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PixInsight calculates a separate, independent stretch for each channel. This effectively "neutralizes" the background by aligning the histograms of the individual colors. Why Linear Images Need "Unlinking" Initially
Perform processes like SpectrophotometricColorCalibration (SPCC) or BackgroundNeutralization . pixinsight lerar link
Upon first opening an image, use an Unlinked STF to see through the color cast and gradients. PixInsight calculates a separate
Once the image is color-calibrated, you must Link the Channels . A Linked STF will now show the "true" balanced colors you just created. If you keep it unlinked after calibration, the STF will override your calibration and show an artificial color balance. Pro Tips for Managing the Link pixinsight lerar link
Because raw data is "linear," it looks nearly black to the human eye.