The AstroImageJ paper
is now published in the Astronomical Journal with open access (i.e. free to anyone). An expanded edition
is also available on arXiv which provides a more detailed description of the AIJ and its user interface. If you use AIJ in your work, please include a reference to "Collins, Kielkopf, Stassun, and Hessman 2017, AJ, 153, 77".