(1) ImageJ Tutorial How to fix an image that is too bright using log transformation: https://youtu.be/zYNQnndXr9o (2) ImageJ Tutorial: How to import video and convert ...
If you want to learn how to use ImageJ and/or ImageJ2 (as opposed to write programs with ImageJ2), then visit ImageJ Tutorials. This project contains example code for working with ImageJ2 and SciJava.