dcm4che2 - How do you adjust window center and window width?

[Collin Walling]

I am creating a DICOM image viewer using the dcm4che2 library.

I want to adjust the window center and window width of an image. I tried using the methods defined 

for the DicomImageReadParam class to do this as the DICOM file is being read from my disk, but 

nothing is happening to the image. A piece of the code I used is below:

    File myDicomFile = new File(imagePath);

    BufferedImage myJpegImage = null;

    Iterator<ImageReader> iter = ImageIO.getImageReadersByFormatName("DICOM");

    ImageReader reader = (ImageReader) iter.next();

    DicomImageReadParam param = (DicomImageReadParam) reader.getDefaultReadParam();

        

    // Here is where I try to adjust the center and width

    param.setWindowCenter(center);

    param.setWindowWidth(width);

    // Read from the file and store it in the BufferedImage

    try {

        ImageInputStream iis = ImageIO.createImageInputStream(myDicomFile);

        reader.setInput(iis, false);

        myJpegImage = reader.read(0, param);

        iis.close();

        if (myJpegImage == null) {

            System.out.println("\nError: couldn't read dicom image!");

            return;

        }

        } catch (IOException e) {

        System.out.println("\nError: couldn't read dicom image!" + e.getMessage());

        return;

    }

// Below would be some swing code to display the BufferedImage on a frame.

Center and width are both predefined float variables.

I've also tried to run the dcm2jpg tool, providing the -c and -w arguments to see if I would

get any results, but to no avail.

Do the setWindowCenter and setWindowWidth actually affect the image at all? There is 

also a DicomImageReader class, maybe I should be using that instead of ImageReader?

Any advice would be appreciated.

Thank you.

- Collin

[ChadN]

You may also need

param.setAutoWindowing( false );

Otherwise, I think it computes the ww/wc and overrides what you entered in your param's.

[Collin Walling]

That seems to have done the trick... I should also note that I was attempting to apply these values to an

Ultrasound image, which I guess doesn't work too well?

Thanks for your post, I can work with it now.