DCM file not compressing properly.

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C#3.5

hi,
I am compressing dicom images using GDCM Tool but image is not compressed properly. I am Posting the Sample Code.

What I have tried:

My code is as follow:
string inputFileNamepath = @"G:\Test\Test_07_06_2016\Source\CT-MONO2-16-ankle.dcm";
string outputFileNamepath = @"G:\Test\Test_07_06_2016\Source1\CT-MONO2-16-ankle.dcm";

//FileInfo file = new FileInfo(@"G:\Test\Test_07_06_2016\Source\BU001015MN-166-CL-001V01_2005101414120923_1_1.dcm");

string extension = Path.GetExtension(inputFileNamepath);
inputFileName = Path.GetFileName(inputFileNamepath);

outputFileName = Path.GetFileName(outputFileNamepath);

try
{
gdcm.ImageReader reader = new ImageReader();
reader.SetFileName(inputFileNamepath);
if (!reader.Read())
{
//System.Console.WriteLine("Could not read: " + filename);
MessageBox.Show("Error ");
return;
}


gdcm.File file = reader.GetFile();

gdcm.DataSet ds = file.GetDataSet();
gdcm.Image image = reader.GetImage();

ImageChangeTransferSyntax change = new ImageChangeTransferSyntax();
TransferSyntax targets = new TransferSyntax(TransferSyntax.TSType.JPEG2000Lossless);
change.SetTransferSyntax(targets);

JPEGCodec codec = new JPEGCodec();

if(!codec.CanCode(targets))
{
// MessageBox.Show("WrongData");
//return;
}
codec.SetLossless(false);
codec.SetQuality(90); // poor quality !
change.SetUserCodec(codec); // specify the codec to use to the ImageChangeTransferSyntax

change.SetInput(image);

bool b = change.Change();

if (!b)
{
MessageBox.Show("Can not change Ttansfer Syntax");
//return;
}

ImageWriter writer = new ImageWriter();
writer.SetImage((gdcm.Image)change.GetOutput());
writer.SetFile(reader.GetFile());
writer.SetFileName(outputFileNamepath);

if (!writer.Write())
{
MessageBox.Show("Could not write");
}




}
catch (Exception ex)
{

}