Non-Linear Images (In Depth)

This video explains the idea of non-linear relationships in data and how that plays a role in image processing in PixInsight. This concept is often glossed over in tutorial materials (and is virtually non-existent in manuals). Here it is given the treatment it deserves. 

 

The grayscale calibration chart can be downloaded by clicking the image below.  It was created by motivated member Gary Palmer. You can use it to follow along if you wish!