C#圖片壓縮演算法

/// <summary>    /// 壓縮圖片 /// </summary>    /// <param name="fileStream">圖片流</param>    /// <param name="quality">壓縮質量0-100之間 數值越大質量越高</param>    /// <returns></returns>    private byte[] CompressionImage(Stream fileStream, long quality) {        using (System.Drawing.Image img = System.Drawing.Image.FromStream(fileStream)) {            using (Bitmap bitmap = new Bitmap(img)) {                ImageCodecInfo CodecInfo = GetEncoder(img.RawFormat);                System.Drawing.Imaging.Encoder myEncoder = System.Drawing.Imaging.Encoder.Quality;                EncoderParameters myEncoderParameters = new EncoderParameters(1);                EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, quality);                myEncoderParameters.Param[0] = myEncoderParameter;                using (MemoryStream ms = new MemoryStream()) {                    bitmap.Save(ms, CodecInfo, myEncoderParameters);                    myEncoderParameters.Dispose();                    myEncoderParameter.Dispose();                    return ms.ToArray();                }            }        }    }調用:CompressionImage(stream,0L)//最低質量 1M jpg圖大概能壓成180k左右