A detailed technical paper on ImageJ2 has been published in BMC Bioinformatics:
Rueden, C. T.; Schindelin, J. & Hiner, M. C. et al. (2017), “ImageJ2: ImageJ for the next generation of scientific image data”, BMC Bioinformatics 18:529, https://doi.org/10.1186/s12859-017-1934-z.
Please cite it if you use ImageJ2 in your work! Thank you!