Start ImageJ on this server with two Saturn test images . Download ImageJ for your own computer . ... Use Aladin for access to astronomical databases . 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. ...