Changing Orientation of Image in Java

To change the orientation of an image in Java, you can use the AffineTransform class to rotate the image. Here’s an example of how you can rotate an image by 90 degrees:

Process:

• Load the image using ImageIO.read().
• Create an AffineTransform object to rotate the image.
• Use Graphics2D to apply the transformation to the image.
• Save or display the rotated image.

  import java.awt.*;
  import java.awt.image.BufferedImage;
  import java.io.File;
  import java.io.IOException;
  import javax.imageio.ImageIO;
  
  public class ImageRotation {
      public static void main(String[] args) throws IOException {
          
          File inputFile = new File("path_to_image.jpg");
          BufferedImage inputImage = ImageIO.read(inputFile);        
          int width = inputImage.getWidth();
          int height = inputImage.getHeight();   
       
          BufferedImage outputImage = new BufferedImage(height, width, inputImage.getType());  
              
          Graphics2D g2d = outputImage.createGraphics();
          g2d.rotate(Math.toRadians(90), width / 2, height / 2);
          g2d.drawImage(inputImage, 0, -height, null);   
          g2d.dispose();
  
          File outputFile = new File("rotated_image.jpg");
          ImageIO.write(outputImage, "jpg", outputFile);
  
          System.out.println("Image rotated and saved successfully.");
      }
  }

  Output
  

  Image rotated and saved successfully.

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  Explanation:

  To rotate an image in Java, start by loading the image with ImageIO.read(). This method loads the image as a BufferedImage. Then, create a new BufferedImage that fits the rotated image. This ensures the image remains properly displayed on the new canvas.

  After rotating the image, save it with ImageIO.write(). You can output the rotated image in various formats such as JPEG or PNG. The rotation process is flexible, allowing you to adjust the angle of rotation to any desired degree, including 90, 180, or 270 degrees.

  • Angle of Rotation: You can adjust the rotation angle using the rotate() method to rotate the image by any degree you choose, such as 90, 180, or 270 degrees.
  • Saving the Image: After applying the rotation, you can either save the rotated image as a new file or overwrite the original file based on your needs.
  • Handling Image Centering: When you rotate the image, you should account for its new dimensions. For example, rotating by 90 or 270 degrees swaps the width and height. You may need to adjust the coordinates to prevent clipping and ensure the image stays centered.
  • Maintaining Image Quality: The rotation process does not reduce the image’s quality if you use the proper transformations. For resizing or rotating, make sure to set rendering hints to prevent pixelation and maintain a high-quality result.
  • Adjusting Image Orientation in Java:Adjusting image orientation in Java involves rotating the image using Graphics2D and AffineTransform. This allows you to manipulate the angle, size, and position of the image on the canvas while maintaining its quality
    

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