It is worth distinguishing "Link" from "LinearFit." While linking applies the same stretch curve, the process actually calculates the mean and standard deviation of the channels and scales them mathematically to match. Using LinearFit before a linked stretch is an advanced technique to remove atmospheric extinction (where the atmosphere absorbs more blue light than red). In this workflow, you LinearFit the channels (still in the linear state) to equalize their background noise, then you apply the "Linear Link" (linked stretch) to reveal the object. This combination is often the secret to the "Hubble-like" natural colors seen in top-tier amateur work.

STF calculates an independent "Auto Stretch" for each channel. This "unlinks" them to neutralize the background, allowing you to see the nebula or galaxy hidden behind a heavy color bias before you have even performed color calibration. 2. The LinearFit Process: Physical Linking

PIXINSIGHT - AS EASY AS 1-2-3: A three-part series aimed at beginners, focusing on getting a great result through easy methods. Recommended Workflow for Beginners (2026)