Problem displaying TIFF BufferedImage. It's all black.

Question

Hello,
I am new to Java2D and I have a problem. I have a BufferedImage, bi1, created from a RenderedOp object (containing a grayscale TIFF image). I now would like to copy a part of bi1 to another BufferedImage, bi2. Creating and displaying bi1 works fine, but when I try to display bi2 it's all black. Since that is the default background color of BufferedImage, I guess this meens that my copying wasn't successful.
So my question is: How do I set the data in bi2 correctly?
Thanks in advance.
My code looks something like this:
FileSeekableStream stream = null;
try {
stream = new FileSeekableStream(args[0]);
} catch (IOException e) {
e.printStackTrace();
System.exit(0);
ParameterBlock params = new ParameterBlock();
params.add(stream);
TIFFDecodeParam decodeParam = new TIFFDecodeParam();
decodeParam.setDecodePaletteAsShorts(true);
RenderedOp image = JAI.create("tiff", params);
int tiff_width = image.getWidth();
int tiff_height = image.getHeight();
BufferedImage bi1 = image.getAsBufferedImage();
BufferedImage bi2 = new BufferedImage(tiff_width, (int)Math.round(tiff_height*0.35), BufferedImage.TYPE_BYTE_GRAY);
     bi2.getRaster().setRect(bi1.getData(new Rectangle(0,(int)Math.round(tiff_height*0.65),tiff_width,(int)Math.round(tiff_height*0.35))));
ScrollingImagePanel panel = new ScrollingImagePanel(bi2, tiff_width, tiff_height);
Frame window = new Frame("");
window.add(panel);
window.pack();
window.show();

Answer 1

The BufferedImage class has method
public BufferedImage getSubimage(int x, int y, int w, int h);
Probably you might use it
bi2=bi1.getSubImage(0,0, newWidth,newHeight);
hope this helps
Stas