Init

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

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+Shader "Hidden/PosterizeNode"
+{
+	Properties
+	{
+		_A ( "_RGBA",  2D ) = "white" {}
+		_B ( "_Power",  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
+			{
+				float4 rgba = tex2D ( _B, i.uv );
+				float power = tex2D ( _A, i.uv ).r;
+				if ( power < 1 )
+					return float4(0,0,0,0);
+				float divideOp = 256.0 / float ( (int)power );
+				float4 finalColor = ( floor ( rgba * divideOp ) / divideOp );
+
+				return finalColor;
+			}
+			ENDCG
+		}
+	}
+}