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Assets/Materials/PostProcessing/GrayscaleShader.shader

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+Shader "Custom/GreyscaleShader"
+{
+	HLSLINCLUDE
+#include "Packages/com.unity.postprocessing/PostProcessing/Shaders/StdLib.hlsl"
+
+		TEXTURE2D_SAMPLER2D(_MainTex, sampler_MainTex);
+	float _Blend;
+
+	float4 Frag(VaryingsDefault i) :SV_Target
+	{
+		float4 color = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.texcoord);
+		float luminance = dot(color.rgb, float3(0.2126729, 0.7151522, 0.0721750));
+		color.rgb = lerp(color.rgb, luminance.xxx, _Blend.xxx);
+		return color;
+	}
+	ENDHLSL
+    SubShader
+    {
+		Cull Off
+		ZWrite Off
+		ZTest Always
+
+		Pass{
+			HLSLPROGRAM
+
+				#pragma vertex VertDefault
+				#pragma fragment Frag
+
+			ENDHLSL
+		}
+    }
+}