.net Graphics 生成的图片文件非常大，如何解决这一问题？

Question

        public int Width {
            set {
                if(value < 300) {
                    m_Width = 300;
                } else {
                    m_Width = value;
                }
            }
            get {
                return m_Width;
            }
        }        public int Height {
            set {
                if(value < 300) {
                    m_Height = 300;
                } else {
                    m_Height = value;
                }
            }
            get {
                return m_Height;
            }
        } private int m_Width = 640; //图像宽度
        private int m_Height = 480; //图像高度
        //初始化和填充图像区域，画出边框，初始标题
        private void InitializeGraph() {            //根据给定的高度和宽度创建一个位图图像
            objBitmap = new Bitmap(Width, Height);
}

Answer 1

         graphic.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
 
            //设置高质量，低速度呈现平滑程度
            graphic.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;你这两个设置这么高,肯定会很慢的呀

Answer 2

        /// <summary>
        /// 制作小正方形
        /// </summary>
        /// <param name="fileName">原图的文件路径</param>
        /// <param name="newFileName">新地址</param>
        /// <param name="newSize">长度或宽度</param>
        public static void MakeSquareImage(string fileName, string newFileName, int newSize)
        {
            Image image = Image.FromFile(fileName);            int i = 0;
            int width = image.Width;
            int height = image.Height;
            if (width > height)
                i = height;
            else
                i = width;            Bitmap b = new Bitmap(newSize, newSize);            try
            {
                Graphics g = Graphics.FromImage(b);
                g.InterpolationMode = InterpolationMode.High;
                g.SmoothingMode = SmoothingMode.HighQuality;
                g.CompositingQuality = CompositingQuality.HighQuality;
                //清除整个绘图面并以透明背景色填充
                g.Clear(Color.Transparent);
                if (width < height)
                    g.DrawImage(image, new Rectangle(0, 0, newSize, newSize), new Rectangle(0, (height - width) / 2, width, width), GraphicsUnit.Pixel);
                else
                    g.DrawImage(image, new Rectangle(0, 0, newSize, newSize), new Rectangle((width - height) / 2, 0, height, height), GraphicsUnit.Pixel);                SaveImage(b, newFileName, GetCodecInfo("image/" + GetFormat(fileName).ToString().ToLower()));
            }
            finally
            {
                image.Dispose();
                b.Dispose();
            }
        }        /// <summary>
        /// 保存图片
        /// </summary>
        /// <param name="image">Image 对象</param>
        /// <param name="savePath">保存路径</param>
        /// <param name="ici">指定格式的编解码参数</param>
        private static void SaveImage(Image image, string savePath, ImageCodecInfo ici)
        {
            //设置 原图片 对象的 EncoderParameters 对象
            EncoderParameters parameters = new EncoderParameters(1);
            parameters.Param[0] = new EncoderParameter(Encoder.Quality, ((long)100));
            image.Save(savePath, ici, parameters);
            parameters.Dispose();
        }        /// <summary>
        /// 获取图像编码解码器的所有相关信息
        /// </summary>
        /// <param name="mimeType">包含编码解码器的多用途网际邮件扩充协议 (MIME) 类型的字符串</param>
        /// <returns>返回图像编码解码器的所有相关信息</returns>
        private static ImageCodecInfo GetCodecInfo(string mimeType)
        {
            ImageCodecInfo[] CodecInfo = ImageCodecInfo.GetImageEncoders();
            foreach (ImageCodecInfo ici in CodecInfo)
            {
                if (ici.MimeType == mimeType)
                    return ici;
            }
            return null;
        }