[unity]Rendertexture screenshot to NGUI UITexture

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using UnityEngine;
using System.Collections;
 
public class TakeScreenShot : MonoBehaviour
{
    public Camera RenderCam;
 
    public UITexture tex;
 
    private Texture2D image;
 
    private int width = 863,
                height = 402;
   
 
    public void CaptureImage()
    {
        RenderTexture rt = new RenderTexture(width, height, 24);
        image = new Texture2D(width, height, TextureFormat.ARGB32, false);
 
        //Camera settings
        RenderCam.aspect = 1.0f;
        RenderCam.targetTexture = rt;
        RenderCam.Render();
 
        RenderTexture.active = rt;
        image.ReadPixels(new Rect(0.0f, 0.0f, width, height), 0, 0);
        image.Apply();
        tex.mainTexture = image;
        RenderTexture.active = null;
        RenderCam.targetTexture = null;
 
    }
}