The LEARN link works by creating a dynamic connection between a ROI and a script or process. When you create a LEARN link, PixInsight generates a small, rectangular region around the ROI, which is used to extract data. This data is then analyzed and used to generate a script or process that can be applied to the entire image or specific areas of interest.
Shortcut: On Windows/Linux, you can hold while clicking the Nuclear icon to perform an unlinked auto-stretch directly. Deep Dive 2: Mastering the LinearFit Process
When you open the STF process window ( Process > All Processes > ScreenTransferFunction ), you will notice a small icon resembling a in the top-left corner. This is the Track Buttons / Link Channels toggle.
Introduced in PixInsight 1.8.8, Local Normalization replaces the old “Linear Fit” clipping algorithm. LN corrects large-scale and small-scale background differences between sub-exposures caused by: pixinsight lerar link
Before we dive into Local Normalization, you must understand basic linking. WBPP automates this, but errors happen.
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Here are some tips and tricks to help you get the most out of LEARN link: The LEARN link works by creating a dynamic
Narrowband imaging (Ha, OIII, SII) presents unique challenges for linking and Local Normalization.
After performing background neutralization and color calibration, you should switch back to Linear Fit: A related tool, the Linear Fit
Apply or standard ColorCalibration to your image. This uses stellar databases to calculate the exact, correct white balance for your stars and deep-sky targets. 4. Evaluation (Linked) Shortcut: On Windows/Linux, you can hold while clicking
Forces backgrounds to a neutral gray by scaling all channels separately. 🛠 How to Use the Linear Link Feature in PixInsight Does unlinked STF spoil SPCC | PixInsight Forum
PixInsight evaluates each individual color channel independently. It calculates three unique histogram transformations, stretching the Red, Green, and Blue channels separately to match their median background levels.