public BufferedImage brightness(BufferedImage bi, float value)
	{
		BufferedImage buff = new BufferedImage(bi.getWidth(), bi.getHeight(), bi.getType());
		
		Kernel kernel = new Kernel(1, 1, new float[] {value});
		
		ConvolveOp op = new ConvolveOp(kernel);
		op.filter(bi, buff);
		
		return buff;
	}

mencoder video.3gp -o video.mpg -oac pcm -ovc lavc -lavcopts vcodec=mjpeg:mbd=1:vbitrate=1800

public BufferedImage toGray(BufferedImage bi)
	{
		ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);
		ColorConvertOp op = new ColorConvertOp(cs, null);
		
		return op.filter(bi, null);
	}