How to read JPEG images in Java (Tutorial)

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 written 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.

and the Java code to read JPEG images with ImageIO…

File file = new File("/path/to/image.jpg");

BufferedImage image = ImageIO.read(file);

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

and the Java code to read JPEG images with JDeli…

File file = new File("/path/to/image.jpg");

BufferedImage image = JDeli.read(file);

// Read an image
BufferedImage bufferedImage = JDeli.read(dicomImageFile);

// Read an image
BufferedImage bufferedImage = JDeli.read(heicImageFile);

// Write an image
JDeli.write(bufferedImage, "heic", outputStreamOrFile);

// Read an image
BufferedImage bufferedImage = JDeli.read(jpegImageFile);

// Write an image
JDeli.write(bufferedImage, "jpeg", outputStreamOrFile);

// Read an image
BufferedImage bufferedImage = JDeli.read(jpeg2000ImageFile);

// Write an image
JDeli.write(bufferedImage, "jpx", outputStreamOrFile);

// Write an image
JDeli.write(bufferedImage, "pdf", outputStreamOrFile);

// Read an image
BufferedImage bufferedImage = JDeli.read(pngImageFile);

// Write an image
JDeli.write(bufferedImage, "png", outputStreamOrFile);

// Read an image
BufferedImage bufferedImage = JDeli.read(tiffImageFile);

// Write an image
JDeli.write(bufferedImage, "tiff", outputStreamOrFile);

// Read an image
BufferedImage bufferedImage = JDeli.read(webpImageFile);

// Write an image
JDeli.write(bufferedImage, "webp", outputStreamOrFile);