Unity将RenderTexture转成一张图片并剪裁保存到本地

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    //将RenderTexture保存成一张png图片  
    public bool SaveRenderTextureToPNG(RenderTexture rt, string contents, string pngName)
    {
        RenderTexture prev = RenderTexture.active;
        RenderTexture.active = rt;
        Texture2D png = new Texture2D(rt.width, rt.height, TextureFormat.ARGB32, false);
        png.ReadPixels(new Rect(0, 0, rt.width, rt.height), 0, 0);
        byte[] bytes = png.EncodeToPNG();
        if (!Directory.Exists(contents))
            Directory.CreateDirectory(contents);
        FileStream file = File.Open(contents + "/" + pngName + ".png", FileMode.Create);
        BinaryWriter writer = new BinaryWriter(file);
        writer.Write(bytes);
        file.Close();
        Texture2D.DestroyImmediate(png);
        png = null;
        RenderTexture.active = prev;
        return true;

    }  

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截取前图片为如下：

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剪切后画面如下：

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关于剪裁我想说明如下：
照片需要放在画布上
从照片的哪个位置开始剪裁，剪多宽和多高
剪裁完毕的图片相对于画布，摆在画布的哪个位置

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