Go to the top menu and select Resources > Updates > Manage Repositories .
Open Process > PixelMath .
, detailing every decision in the linear and non-linear phases. Quick Shortcuts for Linear Processing pixinsight lerar link
This is a core PixInsight process used to match the brightness levels (histograms) of different color channels. Go to the top menu and select Resources
Run the Statistics process on your images after applying the link. pixinsight lerar link