How to Cut an Image into the Shape of Text Using Java?

Cutting out an Image in the Shape of Text

Problem: Given two images, one containing text and the other containing an image, create a cutout of the image in the shape of the text.

Requirements:

• Text must be black with a transparent background.
• Output image should also have a transparent background.
• Both input images must have the same size.

Solution:

To achieve this effect, we can use the Java AWT library. Here's a code snippet that demonstrates how:

import java.awt.*;
import java.awt.font.*;
import java.awt.image.BufferedImage;
import java.awt.geom.Rectangle2D;
import javax.imageio.ImageIO;
import java.net.URL;
import java.io.File;

class PictureText {

    public static void main(String[] args) throws Exception {
        URL imageUrl = new URL("https://i.sstatic.net/Nqf3H.jpg");
        BufferedImage originalImage = ImageIO.read(imageUrl);
        BufferedImage textImage = new BufferedImage(
            originalImage.getWidth(),
            originalImage.getHeight(),
            BufferedImage.TYPE_INT_ARGB);
        Graphics2D g = textImage.createGraphics();
        FontRenderContext frc = g.getFontRenderContext();
        Font font = new Font(Font.SANS_SERIF, Font.BOLD, 250);
        GlyphVector gv = font.createGlyphVector(frc, "Cat");
        Rectangle2D box = gv.getVisualBounds();
        int xOffset = 25 + (int)-box.getX();
        int yOffset = 80 + (int)-box.getY();
        Shape shape = gv.getOutline(xOffset, yOffset);
        g.setClip(shape);
        g.drawImage(originalImage, 0, 0, null);
        g.setClip(null);
        g.setStroke(new BasicStroke(2f));
        g.setColor(Color.BLACK);
        g.setRenderingHint(
            RenderingHints.KEY_ANTIALIASING,
            RenderingHints.VALUE_ANTIALIAS_ON);
        g.draw(shape);

        g.dispose();

        File outputFile = new File("cat-text.png");
        ImageIO.write(textImage, "png", outputFile);
        Desktop.getDesktop().open(outputFile);
    }
}

In this code:

1. We load both images into BufferedImage objects (originalImage and textImage).
2. We create a graphics context for textImage to draw on it.
3. We create a glyph vector from the text provided and determine its visual bounds.
4. We set the graphics context's clip shape to the outline of the glyph vector, effectively masking out the rest of the image.
5. We draw the original image onto the textImage, clipped to the shape of the text.
6. We remove the clip mask and draw the outline of the text in black.
7. Finally, we write the textImage to a file and open it in the default image viewer.

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