C#图片切割、图片压缩、缩略图生成

C#图片切割、图片压缩、缩略图生成的实现代码

/// 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;

 }