C#无损压缩图片

概述话不多说，请看代码：///<summary>///根据指定尺寸得到按比例缩放的尺寸,返回true表示以更改尺寸

话不多说，请看代码：

/// <summary>    /// 根据指定尺寸得到按比例缩放的尺寸,返回true表示以更改尺寸    /// </summary>    /// <param name="picWIDth">图片宽度</param>    /// <param name="picHeight">图片高度</param>    /// <param name="specifIEDWIDth">指定宽度</param>    /// /// <param name="specifIEdHeight">指定高度</param>    /// <returns>返回true表示以更改尺寸</returns>    private bool GetPicZoomSize(ref int picWIDth,ref int picHeight,int specifIEDWIDth,int specifIEdHeight)    {      int sW = 0,sH = 0;      Boolean isZoomSize = false;      //按比例缩放      Size tem_size = new Size(picWIDth,picHeight);      if (tem_size.WIDth > specifIEDWIDth || tem_size.Height > specifIEdHeight) //将**改成c#中的或者 *** 作符号      {        if ((tem_size.WIDth * specifIEdHeight) > (tem_size.Height * specifIEDWIDth))        {          sW = specifIEDWIDth;          sH = (specifIEDWIDth * tem_size.Height) / tem_size.WIDth;        }        else        {          sH = specifIEdHeight;          sW = (tem_size.WIDth * specifIEdHeight) / tem_size.Height;        }        isZoomSize = true;      }      else      {        sW = tem_size.WIDth;        sH = tem_size.Height;      }      picHeight = sH;      picWIDth = sW;      return isZoomSize;    }    /// <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">宽度</param>    /// <param name="flag">压缩质量 1-100</param>    /// <returns></returns>    public bool GetPicthumbnail(string sfile,string dfile,int dHeight,int DWIDth,int flag)    {      System.Drawing.Image iSource = System.Drawing.Image.Fromfile(sfile);      ImageFormat tFormat = iSource.RawFormat;      int sW = iSource.WIDth,sH = iSource.Height;      GetPicZoomSize(ref sW,ref sH,DWIDth,dHeight);      Bitmap ob = new Bitmap(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,new Rectangle((DWIDth - sW) / 2,(dHeight - sH) / 2,sW,sH),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 = new EncoderParameters();      long[] qy = new long[1];      qy[0] = flag;//设置压缩的比例1-100      EncoderParameter eParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality,qy);      ep.Param[0] = eParam;      try      {        ImageCodecInfo[] arrayICI = ImageCodecInfo.GetimageEncoders();        ImageCodecInfo jpegICIinfo = null;        for (int x = 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);        }        return true;      }      catch      {        return false;      }      finally      {        iSource.dispose();        ob.dispose();      }    }

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