ImageJ is a public domain Java image processing program inspired by NIH Image for the Macintosh. It runs, either as an online applet or as a downloadable application, on any computer with a Java 1.1 or later virtual machine. Downloadable distributions are available for Windows, Mac OS, Mac OS X and Linux. It is used in the Dendrochronology Lab at I.S.Cu.M. (Istituto per la Storia della Cultura Materiale) here in Genoa.