PixInsight calculates a custom stretch for each channel based on its individual histogram. This is essential for raw images that have a heavy color cast (often green from a Bayer matrix or red from light pollution). Unlinking the channels effectively "neutralizes" the background on your screen so you can actually see the nebula or galaxy hidden behind the cast. Workflow Significance Initial Inspection: For a raw RGB image, you will almost always start with
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After you have performed color calibration (like SPCC). It preserves the color balance you've achieved. PixInsight calculates a custom stretch for each channel
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 Workflow Significance Initial Inspection: For a raw RGB