I’ll like point out an software that I use in the dendrochronology’s laboratory of I.S.Cu.M.. The measure of the rings that we make on the photograph of some wood are create whith this software.
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.
For more information, you can see at URL: http://rsb.info.nih.gov/ij/