Generic Unity camera image effect script

using UnityEngine;
using System.Collections;

[ExecuteInEditMode]
public class CamPost : MonoBehaviour
{
    [SerializeField] private Shader shader;
    private Material material;

    void OnEnable()
    {
        material = new Material(shader);
    }

    void OnRenderImage(RenderTexture source, RenderTexture destination)
    {
        Graphics.Blit(source, destination, material);
    }
}