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(.fits) Flexible Image Transport System (FITS) is an open standard defining a digital file format useful for storage, transmission and processing of scientific and other images. FITS is the most commonly used digital file format in astronomy.

Manish Biswas
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    [A quick google for Java Fits](https://www.google.com.au/search?client=safari&rls=en&q=java+fits&ie=UTF-8&oe=UTF-8&gfe_rd=cr&dcr=0&ei=ixdQWumYDcPN8gfo7JmIAg) brings up some interesting possible solutions - what you're looking for is any library which can return a `java.awt.Image` or equivalent - You might find that you need to convert the titles of the FITS image into a `BufferedImage` yourself – MadProgrammer Jan 06 '18 at 00:27

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From the description of the javax.imageio package.

All implementations of javax.imageio provide the following standard image format plug-ins:

  • JPEG
  • PNG
  • BMP
  • WBMP
  • GIF

Although FITS is not included, Java imaging uses a Service Provider Interface to allow adding support for other image formats. To do that, find or write a class that can understand the CODEC, then make it available to the Java imaging API via the SPI.

See Also

Writing Image I/O Plug-ins.

Andrew Thompson
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You can find a good library and documentation here: https://fits.gsfc.nasa.gov/ here you can find java specific libraries: https://fits.gsfc.nasa.gov/fits_libraries.html

navy1978
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From list of libraries for handling FITS you can choose for example eat.fits.

Then you can get:

RandomAccessFile file = new RandomAccessFile(path, "r");
RandomAccessFitsFile fitFile = new RandomAccessFitsFile(file);
FitsHDU hdu = fitFile.getHDU(0); //here may be other layer. but for image is standard first
FitsImageData imgData = (FitsImageData) hdu.getData();

FitsImageViewer image = new FitsImageViewer(imgData );

Where FitsImageViewer extends JPanel, so you can add it to JFrame and display yout FITS image.

Miloš Uriga
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