Java圖片去水印

在Java中實現圖片去水印需要結合圖像處理技術。以下是一個基于ImageIO庫的簡單示例，用于去除矩形區域的水印：

```java

import javax.imageio.ImageIO;

import javax.imageio.ImageReader;

import javax.imageio.metadata.IIOMetadata;

import javax.imageio.metadata.IIOMetadataNode;

import javax.imageio.stream.ImageInputStream;

import java.awt.;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

public class ImageWatermarkRemover {

public static void removeWatermark(String inputPath, String outputPath, int x, int y, int width, int height) throws IOException {
// 讀取圖片
File file = new File(inputPath);
ImageInputStream iis = ImageIO.createImageInputStream(file);
ImageReader reader = ImageIO.getImageReader(iis);
iis.close();
reader.read(0);
// 獲取圖片信息
IIOMetadata metadata = reader.getMetadata();
IIOMetadataNode root = (IIOMetadataNode) metadata tree;
Rectangle watermarkRect = new Rectangle(x, y, width, height);
// 創建新圖片
BufferedImage image = reader.read(0);
int widthImage = image.getWidth();
int heightImage = image.getHeight();
BufferedImage newImage = new BufferedImage(widthImage, heightImage, BufferedImage.TYPE_INT_ARGB);
// 復制像素
Graphics2D g = newImage.createGraphics();
g.drawImage(image, 0, 0, null);
g.setComposite(Composite.Copy);
// 去除水印區域
for (int i = watermarkRect.x; i < watermarkRect.x + watermarkRect.width; i++) {
for (int j = watermarkRect.y; j < watermarkRect.y + watermarkRect.height; j++) {
Color color = new Color(image.getRGB(i, j));
color.setAlpha(0); // 設置為透明
newImage.setRGB(i, j, color.getRGB());