Home Java Example Java Swing Graphics2D Use of Image I/O library

Use of Image I/O library
Posted on: October 14, 2008 at 12:00 AM

The ImageIO class provides the method to read and write image. We are providing you an example which copies the specified input file into the output file.

Use of Image I/O library

This section illustrates you how to use Image I/O library.

The ImageIO class provides the method to read and write image. We are providing you an example which copies the specified input file into the output file. A file image4.jpg is defined as input file which is read by the method read() of ImageIO class and returns a buffered image after decoding the file.

A matrix is defined in the variable data of float type. This matrix is defined by the class Kernel to describe how a pixel affect its position in the output image of a filtering operation. The class ConvolveOp provides a correlation from the source to the destination. The method filter(input, output) of class ConvolveOp performs a translation on BufferedImages.

The method write(output, "GIF", outputFile) writes into the output file logo.gif.

Here is the code of CopyImage.java


import java.io.*;

import java.awt.image.*;

import javax.imageio.ImageIO;



public class CopyImage {

  private static final float[] data = { 0.0f, -1.0f, 0.0f, -1.0f, 5.0f,

  -1.0f, 0.0f, -1.0f, 0.0f };

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

  File fileIn = new File("image4.jpg");

  BufferedImage bufferedImage1 = ImageIO.read(fileIn);

  Kernel kernel = new Kernel(3, 3, data);

  ConvolveOp convolveOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP,

  null);

  int width = bufferedImage1.getWidth();

  int height = bufferedImage1.getHeight();

  BufferedImage bufferedImage2 = new BufferedImage(width, height,

  BufferedImage.TYPE_INT_ARGB);

  convolveOp.filter(bufferedImage1, bufferedImage2);

  File fileOut = new File("logo.gif");

  ImageIO.write(bufferedImage2, "GIF", fileOut);

  }

}

When you run the above program, the input file is copied into the output file specified.

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