init

Assets/Materials/PostProcessing/Greyscale.cs

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+using System;
+using UnityEngine;
+using UnityEngine.Rendering.PostProcessing;
+
+[Serializable]
+[PostProcess(typeof(GrayscaleRenderer), PostProcessEvent.AfterStack, "Custom/Grayscale")]
+public sealed class Grayscale : PostProcessEffectSettings
+{
+    [Range(0, 1), Tooltip("Grayscale effect intensity")]
+    public FloatParameter blend = new FloatParameter { value = .5f };
+}
+
+public sealed class GrayscaleRenderer : PostProcessEffectRenderer<Grayscale>
+{
+    public override void Render(PostProcessRenderContext context)
+    {
+        var sheet = context.propertySheets.Get(Shader.Find("Hidden/Custom/Grayscale"));
+        sheet.properties.SetFloat("_Blend", settings.blend);
+        context.command.BlitFullscreenTriangle(context.source, context.destination, sheet, 0);
+    }
+}