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Some utilities for Java development
There is a newer version: 1.3.8.1
package devutility.internal.awt.image;

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Font;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.IOException;

import devutility.internal.awt.RenderingHintsUtils;
import devutility.internal.awt.position.Positioner;
import devutility.internal.awt.position.string.StringBottomRightPosition;

public class WatermarkUtils {
	/**
	 * Add watermark in image, save the new image to provided imagePath.
	 * @param image Original BufferedImage object.
	 * @param text Watermark text.
	 * @param font Font object for watermark.
	 * @param color Color object for watermark.
	 * @param renderingHints RenderingHints object.
	 * @param alphaComposite AlphaComposite object.
	 * @param imagePath Path for new image.
	 * @throws IOException Throw when File not found or writed failed.
	 */
	public static void bottomRightString(BufferedImage image, String text, Font font, Color color, RenderingHints renderingHints, AlphaComposite alphaComposite, String imagePath) throws IOException {
		Positioner positioner = new StringBottomRightPosition(15f, 15f);
		ImageUtils.drawString(image, text, 0, font, color, positioner, renderingHints, alphaComposite, imagePath);
	}

	/**
	 * Add watermark in image, save the new image to provided imagePath.
	 * @param image Original BufferedImage object.
	 * @param text Watermark text.
	 * @param font Font object for watermark.
	 * @param color Color object for watermark.
	 * @param renderingHints RenderingHints object.
	 * @param alpha Alpha percentage in float, range from 0 to 1f, for example 0.5f.
	 * @param imagePath Path for new image.
	 * @throws IOException Throw when File not found or writed failed.
	 */
	public static void bottomRightString(BufferedImage image, String text, Font font, Color color, RenderingHints renderingHints, float alpha, String imagePath) throws IOException {
		bottomRightString(image, text, font, color, renderingHints, AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alpha), imagePath);
	}

	/**
	 * Add watermark in image, save the new image to provided imagePath.
	 * @param image Original BufferedImage object.
	 * @param text Watermark text.
	 * @param font Font object for watermark.
	 * @param color Color object for watermark.
	 * @param alpha Alpha percentage in float, range from 0 to 1f, for example 0.5f.
	 * @param imagePath Path for new image.
	 * @throws IOException Throw when File not found or writed failed.
	 */
	public static void bottomRightString(BufferedImage image, String text, Font font, Color color, float alpha, String imagePath) throws IOException {
		bottomRightString(image, text, font, color, RenderingHintsUtils.highQuality(), alpha, imagePath);
	}
}