Image Equalization Plugin

History: 2021/6/10: First version
Source: Equalizer.ijm
Installation: 1. Update your imagej to the newest version (help-->update) and make sure it is version 1.53e at least (help-->about).
2. Drag the attached macro onto the imagej toolbar
3. In the new window click Macros -->run macro

It takes 2 open images
finds the intensity of both
gets the mean
adds the appropriate value to each image so average intensities are the same.