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【CSharp】图片无损压缩

作者:wintersun / 发布于2012/7/9/ 729

图片无损压缩

<div>/// <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 static bool CompressImage(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.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 = 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), 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 = 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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