Actual Step

Processing Mosaic Images
Option 2: Mosaic Processing with Mosaic Coordinates Script

updated: 2025-07-18

Purpose

Avoid time differences between ASIAIR and mount leading to errors during GoTo operations

Previous Step
  • Any Capturing process like Target and Mosaic Planning using Telescopius.com and ASIAIR

Next Step


  1. Basic PixInsight Function
  2. Image Preparation Options
    1. Image Preparation  for Stars and Deep Space Objects (DSOs)
    2. Processing Mosaic Images
    3. Processing Comet Images
    4. Adding Astrometric Data


Draft description, in revision.


see: Seamless Mosaics in PixInsight: Step-by-Step Guide to Get Stunning Results


Step 1: generate the Master Light as usual, take care all frames have a astrometric solution.

Step 2: PCC: Photometric Color Calibration (not necessary)

Step 3: Gradient correction, e.g. Graxpert (Script > Toolbox)

Step 4: Script: MosaicByCoordinates (Script > Mosaic > MosaicByCoordinates)

Settings: Projection: Stereographic, click Click on Calculate to coordinates, Interpolation: e.g.Lanzos-3
save the frames unstretched
see: PixInsight Mosaic By Coordinates for Easy Mosaic Creation - Chaotic Nebula

save all frames into a new folder

Warning: some astrometric solutions will have funny values after this step, like X/Y pixel size and Focal Length. 

Step 5: Apply script dnaLinearFit.js on all neighboring frames: dnaLinearFit (download here) and install with PixInsight Repository 
       (local folder e.g.:D:\Dokumente\Astro\Scripts\dnaLinearFit.js)

Step 6: GradientMergeMosaic (processes > All > GradientMergeMosaic

       Astrometric solution will be deleted in this step and X/Y pixel size and Focal Length values 

Step 7: Crop the image  


You can then de-linearize and quality enhance the image.

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