Java JLabel display a certain page of a multi-page TIFF

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Java

desktop

netbeans

I'm trying to display a TIFF Page on a JLabel, setting it as a icon. But it displays black image but the size is the same I guess. Anyone know whats the problem?

FileSeekableStream ss = new FileSeekableStream(filename);
ImageDecoder dec = ImageCodec.createImageDecoder("tiff", ss, null);
RenderedImage page = dec.decodeAsRenderedImage(0);

this.label = new JLabel();
this.label.setIcon(new ImageIcon(ConvertRenderedImage(page)));

public BufferedImage ConvertRenderedImage(RenderedImage img) {
    if (img instanceof BufferedImage) {
		return (BufferedImage)img;  
	}   
	ColorModel cm = img.getColorModel();
	int w = img.getWidth();
	int h = img.getHeight();
	WritableRaster raster = cm.createCompatibleWritableRaster(w, h);
	boolean isAlphaPremultiplied = cm.isAlphaPremultiplied();
	Hashtable properties = new Hashtable();
	String[] keys = img.getPropertyNames();
	if (keys!=null) {
		for (String key : keys) {
			properties.put(key, img.getProperty(key));
		}
	}
	BufferedImage result = new BufferedImage(cm, raster, isAlphaPremultiplied, properties);
	img.copyData(raster);
	return result;
}