PixInsight - Master Calibration Files

Master Flats Generation with FBPP

updated: 2025-10-24

Purpose

The  Fast Batch Preprocessing (FBPP) script is used to generate the  Master Flats frames.
The settings to generate Master Dark or Master Bias Frames are identical. 

Activation

Process 🡺 All Processes 🡺 Image Integration

Input

Dark and Bias calibration frames (as RAW or linear images)

Output

Master Dark and Bias frames (like masterDark_BIN-1_6246x4170_EXPOSURE-30.00s)

Previous Step

Capturing Calibration Frames using the ASIAIR

Next Step

Alignment and Integration

Resource(s)


Step

Description

Master Dark Frames

1

Open the Fast Batch Preprocessing (FBPP) script

and clear all old Bias,  Darks, Flats and Lights files


2

Click on the Flats tab and add your Flats files

  • Load your flat frames into the "Calibration" tab of the WBPP script. 
  • Load your master bias (and master dark, if not using individual darks) into the appropriate sections. 
  • Ensure that the "C" (calibrated) flats are correctly specified to be saved to an output directory. 
  • Run the script. It will automatically calibrate each flat with the master bias and integrate the calibrated flats into a single master flat. 
  • masterDark_BIN-1_6246x4170_EXPOSURE-30.00s


3

Add your Bias Master File (or individual Bias files)

4

Add your Darks Master File (or individual Darks files)

5

Global Settings

  • use these options to generate the Flats

6

Post Calibration Options

  • use these options to generate the Flats

7

Set the Output Directory

8

Run the Integration

Click on Run

9

Result

7

Move the master calibration file to the final destination folder 

8

Rename the Master file according to the Master File Naming Convention

e.g.: 

  • MasterFlat_Stack20_10.0ms_Bin1_2600MC_filter-NoFilter_gain100_20250221_-9.3C.xisf
  • MasterFlat_Stack20_EXPOSURE-30.00s_BIN-1_FUXT3FU135_FoL-135_ISO-3200_6246x4170_FILTER-UVIR67_CFA.xisf

9

Result

******************** MASTER FLAT GENERATION ********************

Group of 20 Flat frames (20 active)

SIZE  : 6246x4170

BINNING  : 1

Filter   : UVIR67

Exposure : 0.00s

Keywords : []

Mode     : calibration

Color    : CFA


Master Dark automatic match.


Master bias: F:/FotosLibrary/_Astro/_Calibrations/FUJXT3 Calibration/Bias/masterBias_BIN-1_6246x4170_FUXT3FU55_ISO3200_20251015.xisf

Master dark: none

Master flat: none


Calibration completed: 20 Flat frames calibrated.

Rejection method auto-selected: Linear Fit Clipping

Integration completed: master Flat saved at path F:/FotosLibrary/_Astro/_Calibrations/FUJXT3 Calibration/FUXT3FU135 Calibration/Flats/Filter-UVIR67/Flats135_F5.6_ISO3200/Work/master/masterFlat_BIN-1_6246x4170_FILTER-UVIR67_CFA.xisf

****************************************************************

9

Rename the Master file according to the Master File Naming Convention

e.g.: 

  • MasterFlat_Stack20_10.0ms_Bin1_2600MC_filter-NoFilter_gain100_20250221_-9.3C.xisf
  • MasterFlat_Stack20_EXPOSURE-120.00s_BIN-1_FUXT3FU135_FoL-135_ISO-3200_6246x4170_FILTER-UVIR67_CFA.xisf

10

Next Step: Alignment and Integration




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