Add watermark to image

Question

I'm trying to add watermark to an image on my website. The way I want it to work is to show the watermark when the image is downloaded or shown on other websites. On my website I want to show it without the watermark. It would be awesome if the watermark is placed on the picture. Is this possible to do the above mentioned by using some picture meta-data or http headers for example? Or is it impossible to perform this and should I do it by adding a footer upon upload and hiding it?

Look for "java watermark image" - there are plenty of posts to do this. It isn't JavaEE per se but can be implemented in, for example, a servlet. It would be very easy to display the image without it on your site and with it downloaded. Of course, that assumes that the version on your site is not desirable for some reason - for example, resolution. Otherwise people will just download it directly from you without the watermark. — stdunbar, Aug 25 '16 at 15:42
Yeah, I can use google, adding watermark itself isn't my problem. I'm talking about adding watermark upon Right Click -> Save/Show Image. — Fubundzer, Aug 25 '16 at 21:45
Disable right click using Javascript and have a "save image" button. On the saved image, add the water mark. It won't stop anybody a bit determined but it will be better than nothing. — stdunbar, Aug 25 '16 at 21:57
Just remember that the user can always either capture whatever is on their screen and perhaps even capture the image without the watermark through the browser. — user1803551, Aug 28 '16 at 03:13

score 4 · Answer 1 · answered May 10 '17 at 04:28

You can reference the follow link:

Add text watermark to image

static void addTextWatermark(String text, File sourceImageFile, File destImageFile) {
    try {
        BufferedImage sourceImage = ImageIO.read(sourceImageFile);
        Graphics2D g2d = (Graphics2D) sourceImage.getGraphics();

        // initializes necessary graphic properties
        AlphaComposite alphaChannel = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.1f);
        g2d.setComposite(alphaChannel);
        g2d.setColor(Color.BLUE);
        g2d.setFont(new Font("Arial", Font.BOLD, 64));
        FontMetrics fontMetrics = g2d.getFontMetrics();
        Rectangle2D rect = fontMetrics.getStringBounds(text, g2d);

        // calculates the coordinate where the String is painted
        int centerX = (sourceImage.getWidth() - (int) rect.getWidth()) / 2;
        int centerY = sourceImage.getHeight() / 2;

        // paints the textual watermark
        g2d.drawString(text, centerX, centerY);

        ImageIO.write(sourceImage, "png", destImageFile);
        g2d.dispose();

        System.out.println("The tex watermark is added to the image.");

    } catch (IOException ex) {
        System.err.println(ex);
    }
}

Add image watermark to image

static void addImageWatermark(File watermarkImageFile, File sourceImageFile, File destImageFile) {
    try {
        BufferedImage sourceImage = ImageIO.read(sourceImageFile);
        BufferedImage watermarkImage = ImageIO.read(watermarkImageFile);

        // initializes necessary graphic properties
        Graphics2D g2d = (Graphics2D) sourceImage.getGraphics();
        AlphaComposite alphaChannel = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.3f);
        g2d.setComposite(alphaChannel);

        // calculates the coordinate where the image is painted
        int topLeftX = (sourceImage.getWidth() - watermarkImage.getWidth()) / 2;
        int topLeftY = (sourceImage.getHeight() - watermarkImage.getHeight()) / 2;

        // paints the image watermark
        g2d.drawImage(watermarkImage, topLeftX, topLeftY, null);

        ImageIO.write(sourceImage, "png", destImageFile);
        g2d.dispose();

        System.out.println("The image watermark is added to the image.");

    } catch (IOException ex) {
        System.err.println(ex);
    }
}

http://www.codejava.net/java-se/graphics/adding-a-watermark-over-an-image-programmatically-using-java

Add watermark to image

1 Answers1