Create an image with rounded corners

Here is how you can reshape/clip an image into the shape you like. Sometimes, we want to shape an image into a rounded rectangle. We generally use image editing software like photoshop to do this. Did you know that we can do it ourselves in Java? That too in a simpler way than you think of? Let us see how to do this.

RoundAnImage.java

import javax.imageio.*;
import java.awt.image.*;
import java.io.*;
import java.awt.*;
import java.awt.geom.*;
class RoundAnImage {
    public static void main(String args[]) throws Exception {
        // Get the BufferedImage object for the image file
        BufferedImage originalImg = ImageIO.read(new File(args[0]));

        // Get the width,height of the image
        int width = originalImg.getWidth();
        int height = originalImg.getHeight();

        // Create a new BufferedImage object with the width,height
        // equal to that of the image file
        BufferedImage bim = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);

        // Create a Graphics2D object by using
        // createGraphics() method. This object is 
        // used to perform the operation!
        Graphics2D g2 = bim.createGraphics();

        // You can also use rendering hints
        // to smooth the edges or the rounded rectangle
        RenderingHints qualityHints = new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        qualityHints.put(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
        g2.setRenderingHints(qualityHints);

        // This method does it all!. You can clip the
        // image into the shape you wish, play it as you like!
        g2.setClip(new RoundRectangle2D.Double(0, 0, width, height, width / 4, height / 4));

        // Now, draw the image. The image is now
        // in the 'clipped' shape, the shape in the setClip()
        g2.drawImage(originalImg, 0, 0, null);

        // Dispose it, we no longer need it.
        g2.dispose();

        // Write to a new image file
        ImageIO.write(bim, "PNG", new File(args[0] + "-rounded.png"));
    }
}