C#按指定质量保存图片的实现代码

/// <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; www.jb200.com
    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;
      }
  }

//按指定质量保存图片，提高图片保存质量。
System.Drawing.Image image = System.Drawing.Image.FromFile("D:TestImage.jpg");
SaveImageForSpecifiedQuality(image, "D:TestImage1.jpg", 100, ImageFormat.Jpeg);image.Dispose();