New Tutorial for DynamicBackgroundExtraction

[kayronjm]

Read here: http://www.lightvortexastronomy.com/tutorial-reducing-light-pollution-effects-removing-gradients-and-artificial-flattening.html

This new tutorial covers the fundamentals and use of PixInsight's powerful DynamicBackgroundExtraction process, with three main applications detailed:
 
- Reducing light pollution effects on images
- Removing background gradients from various sources
- Artificially flattening images that have not been through proper flat calibration