Pixinsight Lerar Link (2026 Release)

I have interpreted your request as "PixInsight LRGB Combination" (using the Luminance, Red, Green, and Blue channels). "Lerar" appears to be a typo for "LRGB," which is the most common workflow topic associated with that letter sequence in astrophotography processing.

Here is a blog post draft tailored for astrophotography enthusiasts.

The LinearFit process (found in the IntensityTransformations category) is the closest native tool to what you described. It computes a linear transformation (y = a*x + b) that scales the target image to match the reference. pixinsight lerar link

Narrowband imaging (Ha, OIII, SII) presents unique challenges for linking and Local Normalization.

Since you are searching for "Lerar Link," you likely want a one-click solution. Here are the best scripts to automate linear matching: I have interpreted your request as "PixInsight LRGB

Run the Statistics process on your images after applying the link.

Cause: You enabled Local Normalization but WBPP found no reference frame. This happens if you used “Automatic” but all your subs are poor quality. pixinsight lerar link

Fix: Manually create a reference. Stack your best 10-20 subs using the ImageIntegration process (use Average, no rejection). Save this as “reference_master.xisf.” Then, in WBPP, manually link to this file under “Local Normalization Reference.”

Do not ignore this tool. Inside Process > LRGBCombination, there is a checkbox called "Channels equalization" . This applies an internal linear link using the Luminance as the reference. It is the easiest way to create a link.

Use HistogramTransformation to set the black point and stretch the highlights. Since the L channel dictates brightness, stretch carefully to avoid clipping the faint nebulosity.