Mark Stephens Mark has been working with Java and PDF since 1999 and is a big NetBeans fan. He enjoys speaking at conferences. He has an MA in Medieval History and a passion for reading.

How to write JPEG2000 Images in Java

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JPEG2000 icon

In this article I will show you how to write JPEG2000 images in Java.

ImageIO is able to write images as JPEG2000 files (jp2 format only), but it offers very little control over the process or output. We added JPEG2000 support to our JDeli Image library so we could get quality JPEG2000 output. In this article we show you how to use either JDeli or ImageIO and cover the benefits of JDeli.

What is JPEG2000?

JPEG2000 iconJPEG2000 was developed 1997-2000 as a replacement for original JPEG file format. It is not backwards compatible. The aim was to produce smaller files than possible with JPEG format. It also uses lossy or lossless compression for digital images.

The file name extensions for JPEG2000 files are: .jp2 and .jpx.

JPEG versus JPEG2000

Here are the reasons you might want to use JPEG or JPEG2000 image file format.
JPEG

  • Optimum file size for small images
  • Most widely supported in browsers
  • Good color range
  • Good for color photos but not that great for plain text
  • Low compression ratio for lossy compression

JPEG 2000

  • Better on large images (for smaller images jpeg is still smaller)
  • No universal browser support
  • Encoding is CPU intensive and encoding is not as fast and easy as encoding in jpeg
  • File format is less likely to be affected by ‘bit errors’ and other file system errors due to its more efficient coding structure

How to write an image as a JPEG2000 file in ImageIO

Step 1 ImageIO will need the JAI_ImageIO plugin installed.
Step 2 Create a File (or OutputStream) object for the JPEG2000 output.

File file = new File("/path/to/outputFile.jp2"));

Step 3 Pass image, jpg type and File (or OutputStream) object into write method

ImageIO.write(bufferedImage, "jpeg 2000", file);

How to write an image as a JPEG2000 file with JDeli

Step 1 Add JDeli to your class or module path. (download link to the trial jar).
Step 2 Create a File (or OutputStream) object

File file = new File("/path/to/outputFile.jp2"));

Step 3 Pass image, JPEG2000 type and File (or OutputStream) object into write method

JDeli.write(bufferedImage, "jp2", file);

In JDeli you can also use a typesafe version

JDeli.write(bufferedImage, OutputFormat.JPEG2000, file);

or pass in a Jpeg2000EncoderOptions object for more control over JPEG2000 image output such as level of Compression.

Jpeg2000EncoderOptions options = new Jpeg2000EncoderOptions();
JDeli.write(bufferedImage, options, file);

Why use JDeli to write JPEG2000 images?

JDeli offers a range of advantages over ImageIO and alternatives, including:

  • prevents heap related JVM crashes
  • Supports both jpx and jp2 subtype
  • supports non-RGB colorspaces
  • produces smaller output files
  • faster write performance
  • supports threading

Learn more about JDeli, or download to try it yourself.



Mark Stephens Mark has been working with Java and PDF since 1999 and is a big NetBeans fan. He enjoys speaking at conferences. He has an MA in Medieval History and a passion for reading.

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