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Java - Brightness

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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;