How to read JPEG images in Java

In this article, I will show you how to read JPEG images in Java using ImageIO and JDeli. We also have a related article covering how to write JPG files in Java.

ImageIO is able to handle most JPEG files but does not fully implement the spec. If you want more complete JPEG support, JDeli has been built up to provide this.

How to read a JPEG image in Java with ImageIO

1. Create a File, InputStream or URL Object pointing to the JPEG.
2. Pass the value into ImageIO which will convert to a BufferedImage.

   BufferedImage image = ImageIO.read(jpegFileOrInputStreamOrURL)

How to read a JPEG image in Java with JDeli

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

   BufferedImage image = JDeli.read(jpegFileOrInputStreamOrByte);

Download your JDeli guide:

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Start reading and writing images with one line of code

Read: BufferedImage image = JDeli.read(streamOrFile);

Write: JDeli.write(myBufferedImage, OutputFormat.HEIC, outputStreamOrFile)

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