Image Processing (Read and Write) in Java

java.awt.image.BufferedImage

To perform image read and write, the BufferedImage class can be used as holder class. This class is used to store an image in RAM.

javax.imageio.ImageIO

To perform the image read write operation we will import the ImageIO class. This class has static methods to read and write an image.

package amazon.dp;

import java.io.File;

import java.io.IOException;

import java.awt.image.BufferedImage;

import javax.imageio.ImageIO;

public class ImageReader {

     /**

      * readImage - Method to read an IMAGE

      * @param width

      * @param height

      */

     private static BufferedImage readImage(int width, int height) {

           /** Create an object of BufferedImage with parameter width, height and

            * image int type.TYPE_INT_ARGB represents the Alpha, Red, Green and Blue

            * component of the image pixel using 8 bit integer value. */

           //For storing image in RAM

           BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);

           try {

                File input_file = new File("D:\\Python\\InImage.jpg"); //image file path

                // Reading input file

                image = ImageIO.read(input_file);

                System.out.println("Reading complete.");

           } catch(IOException e) {

                System.out.println("Error: "+e);

           }

           return image;

     }

     /**

      * writeImage - Method to write an IMAGE

      * @param BufferedImage image

      */

     private static void writeImage(BufferedImage image) {

           try {

                // Output file path

                File output_file = new File("D:\\Python\\OuImage.jpg");

                // Writing to file taking type and path as

                ImageIO.write(image, "jpg", output_file);

                System.out.println("Writing complete.");

           } catch(IOException e) {

                System.out.println("Error: "+e);

           }

     }

     public static void main(String args[]) throws IOException {

           int width = 963;    //width of the image

           int height = 640;   //height of the image

           // READ Image

           BufferedImage image = readImage(width,height);

           // WRITE Image

           writeImage(image);

     }

}