/// <summary>

        /// 按指定的压缩质量及格式保存图片（微软的Image.Save方法保存到图片压缩质量为75)

        /// </summary>

        /// <param name="sourceImage">要保存的图片的Image对象</param>

        /// <param name="savePath">图片要保存的绝对路径</param>

        /// <param name="imageQualityValue">图片要保存的压缩质量，该参数的值为1至100的整数，数值越大，保存质量越好</param>

        /// <returns>保存成功，返回true；反之，返回false</returns>

        public bool SaveImageForSpecifiedQuality(System.Drawing.Image sourceImage, string savePath, int imageQualityValue)

        {

            //以下代码为保存图片时，设置压缩质量

            EncoderParameters encoderParameters = new EncoderParameters();

            EncoderParameter encoderParameter = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, imageQualityValue);

            encoderParameters.Param[0] = encoderParameter;

            try

            {

                ImageCodecInfo[] ImageCodecInfoArray = ImageCodecInfo.GetImageEncoders();

                ImageCodecInfo jpegImageCodecInfo = null;

                for (int i = 0; i < ImageCodecInfoArray.Length; i++)

                {

                    if (ImageCodecInfoArray[i].FormatDescription.Equals("JPEG"))

                    {

                        jpegImageCodecInfo = ImageCodecInfoArray[i];

                        break;

                    }

                }

                sourceImage.Save(savePath, jpegImageCodecInfo, encoderParameters);

                return true;

            }

            catch

            {

                return false;

            }

        }