/** {@inheritDoc} */
public void writeToStream(OutputStream os) throws IOException {
byte[] data = new byte[9];
copySF(data, Type.DESCRIPTOR, Category.OBJECT_AREA);
addTriplet(new DescriptorPositionTriplet(OBJECT_AREA_POSITION_ID));
addTriplet(new MeasurementUnitsTriplet(widthRes, heightRes));
addTriplet(new ObjectAreaSizeTriplet(width, height));
/* not allowed in Presentation Interchange Set 1
addTriplet(new PresentationSpaceResetMixingTriplet(
PresentationSpaceResetMixingTriplet.NOT_RESET));