How can I compress images using java?

Question

From pagespeed I am getting only image link and possible optimizations in bytes & percentage like, Compressing and resizing https://example.com/…ts/xyz.jpg?036861 could save 212KiB (51% reduction). Compressing https://example.com/…xyz.png?303584508 could save 4.4KiB (21% reduction).

For an example I have image of size 300kb and for this image pagespeed is displaying 100kb & 30% of reduction.

This is only for one image but I am sure I will have lots of images for compression. so how can I compress image by passing bytes or percentage as a parameter or using anyother calculations in java (by using API or image-processing Tool) so,that I can get compressed version of image as suggested by google.

Thanks in advance.

Answer 1

You can use Java ImageIO package to do the compression for many images formats, here is an example

import java.awt.image.BufferedImage;
import java.io.*;
import java.util.Iterator;
import javax.imageio.*;
import javax.imageio.stream.*;

public class Compresssion {

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

    File input = new File("original_image.jpg");
    BufferedImage image = ImageIO.read(input);

    File compressedImageFile = new File("compressed_image.jpg");
    OutputStream os = new FileOutputStream(compressedImageFile);

    Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("jpg");
    ImageWriter writer = (ImageWriter) writers.next();

    ImageOutputStream ios = ImageIO.createImageOutputStream(os);
    writer.setOutput(ios);

    ImageWriteParam param = writer.getDefaultWriteParam();

    param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
    param.setCompressionQuality(0.05f);  // Change the quality value you prefer
    writer.write(null, new IIOImage(image, null, null), param);

    os.close();
    ios.close();
    writer.dispose();
  }
}

You can find more details about it here

Also there are some third party tools like these

• https://collicalex.github.io/JPEGOptimizer/
• https://github.com/depsypher/pngtastic

EDIT: If you want to use Google PageSpeed in your application, it is available as web server module either for Apache or Nginx, you can find how to configure it for your website here

https://developers.google.com/speed/pagespeed/module/

But if you want to integrate the PageSpeed C++ library in your application, you can find build instructions for it here.

https://developers.google.com/speed/pagespeed/psol

It also has a Java Client here

https://developers.google.com/api-client-library/java/apis/pagespeedonline/v1