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, a critical phase in astrophotography processing where data remains mathematically proportional to the light captured by the sensor. Understanding Linear vs. Non-Linear Data
In PixInsight, your "story" or workflow typically follows two main chapters: Linear Data
: This is the raw state after stacking. The image looks almost black because the brightness values are very low, but the mathematical relationships between pixels are preserved. Non-Linear Data pixinsight lerar link
: This is the state after you "stretch" the image (using tools like HistogramTransformation or Generalized Hyperbolic Stretch) to make the details visible to the human eye. Essential "Linear" Workflow Links & Resources
If you are looking for guides on how to handle data during this phase, these resources are highly regarded: Official Tutorials PixInsight Resources
page provides links to official and unofficial tutorials covering linear processes like background extraction and color calibration. Beginner's Workflow (2025 Edition) : A streamlined Easy Beginner's Workflow that walks through the interface and initial results. Linear Sharpening : For advanced detail, this Image Sharpening Tutorial Let me know, and I’ll give you a
explains how to enhance crispness while the data is still in its linear state. Complete Processing Guide : A full walkthrough from raw stacked master to finished image
, detailing every decision in the linear and non-linear phases. Quick Shortcuts for Linear Processing
While working in the linear phase, use these shortcuts to see your work without permanently altering the data: Screen Transfer Function (STF) LinearNoiseReduction:
to apply an "Auto Stretch" that lets you see the image while it remains technically linear. to navigate through your processing steps. pixinsight.com.ar specific process
(like Color Calibration or Deconvolution) to perform while your data is still linear? PixInsight - Easy Beginner's Workflow | 2025 Edition
If you are trying to link two images that are not perfectly registered (aligned), the statistics will be wrong.
For Narrowband users who want a synthetic "Lerar Link" to RGB stars, this script (by J. Conejero) is the gold standard. It preserves star color while mapping Ha to Red.