如何使用 Java OpenCV 库在图像上创建水印?
javaobject oriented programmingprogramming
以下 Java 示例在给定图像上绘制水印("Hello")并将其保存回去。
示例
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
public class WaterMarkExample {
public static void main(String[] args) throws IOException {
//读取图像的内容
File file = new File("D:\Images\test1.jpg");
BufferedImage img = ImageIO.read(file);
//创建一个空图像用于输出
int height = img.getHeight();
int width = img.getWidth();
BufferedImage res = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
//创建一个图形对象
Graphics graphics = res.getGraphics();
graphics.drawImage(img, 0, 0, null);
//创建水印字体
Font font = new Font("Arial", Font.PLAIN, 45);
graphics.setFont(font);
graphics.setColor(new Color(255, 150, 200, 30));
//在图片上绘制水印字符串
graphics.drawString("Hello", width/7, height/5);
//处理字符串
graphics.dispose();
//写入结果图像。
file = new File("D:\Images\watermark.jpg");
ImageIO.write(res, "jpg", file);
}
}
输入
输出
