C#中图片切割，图片压缩，缩略图的生成

来源：互联网发布：物格而后知至,知至而后编辑：程序博客网时间：2024/04/29 19:28
**//// <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;     }
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