diff --git a/shaders/highPass.frag b/shaders/highPass.frag
index 4f36ebd..11f4d1b 100644
--- a/shaders/highPass.frag
+++ b/shaders/highPass.frag
@@ -3,9 +3,9 @@ varying vec2 vUV;
 uniform sampler2D tex;
 uniform float highPassThreshold;
 void main() {
-	vec3 lumaColor = texture2D(tex, vUV).rgb;
-	if (lumaColor.r < highPassThreshold) lumaColor.r = 0.0;
-	if (lumaColor.g < highPassThreshold) lumaColor.g = 0.0;
-	if (lumaColor.b < highPassThreshold) lumaColor.b = 0.0;
-	gl_FragColor = vec4(lumaColor, 1.0);
+	vec4 color = texture2D(tex, vUV);
+	if (color.r < highPassThreshold) color.r = 0.0;
+	if (color.g < highPassThreshold) color.g = 0.0;
+	if (color.b < highPassThreshold) color.b = 0.0;
+	gl_FragColor = color;
 }