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Assets/AmplifyShaderEditor/Plugins/EditorResources/Previews/Preview_DesaturateNode.shader

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+Shader "Hidden/DesaturateNode"
+{
+	Properties
+	{
+		_A ( "_RBG",  2D ) = "white" {}
+		_B ( "_Fraction",  2D ) = "white" {}
+	}
+
+	SubShader
+	{
+		Pass
+		{
+			CGPROGRAM
+			#include "UnityCG.cginc"
+			#include "Preview.cginc"
+			#pragma vertex vert_img
+			#pragma fragment frag
+
+			uniform sampler2D _A;
+			uniform sampler2D _B;
+			
+			float4 frag ( v2f_img i ) : SV_Target
+			{
+				float3 rgb = tex2D ( _A, i.uv ).rgb;
+				float fraction = tex2D ( _B, i.uv ).r;
+
+				float dotResult = dot ( rgb, float3( 0.299, 0.587, 0.114 ) );
+				float3 finalColor = lerp ( rgb, dotResult.xxx, fraction );
+				
+				return float4( finalColor, 1 );
+			}
+			ENDCG
+		}
+	}
+}