real>1.0</real>
             <real>1.0</real>
@@ -14,7 +21,7 @@
         </array>
         <array>
             <string>brighten</string>
-            <real>100.0</real>
+            <real>30.0</real>
             <real>1.0</real>
             <real>1.0</real>
             <real>1.0</real>