This is the user forum for AstroImageJ. Bug reports, help requests, comments, and feature requests should be posted here. AstroImageJ is open source software and is distributed under the terms of the GNU General Public License. AstroImageJ is a Java image processing program based on ImageJ from the NIH. It runs 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. The ImageJ user forum at http://imagej.1557.n6.nabble.com/ should be consulted for base ImageJ issues. If you use AstroImageJ in your work, please reference the AstroImageJ Astronomical Journal open access paper Collins, Kielkopf, Stassun, and Hessman 2017, AJ, 153, 77 (and the Astrophysics Source Code Library entry ascl:1309.001 (http://ascl.net/1309.001) (Bibcode: 2013ascl.soft09001C). An expanded edition of the paper is available that provides more detailed descriptions of the AIJ user interface. AstroImageJ is open source software and is distributed under the terms of the GNU General Public License.