C#无损高质量压缩图片代码

概述本文实例为大家分享了C#无损高质量压缩图片的具体代码，供大家参考，具体内容如下

本文实例为大家分享了C#无损高质量压缩图片的具体代码，供大家参考，具体内容如下

/// 无损压缩图片  /// <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(数字越小压缩率越高) 1-100</param>  /// <returns></returns>   public static 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 = 0,sH = 0;    //按比例缩放   Size tem_size = new Size(iSource.WIDth,iSource.Height);    if (tem_size.WIDth > dHeight || tem_size.WIDth > DWIDth)   {     if ((tem_size.WIDth * dHeight) > (tem_size.WIDth * 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 = new Bitmap(DWIDth,dHeight);   Graphics g = Graphics.FromImage(ob);    g.Clear(@[email protected]);   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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