将TIF 文件转换为图片

protected void Button1_Click(object sender, EventArgs e)
    {
        System.Drawing.Image img = System.Drawing.Image.FromFile(Server.MapPath("~/images/1.tif"));
        Guid guid = (Guid)img.FrameDimensionsList.GetValue(0);
        System.Drawing.Imaging.FrameDimension dimension = new System.Drawing.Imaging.FrameDimension(guid);
        int totalPage = img.GetFrameCount(dimension);
        for (int i = 0; i < totalPage; i++)
        {
            img.SelectActiveFrame(dimension, i);
            img.Save("C:\\Gif" + i + ".gif", ImageFormat.Gif);
        } 

    }