diff --git a/effects/shaders/chromakey.frag b/effects/shaders/chromakey.frag
index 4f57d8b1e..ea062307f 100644
--- a/effects/shaders/chromakey.frag
+++ b/effects/shaders/chromakey.frag
@@ -12,22 +12,26 @@ uniform float tola;
 uniform float tolb;
 uniform bool opt;
 uniform int mode;
- 
-float rgb2y (vec3 c) { 
-	/*a utility function to convert colors in RGB into YCbCr*/ 
-	return (0.299*c.r + 0.587*c.g + 0.114*c.b);
-} 
- 
+
+// This isn’t colour managed and is a huge mess, but in the
+// short term, using correct weights will give significantly
+// more ideal results. The correct weights for REC.709 are
+// 0.2126 R, 0.7152 G, and 0.722 B. Easy change.
+// The coefficients for YCbCr are calculated off of the
+// REC.709 values.
+	return (0.2126*c.r + 0.7152*c.g + 0.0722*c.b);
+}
+
 float rgb2cb (vec3 c) { 
 	/*a utility function to convert colors in RGB into YCbCr*/ 
-	return (0.5 + -0.168736*c.r - 0.331264*c.g + 0.5*c.b);
-} 
- 
+	return (0.5 + -0.1145721061*c.r - 0.3854278939*c.g + 0.5*c.b);
+}
+
 float rgb2cr (vec3 c) { 
 	/*a utility function to convert colors in RGB into YCbCr*/ 
-	return (0.5 + 0.5*c.r - 0.418688*c.g - 0.081312*c.b);
-} 
- 
+	return (0.5 + 0.5*c.r - 0.4541529083*c.g - 0.0458470917*c.b);
+}
+
 float colorclose(float Cb_p,float Cr_p,float Cb_key,float Cr_key,float tola,float tolb) { 
 	/*decides if a color is close to the specified hue*/ 
 	float temp = sqrt(((Cb_key-Cb_p)*(Cb_key-Cb_p))+((Cr_key-Cr_p)*(Cr_key-Cr_p)));
@@ -35,7 +39,7 @@ float colorclose(float Cb_p,float Cr_p,float Cb_key,float Cr_key,float tola,floa
 	if (temp < tolb) {return ((temp-tola)/(tolb-tola));} 
 	return (1.0); 
 }
- 
+
 void main(void) {
 	float cb_key = rgb2cb(key_color);
 	float cr_key = rgb2cr(key_color);
@@ -62,4 +66,4 @@ void main(void) {
 	}
 	
 	gl_FragColor = texture_color;
-}
\ No newline at end of file
+}