Javaで画像に透かしを入れるにはどうすればよいですか？

Question

Javaを使用して画像に透かしを作成するにはどうすればよいですか？ユーザーが入力したテキストを画像上の指定された位置に追加する必要があります。サンプルコード/提案が役に立ちます。

Answer 1

http://web.archive.org/web/20080324030029/http://blog.codebeach.com/2008/02/watermarking-images-）の「透かしの描画」セクションを参照してください。 in-Java-servlet.html

または、GIF4Jライブラリを使用することもできます http://www.gif4j.com/Java-gif4j-pro-gif-image-watermark.htm#gifimagewatermarkapply

Answer 2

Thumbnailator では、 Caption 画像フィルターを使用して既存の画像にテキストキャプションを追加できます。

// Image to add a text caption to.
BufferedImage originalImage = ...;

// Set up the caption properties
String caption = "Hello World";
Font font = new Font("Monospaced", Font.PLAIN, 14);
Color c = Color.black;
Position position = Positions.CENTER;
int insetPixels = 0;

// Apply caption to the image
Caption filter = new Caption(caption, font, c, position, insetPixels);
BufferedImage captionedImage = filter.apply(originalImage);

上記のコードでは、テキストHello Worldは、originalImageを中心に、等幅フォント、前景色が黒、14ポイントで描画されます。

または、透かし画像を既存の画像に適用する場合は、 Watermark 画像フィルターを使用できます。

BufferedImage originalImage = ...;
BufferedImage watermarkImage = ...;

Watermark filter = new Watermark(Positions.CENTER, watermarkImage, 0.5f);
BufferedImage watermarkedImage = filter.apply(originalImage);

上記のコードは、不透明度50％を中心に、watermarkImageの上にoriginalImageを重ね合わせます。

Thumbnailatorは、昔ながらのJava SE-サードパーティのライブラリをインストールする必要はありません（ただし、Sun Javaランタイムが必要です）で実行されます。 ）

完全な開示：私はThumbnailatorの開発者です。

Answer 3

最近同様のニーズがあり、この投稿はかなり役に立ちました： http://www.codeyouneed.com/Java-watermark-image/

そこでの透かしメソッドは、必要に応じて透かしのサイズを変更するためにImgScalrを使用し、画像の下部/上部+透かし画像へのテキストの配置をサポートします。

正しい配置を選択するために、単純なENUMを使用します

public enum PlacementPosition {
    TOPLEFT, TOPCENTER, TOPRIGHT, MIDDLELEFT, MIDDLECENTER, MIDDLERIGHT, BOTTOMLEFT, BOTTOMCENTER, BOTTOMRIGHT
}

そして、透かしロジック全体はこの方法にあります：

/**
 * Generate a watermarked image.
 * 
 * @param originalImage
 * @param watermarkImage
 * @param position
 * @param watermarkSizeMaxPercentage
 * @return image with watermark
 * @throws IOException
 */
public static BufferedImage watermark(BufferedImage originalImage,
        BufferedImage watermarkImage, PlacementPosition position,
        double watermarkSizeMaxPercentage) throws IOException {

    int imageWidth = originalImage.getWidth();
    int imageHeight = originalImage.getHeight();

    int watermarkWidth = getWatermarkWidth(originalImage, watermarkImage,
            watermarkSizeMaxPercentage);
    int watermarkHeight = getWatermarkHeight(originalImage, watermarkImage,
            watermarkSizeMaxPercentage);

    // We create a new image because we want to keep the originalImage
    // object intact and not modify it.
    BufferedImage bufferedImage = new BufferedImage(imageWidth,
            imageHeight, BufferedImage.TYPE_INT_RGB);
    Graphics2D g2d = (Graphics2D) bufferedImage.getGraphics();
    g2d.drawImage(originalImage, 0, 0, null);
    g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
            RenderingHints.VALUE_ANTIALIAS_ON);

    int x = 0;
    int y = 0;
    if (position != null) {
        switch (position) {
        case TOPLEFT:
            x = 0;
            y = 0;
            break;
        case TOPCENTER:
            x = (imageWidth / 2) - (watermarkWidth / 2);
            y = 0;
            break;
        case TOPRIGHT:
            x = imageWidth - watermarkWidth;
            y = 0;
            break;

        case MIDDLELEFT:
            x = 0;
            y = (imageHeight / 2) - (watermarkHeight / 2);
            break;
        case MIDDLECENTER:
            x = (imageWidth / 2) - (watermarkWidth / 2);
            y = (imageHeight / 2) - (watermarkHeight / 2);
            break;
        case MIDDLERIGHT:
            x = imageWidth - watermarkWidth;
            y = (imageHeight / 2) - (watermarkHeight / 2);
            break;

        case BOTTOMLEFT:
            x = 0;
            y = imageHeight - watermarkHeight;
            break;
        case BOTTOMCENTER:
            x = (imageWidth / 2) - (watermarkWidth / 2);
            y = imageHeight - watermarkHeight;
            break;
        case BOTTOMRIGHT:
            x = imageWidth - watermarkWidth;
            y = imageHeight - watermarkHeight;
            break;

        default:
            break;
        }
    }

    g2d.drawImage(Scalr.resize(watermarkImage, Method.ULTRA_QUALITY,
            watermarkWidth, watermarkHeight), x, y, null);

    return bufferedImage;

}

また、透かしサイズを計算するための対応する方法は次のとおりです。

/**
 * 
 * @param originalImage
 * @param watermarkImage
 * @param maxPercentage
 * @return
 */
private static Pair<Double, Double> calculateWatermarkDimensions(
        BufferedImage originalImage, BufferedImage watermarkImage,
        double maxPercentage) {

    double imageWidth = originalImage.getWidth();
    double imageHeight = originalImage.getHeight();

    double maxWatermarkWidth = imageWidth / 100.0 * maxPercentage;
    double maxWatermarkHeight = imageHeight / 100.0 * maxPercentage;

    double watermarkWidth = watermarkImage.getWidth();
    double watermarkHeight = watermarkImage.getHeight();

    if (watermarkWidth > maxWatermarkWidth) {
        double aspectRatio = watermarkWidth / watermarkHeight;
        watermarkWidth = maxWatermarkWidth;
        watermarkHeight = watermarkWidth / aspectRatio;
    }

    if (watermarkHeight > maxWatermarkHeight) {
        double aspectRatio = watermarkWidth / watermarkHeight;
        watermarkHeight = maxWatermarkHeight;
        watermarkWidth = watermarkHeight / aspectRatio;
    }

    return Pair.of(watermarkWidth, watermarkHeight);
}

/**
 * 
 * @param originalImage
 * @param watermarkImage
 * @param maxPercentage
 * @return
 */
public static int getWatermarkWidth(BufferedImage originalImage,
        BufferedImage watermarkImage, double maxPercentage) {

    return calculateWatermarkDimensions(originalImage, watermarkImage,
            maxPercentage).getLeft().intValue();

}

/**
 * 
 * @param originalImage
 * @param watermarkImage
 * @param maxPercentage
 * @return
 */
public static int getWatermarkHeight(BufferedImage originalImage,
        BufferedImage watermarkImage, double maxPercentage) {

    return calculateWatermarkDimensions(originalImage, watermarkImage,
            maxPercentage).getRight().intValue();

}

繰り返しになりますが、Niceサンプルの場合は http://www.codeyouneed.com/Java-watermark-image/ へのすべてのクレジット。

Answer 4

私は自分のプロジェクトに使用しました IM4Javaライブラリ -Java用のimagemagickラッパー。透かしの例については、 http://www.imagemagick.org/Usage/annotating/ を参照してください。

Answer 5

以下は、画像に透かしを追加するためのコードです

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;
import javax.swing.ImageIcon;

public class WatermarkImage {

  public static void main(String[] args) {

        File origFile = new File("C:/OrignalImage.jpg");
        ImageIcon icon = new ImageIcon(origFile.getPath());

        // create BufferedImage object of same width and height as of original image
        BufferedImage bufferedImage = new BufferedImage(icon.getIconWidth(),
                    icon.getIconHeight(), BufferedImage.TYPE_INT_RGB);

        // create graphics object and add original image to it
        Graphics graphics = bufferedImage.getGraphics();
        graphics.drawImage(icon.getImage(), 0, 0, null);

        // set font for the watermark text
        graphics.setFont(new Font("Arial", Font.BOLD, 30));

        //unicode characters for (c) is \u00a9
        String watermark = "\u00a9 JavaXp.com";

        // add the watermark text
        graphics.drawString(watermark, 0, icon.getIconHeight() / 2);
        graphics.dispose();

        File newFile = new File("C:/WatermarkedImage.jpg");
        try {
              ImageIO.write(bufferedImage, "jpg", newFile);
        } catch (IOException e) {
              e.printStackTrace();
        }

        System.out.println(newFile.getPath() + " created successfully!");

  }

}

Answer 6

このコードを使用すると、機能します。ここでは、画像が透かしとして使用され、場所10,10に配置されます。

import Java.awt.Graphics;
import Java.awt.image.BufferedImage;
import Java.io.File;
import Java.io.IOException;
import javax.imageio.ImageIO;

public class WatermarkImage {

  public static void addWatermark(String localImagePath) {

    try {
        BufferedImage image = ImageIO.read(new File(localImagePath));
        BufferedImage overlay = ImageIO.read(new File(".\\data\\watermark\\watermark.png"));

        // create the new image, canvas size is the max. of both image sizes
        int w = Math.max(image.getWidth(), overlay.getWidth());
        int h = Math.max(image.getHeight(), overlay.getHeight());
        BufferedImage combined = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);

        // Paint both images, preserving the alpha channels
        Graphics g = combined.getGraphics();
        g.drawImage(image, 0, 0, null);
        g.drawImage(overlay, 10, 0, null);

        ImageIO.write(combined, "PNG", new File(localImagePath));
    } catch (IOException e) {
        e.printStackTrace();
    }
  }
}

Answer 7

WindowsのC：\ Imagemagickフォルダーに最初にインストールされたImagemagick

http://www.imagemagick.org/download/binaries/ImageMagick-6.8.8-7-Q16-x86-dll.exe

インストール中にC：\ ImageMagickを追加します。 PATH環境変数内

以下のコードを使用します

    package UploadServlet;

    import Java.io.*;
    import Java.util.*;

    import javax.servlet.ServletConfig;
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;

    import org.Apache.commons.fileupload.FileItem;
    import org.Apache.commons.fileupload.FileUploadException;
    import org.Apache.commons.fileupload.disk.DiskFileItemFactory;        
    import org.Apache.commons.fileupload.servlet.ServletFileUpload;
    import org.Apache.commons.io.output.*;

    /**
     * Servlet implementation class UploadServlet
     */
    public class UploadServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
 * @see HttpServlet#HttpServlet()
 */
 private boolean isMultipart;
 private String filePath;
 private int maxFileSize = 50 * 1024;
 private int maxMemSize = 4 * 1024;
 private File file ;

public UploadServlet() {
    super();
    // TODO Auto-generated constructor stub
}

public void init(){
    // Get the file location where it would be stored.
    filePath = getServletContext().getInitParameter("file-upload"); 
 }
/**
 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
 */
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
     throw new ServletException("GET method used with " +
                getClass( ).getName( )+": POST method required.");
}

/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    // Check that we have a file upload request
      isMultipart = ServletFileUpload.isMultipartContent(request);
      response.setContentType("text/html");
      Java.io.PrintWriter out = response.getWriter( );
      if( !isMultipart ){
         out.println("<html>");
         out.println("<head>");
         out.println("<title>Servlet upload</title>");  
         out.println("</head>");
         out.println("<body>");
         out.println("<p>No file uploaded</p>"); 
         out.println("</body>");
         out.println("</html>");
         return;
      }
      DiskFileItemFactory factory = new DiskFileItemFactory();
      // maximum size that will be stored in memory
      factory.setSizeThreshold(maxMemSize);
      // Location to save data that is larger than maxMemSize.
      factory.setRepository(new File("c:\\temp"));

      // Create a new file upload handler
      ServletFileUpload upload = new ServletFileUpload(factory);
      // maximum file size to be uploaded.
      upload.setSizeMax( maxFileSize );

      try{ 
      // Parse the request to get file items.
      List fileItems = upload.parseRequest(request);

      // Process the uploaded file items
      Iterator i = fileItems.iterator();

      out.println("<html>");
      out.println("<head>");
      out.println("<title>Servlet upload</title>");  
      out.println("</head>");
      out.println("<body>");
      out.println("<h3>Watermark :</h3>");
      out.println("Select a file to upload: <br />");
      out.println("<form action=\"UploadServlet\" method=\"post\" enctype=\"multipart/form-data\">");
      out.println("<input type=\"file\" name=\"file\" size=\"50\" /><br/>");
      out.println("<input type=\"submit\" value=\"Upload File\" />");
      out.println("</form><br/>");
      while ( i.hasNext () ) 
      {
         FileItem fi = (FileItem)i.next();
         if ( !fi.isFormField () )  
         {
            // Get the uploaded file parameters
            String fieldName = fi.getFieldName();
            String fileName = fi.getName();
            //System.out.println("Filename:" + fileName);
            String contentType = fi.getContentType();
            boolean isInMemory = fi.isInMemory();
            long sizeInBytes = fi.getSize();
            // get application path
            String webAppPath = getServletContext().getRealPath("/");
            //System.out.println("Web Application Path :" + webAppPath);

            // Write the file

            file = new File( webAppPath + "ImageTest.jpeg") ;

            fi.write( file ) ;


            out.println("<br/><h3>Uploaded File :</h3><img src=\"ImageTest.jpeg\" height='300px' width='300px' />");

            String command = "";
            command = "convert.exe -draw \"gravity south fill black text 0,0 'Watermark' \" \"" + webAppPath + "ImageTest.jpeg \" \""+ webAppPath +"imageTest_result.jpg \"";
            ProcessBuilder pb = new ProcessBuilder("cmd.exe", "/c", command);
            Process p = pb.start();
            try {
                Thread.sleep(1000);
            } catch(InterruptedException ex) {
                Thread.currentThread().interrupt();
            }
             out.println("<br/><h3>Watermarked File :</h3><img src=\"imageTest_result.jpg\" height='300px' width='300px' />");

         }

      }
      out.println("</body>");
      out.println("</html>");
   }catch(Exception ex) {
       System.out.println(ex);
       out.println("<br/><font color='red'><b>"+ex.getMessage()+"</b></font><br/>");
   }
}

}