Java Code to Create a Buffered Image of TYPE_BYTE_BINARY

byte[] cMap = new byte[] {(byte)(255),(byte)(0)};
IndexColorModel colorModel = new IndexColorModel(1, 2, cMap, cMap, cMap);

BufferedImage combined = new BufferedImage(
                            buf1.getWidth(), 
                            buf1.getHeight() + buf2.getHeight() ,
                            BufferedImage.TYPE_BYTE_BINARY );

byte[] data = ((DataBufferByte) src.getRaster().getDataBuffer()).getData();
for(int i = 0; i < data.length; i++) {
    data[i] =(byte) (~data[i] & 0xff);
}