Image Rotation In Java

In this article I will show you how to rotate images in Java.

The simplest way to rotate an image in Java is to use the AffineTransformOp class. You can load an image into Java as a BufferedImage and then apply the rotate operation to generate a new BufferedImage. You can use Java’s ImageIO or a third-party image library such as JDeli to load and save the image. We have used JDeli in our example below because it works with all JPEG files and the widest range of filetypes.

Step:1 Load an image file into Java as a BufferedImage

You can load an image file using Java ImageIO (which is built into Java )

BufferedImage image = ImageIO.read(new File("C:\\path\\to\\image.jpg"));

You can also load image files using other open source or commercial libraries. Here is an example using JDeli Image library.

BufferedImage image = JDeli.read(new File("C:\\path\\to\\image.jpg"));

Step:2 Rotate the BufferedImage in Java

This code will rotate the image by 90 degrees. 


final double rads = Math.toRadians(90);
final double sin = Math.abs(Math.sin(rads));
final double cos = Math.abs(Math.cos(rads));
final int w = (int) Math.floor(image.getWidth() * cos + image.getHeight() * sin);
final int h = (int) Math.floor(image.getHeight() * cos + image.getWidth() * sin);
final BufferedImage rotatedImage = new BufferedImage(w, h, image.getType());
final AffineTransform at = new AffineTransform();
at.translate(w / 2, h / 2);
at.rotate(rads,0, 0);
at.translate(-image.getWidth() / 2, -image.getHeight() / 2);
final AffineTransformOp rotateOp = new AffineTransformOp(at, AffineTransformOp.TYPE_BILINEAR);
rotateOp.filter(image,rotatedImage);

You can rotate an image using JDeli library in fewer lines of code

final Rotate rotate = new Rotate(90);
BufferedImage rotatedImage = rotate.apply(image);

Step:3 Resave the BufferedImage to a new File

You can save an image file using Java ImageIO (which is built into Java )

ImageIO.write(rotatedImage, "JPG", new File("C:\\path\\to\\rotatedImage.jpg"));

You can also save image files using other open-source or commercial libraries. Here is an example using JDeli Image library.

JDeli.write(rotatedImage, "JPG", new File("C:\\path\\to\\rotatedImage.jpg")); 

And that is all you need to do!!!