ImageEffectBase2.cs

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using UnityEngine;

[RequireComponent (typeof(Camera))]
[AddComponentMenu("")]
public class ImageEffectBase2 : MonoBehaviour {
    public Shader   shader;
    private Material m_Material;

    protected void Start ()
    {
        // Disable if we don't support image effects
        if (!SystemInfo.supportsImageEffects) {
            enabled = false;
            return;
        }
        
        // Disable the image effect if the shader can't
        // run on the users graphics card
        if (!shader || !shader.isSupported)
            enabled = false;
    }

    protected Material material {
        get {
            if (m_Material == null) {
                m_Material = new Material (shader);
                m_Material.hideFlags = HideFlags.HideAndDontSave;
            }
            return m_Material;
        } 
    }
    
    protected void OnDisable() {
        if( m_Material ) {
            DestroyImmediate( m_Material );
        }
    }
}