C Picture Cutting Picture Compression Thumbnail Generation Code Summary

This article for everyone to sort out the C # picture cutting, picture compression, thumbnail generation of the implementation code, you can collect, convenient for later use, the specific content is as follows

///  Picture cutting function 
 /// </summary>
 /// <param name="sourceFile"> Original picture file </param>
 /// <param name="xNum"> Number of cuts on X axis </param>
 /// <param name="yNum"> Number of cuts on Y axis </param>
 /// <param name="quality"> Mass compression ratio </param>
 /// <param name="outputFile"> Output file name, without suffix </param>
 /// <returns> Successful return true If it fails, it returns 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>
 ///  Picture compression function 
 /// </summary>
 /// <param name="sourceFile"> Original picture file </param>
 /// <param name="quality"> Mass compression ratio </param>
 /// <param name="ouputFile"> Output file name , Please use  .jpg  Suffix  </param>
 /// <returns> Successful return true If it fails, it returns 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>
 ///  Generate thumbnails 
 /// </summary>
 /// <param name="sourceFile"> Original picture file </param>
 /// <param name="quality"> Mass compression ratio </param>
 /// <param name="multiple"> Shrinkage multiple </param>
 /// <param name="outputFile"> Output file name </param>
 /// <returns> Successful return true, Failure returns 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>
 ///  Get picture coding information 
 /// </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;
 }