Sylwia Dorota Kedzia Sylwia is a Java developer. She is very passionate about programming and all things Polish.

How to Read JPEG2000 in Java

1 min read

In this article, I will talk you through on how to read JPEG2000 images into a BufferedImage in Java.

ImageIO provides support for JPEG2000 using JJ2000 (originally written around 2000). It produces poor results with a lot of our sample images (black spots on white images) and is not complete. So we felt it was time to add a modern implementation to JDeli using Java8.

What is JPEG2000?

JPEG2000 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.

JPEG2000 is an image decoding standard that was originally created as an update of the well known JPEG Format which was introduced in the year 2000 by the Joint Photographic Experts Group committee. It uses lossy compression image mode that is based on discrete wavelet transformation.

JPEG2000 compared to JPEG offers:

  1. A better higher compression performance,
  2. Outputs of multiple resolutions,
  3. The option for both lossless and lossy compression,
  4. Improved noise resilience,
  5. Flexibility in file formats,
  6. Bit depth support,
  7. advance support for transparency and alpha planes.

The filename extensions commonly associated with JPEG 2000 are: .jp2, .j2k, and .jpx.

How to read a JPEG2000 image in Java with ImageIO

Step 1 Create a File, InputStream or URL pointing to the raw JPEG2000 image.
Step 2 ImageIO will now be able to read a JPEG2000 file into a BufferedImage. This syntax is like so:

BufferedImage image = ImageIO.read(jpg2000FileOrInputStreamOrURL)

How to read a JPEG2000 image in Java with JDeli

Step 1 Add JDeli to your class or module path. (download the trial jar).
Step 2 Create a File, InputStream pointing to the raw JPEG2000 image. You can also use a byte[] containing the image data.
Step 3 Read the JPEG2000 image into a BufferedImage

BufferedImage image = JDeli.read(jpeg2000File);

Why use JDeli to read JPEG2000?

JDeli offers a modern, supported implementation with a range of advantages over ImageIO and alternatives, including:

  • prevents heap related JVM crashes
  • implements unsupported image sub-formats
  • reduce output file size
  • improve read performance
  • supports threading
  • superior image scaling algorithms

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

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Sylwia Dorota Kedzia Sylwia is a Java developer. She is very passionate about programming and all things Polish.

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