diff --git a/effects/colorsel.frag b/effects/colorsel.frag
index 801c96b73..05ddff90d 100644
--- a/effects/colorsel.frag
+++ b/effects/colorsel.frag
@@ -10,6 +10,7 @@ varying vec2 vTexCoord;
 uniform float loc;
 uniform float hic;
 uniform int compo;
+uniform bool invert;
 
 float rgb2luma(vec3 c) {
     return (max(max(c.r,c.g), c.b) + min(min(c.r,c.g), c.b))/2.0;
@@ -63,27 +64,27 @@ void main(void) {
     
 	switch(compo) {
         case 0 :
-            toCheck = rgb2luma(color);
+            toCheck = rgb2luma(color)*100.0;
             break;
         case 4 :
-            toCheck = color.r;
+            toCheck = color.r*100.0;
             break;
         case 5 :
-            toCheck = color.g;
+            toCheck = color.g*100.0;
             break;
         case 6 :
-            toCheck = color.b;
+            toCheck = color.b*100.0;
             break;
         case 1 :
-            toCheck = rgb2hsv(color).z;
+            toCheck = rgb2hsv(color).z*100.0;
             break;
         case 2 :
-            toCheck = rgb2hsv(color).x/360.0;
+            toCheck = rgb2hsv(color).x/3.6;
             break;
         case 3 :
-            toCheck = rgb2hsv(color).y;
+            toCheck = rgb2hsv(color).y*100.0;
             break;
 	}
-	tc.a = isNotIncreasingSequence(loc, toCheck, hic) ? 0.0 : tc.a;
+	tc.a = isNotIncreasingSequence(loc, toCheck, hic) ? (invert ? tc.a : 0.0) : (invert ? 0.0 : tc.a);
 	gl_FragColor = tc;
 }
diff --git a/effects/colorsel.xml b/effects/colorsel.xml
index 2a486afd2..00a4c865a 100644
--- a/effects/colorsel.xml
+++ b/effects/colorsel.xml
@@ -12,10 +12,13 @@
 		</field>
     </row>
 	<row name="Lower Limit">
-		<field type="double" min="0" default="0" max="1" id="loc"/>
+		<field type="double" min="0" default="0" max="100" id="loc"/>
 	</row>
 	<row name="Upper Limit">
-		<field type="double" min="0" default="1" max="1" id="hic"/>
+		<field type="double" min="0" default="100" max="100" id="hic"/>
+	</row>
+    <row name="Invert">
+		<field type="bool" min="0" default="100" max="100" id="invert"/>
 	</row>
 	<shader vert="common.vert" frag="colorsel.frag"/>
 </effect>
diff --git a/effects/lumakey.frag b/effects/lumakey.frag
index 3ded5dac5..d8092c4cb 100644
--- a/effects/lumakey.frag
+++ b/effects/lumakey.frag
@@ -7,6 +7,7 @@ varying vec2 vTexCoord;
 
 uniform float loc;
 uniform float hic;
+uniform bool invert;
 
 void main(void) {
 	vec4 texture_color = texture2D(tex,vTexCoord);
@@ -15,12 +16,12 @@ void main(void) {
 	
 	luma /= 2.0;
 
-	if (luma > hic) {
-        texture_color.a = 1.0;
-    } else if (luma < loc) {
-        texture_color.a = 0.0;
+	if (luma > hic/100.0) {
+        texture_color.a = (invert ? 0.0 : 1.0);
+    } else if (luma < loc/100.0) {
+        texture_color.a = (invert ? 1.0 : 0.0);
     } else {
-        texture_color.a = luma;
+        texture_color.a = (invert ? 1.0-luma : luma);
     }
 	
 	gl_FragColor = texture_color; 
diff --git a/effects/lumakey.xml b/effects/lumakey.xml
index 03b933877..0c3175c2e 100644
--- a/effects/lumakey.xml
+++ b/effects/lumakey.xml
@@ -1,10 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <effect name="Luma Key" category="Keying">
 	<row name="Lower Limit">
-		<field type="double" min="0" default="0" max="1" id="loc"/>
+		<field type="double" min="0" default="0" max="100" id="loc"/>
 	</row>
 	<row name="Upper Limit">
-		<field type="double" min="0" default="1" max="1" id="hic"/>
+		<field type="double" min="0" default="100" max="100" id="hic"/>
+	</row>
+        <row name="Invert">
+		<field type="bool" min="0" default="100" max="100" id="invert"/>
 	</row>
 	<shader vert="common.vert" frag="lumakey.frag"/>
-</effect>
\ No newline at end of file
+</effect>