PixInsight applies the same mathematical stretch to all three color channels (Red, Green, and Blue) based on the image's overall statistics.
Raw astronomical data often has a heavy color bias, frequently appearing green due to the Bayer pattern of color cameras or atmospheric conditions. pixinsight lerar link
When you use an Unlinked STF (Ctrl + Click the "Radioactive" icon), PixInsight stretches the channels separately, which removes that heavy green or red cast and lets you see the actual nebula or galaxy detail. The Workflow: When to Toggle the Link PixInsight applies the same mathematical stretch to all