C#中图片切割,图片压缩,缩略图生成的代码

openkk 7年前

**//// <summary>      /// 图片切割函数      /// </summary>      /// <param name="sourceFile">原始图片文件</param>      /// <param name="xNum">在X轴上的切割数量</param>      /// <param name="yNum">在Y轴上的切割数量</param>      /// <param name="quality">质量压缩比</param>      /// <param name="outputFile">输出文件名,不带后缀</param>      /// <returns>成功返回true,失败则返回false</returns>      public static bool imageCut(String sourceFile, int xNum, int yNum, long quality, String outputFile)      {          try          {              long imageQuality                        =    quality;              Bitmap sourceImage                       =    new Bitmap(sourceFile);              ImageCodecInfo myImageCodecInfo          =    GetEncoderInfo("image/jpeg");              Encoder myEncoder                        =    Encoder.Quality;              EncoderParameters myEncoderParameters    =    new EncoderParameters(1);              EncoderParameter myEncoderParameter      =    new EncoderParameter(myEncoder, imageQuality);              myEncoderParameters.Param[0]             =    myEncoderParameter;              float xWidth                             =    sourceImage.Width / xNum;              float yWidth                             =    sourceImage.Height / yNum;              String outputImage                       =    "";                            for (int countY = 0; countY < yNum; countY++)                  for (int countX = 0; countX < xNum; countX++)                  {                        RectangleF cloneRect             =    new RectangleF(countX * xWidth, countY * yWidth, xWidth, yWidth);                      Bitmap newImage                  =    sourceImage.Clone(cloneRect, PixelFormat.Format24bppRgb);                      outputImage                      =    outputFile + countX + countY + ".jpg";                      newImage.Save(outputImage, myImageCodecInfo, myEncoderParameters);                    }              return true;          }          catch          {              return false;          }        }      #endregion imageCut        imageCompress  #region  imageCompress      /**//// <summary>      /// 图片压缩函数      /// </summary>      /// <param name="sourceFile">原始图片文件</param>      /// <param name="quality">质量压缩比</param>      /// <param name="ouputFile">输出文件名,请用 .jpg 后缀 </param>      /// <returns>成功返回true,失败则返回false</returns>      public static bool imageCompress(String sourceFile,long quality,String outputFile)      {          try          {              long imageQuality                      =    quality;              Bitmap sourceImage                     =    new Bitmap(sourceFile);              ImageCodecInfo myImageCodecInfo        =    GetEncoderInfo("image/jpeg");              Encoder myEncoder                      =    Encoder.Quality;              EncoderParameters myEncoderParameters  =    new EncoderParameters(1);              EncoderParameter myEncoderParameter    =    new EncoderParameter(myEncoder, imageQuality);              myEncoderParameters.Param[0]           =    myEncoderParameter;                           sourceImage.Save(outputFile, myImageCodecInfo, myEncoderParameters);              return true;            }          catch          {              return false;          }        }      #endregion imageCompress        getThumImage#region getThumImage      /**//// <summary>      /// 生成缩略图      /// </summary>      /// <param name="sourceFile">原始图片文件</param>      /// <param name="quality">质量压缩比</param>      /// <param name="multiple">收缩倍数</param>      /// <param name="outputFile">输出文件名</param>      /// <returns>成功返回true,失败则返回false</returns>      public static bool getThumImage(String sourceFile, long quality, int multiple, String outputFile)      {          try          {              long imageQuality                      =   quality;              Bitmap sourceImage                     =   new Bitmap(sourceFile);              ImageCodecInfo myImageCodecInfo        =   GetEncoderInfo("image/jpeg");              Encoder myEncoder                      =   Encoder.Quality;              EncoderParameters myEncoderParameters  =   new EncoderParameters(1);              EncoderParameter myEncoderParameter    =   new EncoderParameter(myEncoder, imageQuality);              myEncoderParameters.Param[0]           =   myEncoderParameter;              float xWidth                           =   sourceImage.Width;              float yWidth                           =   sourceImage.Height;              Bitmap newImage                        =   new Bitmap((int)(xWidth /multiple), (int)(yWidth /multiple));              Graphics g                             =   Graphics.FromImage(newImage);                            g.DrawImage(sourceImage, 0, 0, xWidth / multiple, yWidth / multiple);              g.Dispose();              newImage.Save(outputFile,myImageCodecInfo,myEncoderParameters);              return true;          }          catch          {              return false;          }      }      #endregion getThumImage        ImageCodecInfo#region ImageCodecInfo      /**//// <summary>      /// 获取图片编码信息      /// </summary>      private static ImageCodecInfo GetEncoderInfo(String mimeType)      {          int j;          ImageCodecInfo[] encoders;          encoders = ImageCodecInfo.GetImageEncoders();          for (j = 0; j < encoders.Length; ++j)          {              if (encoders[j].MimeType == mimeType)                  return encoders[j];          }          return null;      }