[vtkusers] Problem with using vtkJPEGWriter

[Ravi Samala]

Dear VTKUser's,

 

Objective: To write some data to a JPEG file.

Problem:   The final image is black color !

 

 

The code is as follows:

 

//****************************************************

// *****         Used to read 16 bit Image       *****

//****************************************************

vtkVolume16Reader *v16Img = vtkVolume16Reader::New();          

    v16Img->SetDataDimensions (sizex,sizey);

    v16Img->SetImageRange   (atoi(argv[3]),atoi(argv[4]));//Specify the number of slices to read

    v16Img->SetHeaderSize(HeadS); // Specify the number of bytes to seek over at start of image

    v16Img->SetFilePrefix (argv[2]);      //Specify the File prefix of all the slices (files)

    v16Img->SetDataSpacing (0.1, 0.1, 0.5);                 //Resolution along X, Y and Z axis

    v16Img->SetDataOrigin(0, 0, 0);

 

//****************************************************

// *****  Extracting a slice from the 3D volume  *****

//****************************************************

vtkImageReslice *imgResliceIn = vtkImageReslice::New();        

    imgResliceIn->SetInput(v16Img -> GetOutput());

    imgResliceIn->SetOutputSpacing(1,1,1);

    imgResliceIn->SetInterpolationModeToLinear();

    imgResliceIn->SetOutputOrigin(0, 0, 10);

    imgResliceIn->SetOutputExtent(0,312,0,499,0,0);

            

//****************************************************

// *****        Scaling the pixel range         ******

//****************************************************

vtkImageShiftScale *imgShSc =vtkImageShiftScale::New();

    imgShSc->SetInput(imgResliceIn -> GetOutput());

    imgShSc->SetScale(256/13000);

// $$ The input image pixel range is from 0 to 13000.

// $$ I wanted to convert the range from (0-13000)

// $$ to (0-255).

            

//****************************************************

// ***** Converting to Unsigned Char for JPEG writer *

//****************************************************

vtkImageCast *imgCastIn = vtkImageCast::New();

    imgCastIn->SetInput(imgShSc -> GetOutput());

    imgCastIn->SetOutputScalarTypeToUnsignedChar();           

            

//****************************************************

vtkJPEGWriter *jpegWrIn = vtkJPEGWriter::New();

    jpegWrIn->SetInput(imgCastIn -> GetOutput());

    jpegWrIn->SetFileName("Input10.jpg");

    jpegWrIn->Write();

//****************************************************

 

 

Thank you,

 

Ravi.


		
---------------------------------
 Yahoo! Music Unlimited - Access over 1 million songs. Try it free.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20051016/a09fc17f/attachment.htm>