Java program to create and apply border effect to image.

Voronoi diagram generated using JavaFX with 25 random placed points using Euclidean distance (distance order of 2).
Image without border.
Image with border
Image with border.

import javax.imageio.ImageIO;
import java.awt.*;

// 2018 TheFlyingKeyboard and released under MIT License 
public class Main {
    public static void main(String[] args) {
        BorderEffect borderEffect = new BorderEffect(10, new Color(0, 0, 0));

        try {
            ImageIO.write(borderEffect.apply( File("image.png"))),
                    "png", new File("Image with border.png"));
        } catch (Exception e) {

import java.awt.*;
import java.awt.image.BufferedImage;

// 2018 TheFlyingKeyboard and released under MIT License
public class BorderEffect {
    private final int borderSize;
    private final Color color;

    public BorderEffect(int borderSize, Color color) {
        this.borderSize = borderSize;
        this.color = color;

    public BufferedImage apply(BufferedImage bufferedImage) {
        Graphics2D graphics2D = bufferedImage.createGraphics();

        graphics2D.fillRect(0, 0, bufferedImage.getWidth(), borderSize);
        graphics2D.fillRect(0, bufferedImage.getHeight() - borderSize, bufferedImage.getWidth(), borderSize);

        graphics2D.fillRect(0, 0, borderSize, bufferedImage.getHeight());
        graphics2D.fillRect(bufferedImage.getWidth() - borderSize, 0, borderSize, bufferedImage.getHeight());

        return bufferedImage;


Java Image Border Effect
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