DICOM_save.cpp

//Open the DICOM file and get the dictionary
DcmFileFormat fileformat;
OFCondition status = fileformat.loadFile(file);
DcmDataset *dictionary;
if (status.good())				
  dictionary = fileformat.getDataset();

/////////////////////////////////////////
//  Modify anything in the DICOM file  //
/////////////////////////////////////////

//Get the transfer syntax to check if we need jpeg codecs
E_TransferSyntax xfer = dictionary->getOriginalXfer();
if(xfer >= EXS_JPEGProcess1TransferSyntax && xfer <= EXS_JPEGProcess14SV1TransferSyntax )
{
  DJEncoderRegistration::registerCodecs(); // register JPEG codecs

  DJ_RPLossless params; // codec parameters, we use the defaults
  // this causes the lossless JPEG version of the dataset to be created
  dictionary->chooseRepresentation(xfer, &params);
}

DcmItem *metaInfo = fileformat->getMetaInfo();
// force the meta-header UIDs to be re-generated when storing the file
// since the UIDs in the data set may have changed
delete metaInfo->remove(DCM_MediaStorageSOPClassUID);
delete metaInfo->remove(DCM_MediaStorageSOPInstanceUID);

fileformat->loadAllDataIntoMemory();
if( EC_Normal != fileformat->saveFile(filePath.toStdString().c_str(), xfer) )
  std::cout << "Cannot update the image." std::endl;
	
if(xfer >= EXS_JPEGProcess1TransferSyntax && xfer <= EXS_JPEGProcess14SV1TransferSyntax )
  DJEncoderRegistration::cleanup();