请教高手 GDI+ 如何设置缩略图的图片质量？这段代码应该如何改？

[lijing3333]

 public void CreateMinImage(string originalImagePath, string thumbnailPath, int width, int height, int isThumbnail)
        {
            System.Drawing.Image originalImage = System.Drawing.Image.FromFile(HttpContext.Current.Server.MapPath(originalImagePath));

            int towidth = width;
            int toheight = height;

            int ow = originalImage.Width;
            int oh = originalImage.Height;

            if (isThumbnail.Equals(1))
            {

                if (originalImage.Width / originalImage.Height >= width / height)
                {
                    if (originalImage.Width > width)
                    {
                        towidth = width;
                        toheight = (originalImage.Height * width) / originalImage.Width;
                    }
                    else
                    {
                        towidth = originalImage.Width;
                        toheight = originalImage.Height;
                    }
                }
                else
                {
                    if (originalImage.Height > height)
                    {
                        toheight = height;
                        towidth = (originalImage.Width * height) / originalImage.Height;
                    }
                    else
                    {
                        towidth = originalImage.Width;
                        toheight = originalImage.Height;
                    }
                }
            }

            //新建一个bmp图片
            System.Drawing.Image bitmap = new System.Drawing.Bitmap(towidth, toheight);

            //新建一个画板
            System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap);


            //设置高质量插值法
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;

            //设置高质量,低速度呈现平滑程度
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

            //清空画布并以透明背景色填充
            g.Clear(System.Drawing.Color.Transparent);

            //在指定位置并且按指定大小绘制原图片的指定部分
            g.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, towidth, toheight));

            try
            {
                //以jpg格式保存缩略图
                string FileExt = Path.GetFileNameWithoutExtension(originalImagePath);
                bitmap.Save(HttpContext.Current.Server.MapPath(thumbnailPath) + FileExt + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
            }
            catch (System.Exception e)
            {
                throw e;
            }
            finally
            {
                originalImage.Dispose();
                bitmap.Dispose();
                g.Dispose();
            }

        }

这是我现在用的。。 但是图片缩略的太小了。。 才8kb 导致图片质量很不好。。。 这段代码如何修改 让缩略的图片质量高一点？ 我看网上他们的缩略图片效果都挺好的 也才20kb 请教了！！！

[lijing3333]

沉的这么快啊！！！ 没人啊

[lijing3333]

[蝶恋花雨]

你的宽高多少？

[liukaizxc]

 /// <summary>
    /// asp.net上传图片并生成缩略图
    /// </summary>
    /// <param name="upImage">HtmlInputFile控件</param>
    /// <param name="sSavePath">保存的路径,些为相对服务器路径的下的文件夹</param>
    /// <param name="sThumbExtension">缩略图的thumb</param>
    /// <param name="intThumbWidth">生成缩略图的宽度</param>
    /// <param name="intThumbHeight">生成缩略图的高度</param>
    /// <returns>缩略图名称</returns>
    public string UpLoadImage(HtmlInputFile upImage, string sSavePath, string sThumbExtension, int intThumbWidth, int intThumbHeight, string BigName)
    {
        string sThumbFile = "";
        string sFilename = "";
        if (upImage.PostedFile != null)
        {
            HttpPostedFile myFile = upImage.PostedFile;
            int nFileLen = myFile.ContentLength;
            if (nFileLen == 0)
                return "没有选择上传图片";
            //获取upImage选择文件的扩展名
            string extendName = System.IO.Path.GetExtension(myFile.FileName).ToLower();
            //判断是否为图片格式
            if (extendName != ".jpg" && extendName != ".jpge" && extendName != ".gif" && extendName != ".bmp" && extendName != ".png")
                return "图片格式不正确";
            byte[] myData = new Byte[nFileLen];
            myFile.InputStream.Read(myData, 0, nFileLen);
            sFilename = System.IO.Path.GetFileName(myFile.FileName);
            int file_append = 0;
            //检查当前文件夹下是否有同名图片,有则在文件名+1
            while (System.IO.File.Exists(System.Web.HttpContext.Current.Server.MapPath(sSavePath + sFilename)))
            {
                file_append++;
                sFilename = System.IO.Path.GetFileNameWithoutExtension(myFile.FileName)
                + file_append.ToString() + extendName;
            }
            System.IO.FileStream newFile
            = new System.IO.FileStream(System.Web.HttpContext.Current.Server.MapPath(sSavePath + sFilename),
            System.IO.FileMode.Create, System.IO.FileAccess.Write);
            newFile.Write(myData, 0, myData.Length);
            newFile.Close();
            //以上为上传原图
            try
            {
                //原图加载
                using (System.Drawing.Image sourceImage = System.Drawing.Image.FromFile(System.Web.HttpContext.Current.Server.MapPath(sSavePath + BigName)))
                {
                    //原图宽度和高度
                    int width = sourceImage.Width;
                    int height = sourceImage.Height;
                    int smallWidth;
                    int smallHeight;
                    //获取第一张绘制图的大小,(比较 原图的宽/缩略图的宽 和 原图的高/缩略图的高)
                    if (((decimal)width) / height <= ((decimal)intThumbWidth) / intThumbHeight)
                    {
                        smallWidth = intThumbWidth;
                        smallHeight = intThumbWidth * height / width;
                    }
                    else
                    {
                        smallWidth = intThumbHeight * width / height;
                        smallHeight = intThumbHeight;
                    }
                    //判断缩略图在当前文件夹下是否同名称文件存在
                    file_append = 0;
                    sThumbFile = sThumbExtension + System.IO.Path.GetFileNameWithoutExtension(myFile.FileName) + extendName;
                    while (System.IO.File.Exists(System.Web.HttpContext.Current.Server.MapPath(sSavePath + sThumbFile)))
                    {
                        file_append++;
                        sThumbFile = sThumbExtension + System.IO.Path.GetFileNameWithoutExtension(myFile.FileName) +
                        file_append.ToString() + extendName;
                    }
                    //缩略图保存的绝对路径
                    string smallImagePath = System.Web.HttpContext.Current.Server.MapPath(sSavePath) + sThumbFile;
                    //新建一个图板,以最小等比例压缩大小绘制原图
                    using (System.Drawing.Image bitmap = new System.Drawing.Bitmap(smallWidth, smallHeight))
                    {
                        //绘制中间图
                        using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap))
                        {
                            //高清,平滑
                            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
                            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                            g.Clear(Color.Transparent);
                            g.DrawImage(
                            sourceImage,
                            new System.Drawing.Rectangle(0, 0, smallWidth, smallHeight),
                            new System.Drawing.Rectangle(0, 0, width, height),
                            System.Drawing.GraphicsUnit.Pixel
                            );
                        }
                        //新建一个图板,以缩略图大小绘制中间图
                        using (System.Drawing.Image bitmap1 = new System.Drawing.Bitmap(intThumbWidth, intThumbHeight))
                        {
                            //绘制缩略图
                            using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap1))
                            {
                                //高清,平滑
                                g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
                                g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                                g.Clear(Color.Transparent);
                                int lwidth = (smallWidth - intThumbWidth) / 2;
                                int bheight = (smallHeight - intThumbHeight) / 2;
                                g.DrawImage(bitmap, new Rectangle(0, 0, intThumbWidth, intThumbHeight), lwidth, bheight, intThumbWidth, intThumbHeight, GraphicsUnit.Pixel);
                                g.Dispose();
                                bitmap1.Save(smallImagePath, System.Drawing.Imaging.ImageFormat.Jpeg);
                            }
                        }
                    }
                }
            }
            catch
            {
                //出错则删除
                System.IO.File.Delete(System.Web.HttpContext.Current.Server.MapPath(sSavePath + sFilename));
                return "图片格式不正确";
            }
            //返回缩略图名称
            return sThumbFile;
        }
        return "没有选择图片";
    }

我用的是这个缩略图代码

[蝶恋花雨]

http://blog.csdn.net/kongwei521/article/details/6871515
么看有什么差别。是不是你设置的生成宽高 小了