C # Picture Lossless compression

Using System.Drawing.Imaging;
Using System.Drawing;
Using System.Drawing.Drawing2D;

#region GetPicThumbnail    /// <summary>    /// 无损压缩图片    /// </summary>    /// <param name="sFile">原图片</param>    /// <param name="dFile">压缩后保存位置</param>    /// <param name="dHeight">高度</param>    /// <param name="dWidth"></param>    /// <param name="flag">压缩质量 1-100</param>    /// <returns></returns>    publicboolGetPicThumbnail(stringsFile, stringdFile, intdHeight, intdWidth, intflag)    {        System.Drawing.Image iSource = System.Drawing.Image.FromFile(sFile);         ImageFormat tFormat = iSource.RawFormat;        intsW = 0, sH = 0;        //按比例缩放        Size tem_size = newSize(iSource.Width, iSource.Height);         if(tem_size.Width > dHeight || tem_size.Width > dWidth) //将**改成c#中的或者操作符号        {            if((tem_size.Width * dHeight) > (tem_size.Height * dWidth))            {                 sW = dWidth;                sH = (dWidth * tem_size.Height) / tem_size.Width;            }            else            {                sH = dHeight;                sW = (tem_size.Width * dHeight) / tem_size.Height;            }        }        else        {            sW = tem_size.Width;            sH = tem_size.Height;        }        Bitmap ob = newBitmap(dWidth, dHeight);        Graphics g = Graphics.FromImage(ob);        g.Clear(Color.WhiteSmoke);        g.CompositingQuality = CompositingQuality.HighQuality;        g.SmoothingMode = SmoothingMode.HighQuality;         g.InterpolationMode = InterpolationMode.HighQualityBicubic;        g.DrawImage(iSource, newRectangle((dWidth - sW) / 2, (dHeight - sH) / 2, sW, sH), 0, 0, iSource.Width, iSource.Height, GraphicsUnit.Pixel);        g.Dispose();        //以下代码为保存图片时，设置压缩质量         EncoderParameters ep = newEncoderParameters();        long[] qy = newlong[1];        qy[0] = flag;//设置压缩的比例1-100         EncoderParameter eParam = newEncoderParameter(System.Drawing.Imaging.Encoder.Quality, qy);        ep.Param[0] = eParam;        try        {            ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();            ImageCodecInfo jpegICIinfo = null;            for(intx = 0; x < arrayICI.Length; x++)            {                if(arrayICI[x].FormatDescription.Equals("JPEG"))                {                    jpegICIinfo = arrayICI[x];                     break;                }            }            if(jpegICIinfo != null)            {                ob.Save(dFile, jpegICIinfo, ep);//dFile是压缩后的新路径            }            else            {                ob.Save(dFile, tFormat);            }            returntrue;         }        catch        {            returnfalse;        }         finally        {            iSource.Dispose();            ob.Dispose();        }    }    #endregion

C # Picture Lossless compression