How to encode 16bpp grey images in Jpeg2000?

Question

Hi all.
First excuse me for my bad English.
I have a problem encoding JPEG2000 images. I have an image in a short array and I want to encode and seve it in a jpeg2000 file. I do the next:
(iw) is the JPEG2000 image writer.
SampleModel model =
RasterFactory.createBandedSampleModel(DataBuffer.TYPE_SHORT, w, h, 1);
WritableRaster raster = Raster.createWritableRaster(model, new Point(0, 0));
int ai1[] = new int[0];
for(int x = 0; x < w; ++x)
for(int y = 0; y < h; ++y)
ai1[0] = getPixel(x,y)
raster.setPixel(x, y, ai1);
iw.setOutput(fios);
iw.write(new IIOImage(raster,null,null));
fios.close();--------------------------------
The resulting image is corrupted.
If I set DataBuffer.TYPE_BYTE instead of DataBuffer.TYPE_SHORT it works fine but truncating data.
Then, How can I save 16bits grey image?
Thank you.
Edited by: francadaval on Mar 9, 2009 4:44 AM
Edited by: francadaval on Mar 9, 2009 4:48 AM
Edited by: francadaval on Mar 9, 2009 4:49 AM
Edited by: francadaval on Mar 9, 2009 4:50 AM

Answer 1

I can't reproduce this. I'm using JAI 1.1.3.
Are you sure that in this bit of code
int ai1[] = new int[0];
for(int x = 0; x < w; ++x)
    for(int y = 0; y < h; ++y)
        ai1[0] = getPixel(x,y);
        raster.setPixel(x, y, ai1);
}the method getPixel(x,y) is not returning 0?
Note that in this revised bit of code
SampleModel model =
     RasterFactory.createBandedSampleModel(DataBuffer.TYPE_USHORT, w, h, 1);
DataBuffer dBuffer = new DataBufferUShort(sPixs,w*h);
WritableRaster raster = Raster.createWritableRaster(model, dBuffer, new Point(0,0) );
iw.setOutput(fios);
iw.write(new IIOImage(raster,null,null));
fios.close();all you are doing is writing an empty image. You created a raster but don't set its elemnts. So the data buffer has all zeros (which is the color for black).