Dear OOF Users -- A new version of OOF2, 2.4.0, is now available on the OOF2 website: https://www.ctcms.nist.gov/oof/oof2 OOF2 2.4.0 includes a lot of changes, which are summarized at https://www.ctcms.nist.gov/oof/oof2/changes.html More details are listed in SRC/changelog.txt in the source file distribution. A major change is that OOF2 now uses numpy, scikit-image, and matplotlib instead of ImageMagick for image operations. This makes it easier to add new image tools. The new version of OOF2 requires a new version of OOFCanvas, 1.2.0, which is available at https://www.ctcms.nist.gov/oof/oofcanvas Macintosh users who have MacPorts installed can install OOF2 and OOFCanvas simply by typing sudo port install oof2 in a terminal window. Other users should consult the installation instructions on the web pages. Both OOF2 and OOFCanvas now require Python 3.10 or later, and require a C++17 compatible compiler. Please let us know if you encounter any problems. Report bugs to oof_bugs@nist.gov and send other comments to oof_manager@nist.gov. We especially like to hear about how you're using OOF2 and OOF3D now, and how you'd like to use them in the future. Sincerely, The OOF developers Steve Langer Andrew Reid Gunay Dogan