ImageJ is a Java-based image processing program developed at the National Institute of Health for medical imaging. It works well for astronomy too, and it is available as an applet on our server. For most astronomical uses, you will have to download the images you want to work with to your computer and then load them in the applet. We have ImageJ plug-ins, modules, and scripts specifically for astronomical photometry in available in AstroImageJ too.
You must have a Java-enabled browser to run ImageJ on the Web.
For Firefox, use these settings to allow Java:
If you accept the certificate you will be able to view images that are stored on your computer. Otherwise, you may view only images that are provided by this server.
You may need to install the Java Runtime Environment for your computer if it is not already installed. If you are unsure, try SUN's Java test website: