[Unity] ShakeColor

ShakeColor.cs

using System;
using UnityEngine;
using UnityStandardAssets.ImageEffects;

namespace TSKT
{
    [RequireComponent(typeof(Camera))]
    public class ShakeColor : ImageEffectBase
    {
        [Range(0.01f, 1f)]
        public float intensity = 0.01f;

        int _RedOffsetPropertyId;
        int _BlueOffsetPropertyId;
        int _GreenOffsetPropertyId;

        void Awake()
        {
            _RedOffsetPropertyId = Shader.PropertyToID("_RedOffset");
            _BlueOffsetPropertyId = Shader.PropertyToID("_BlueOffset");
            _GreenOffsetPropertyId = Shader.PropertyToID("_GreenOffset");
        }

        void OnRenderImage(RenderTexture source, RenderTexture destination)
        {
            material.SetVector(_RedOffsetPropertyId, GenerateOffset(intensity));
            material.SetVector(_BlueOffsetPropertyId, GenerateOffset(intensity));
            material.SetVector(_GreenOffsetPropertyId, GenerateOffset(intensity));
            Graphics.Blit(source, destination, material);
        }

        static Vector2 GenerateOffset(float intensity)
        {
            return new Vector2(
                UnityEngine.Random.Range(-intensity, intensity),
                UnityEngine.Random.Range(-intensity, intensity));
        }
    }
}

ShakeColorEffect.shader

Shader "TSKT/Hidden/ShakeColor Effect"
{
    Properties {
        _MainTex ("Base (RGB)", 2D) = "white" {}
        _RedOffset("RedOffset", Vector) = (0.0, 0.0, 0.0, 0.0)
        _BlueOffset("BlueOffset", Vector) = (0.0, 0.0, 0.0, 0.0)
        _GreenOffset("GreenOffset", Vector) = (0.0, 0.0, 0.0, 0.0)
    }

    SubShader {
        Pass {
            ZTest Always Cull Off ZWrite Off
                
            CGPROGRAM
            #pragma vertex vert_img
            #pragma fragment frag
            #include "UnityCG.cginc"

            uniform sampler2D _MainTex;
            half4 _RedOffset;
            half4 _BlueOffset;
            half4 _GreenOffset;

            fixed4 frag (v2f_img i) : SV_Target
            {
                fixed a = tex2D(_MainTex, i.uv).a;
                fixed r = tex2D(_MainTex, i.uv + _RedOffset.xy).r;
                fixed g = tex2D(_MainTex, i.uv + _GreenOffset.xy).g;
                fixed b = tex2D(_MainTex, i.uv + _BlueOffset.xy).b;

                return fixed4(r, g, b, a);
            }
            ENDCG

        }
    }

    Fallback off
}