1 stack of 95 30s images, Canon 800D at ISO 800, Canon 400mm f5.6 lens at f6.3, iOptron Skyguider Pro tracker. 100 darks, 120 biases. Processed in PixInsight as below
***** Integration
lightvortexastronomy tutorial (
https://www.lightvortexastronomy.com/tutorial-pre-processing-calibrating-and-stacking-images-in-pixinsight.html)
* CC defect list + master dark (sigma = 8)
15*(1-(FWHM-FWHMMin)/(FWHMMax-FWHMMin))
+ 35*(1-(Eccentricity-EccentricityMin)/(EccentricityMax-EccentricityMin))
+ 20*(SNRWeight-SNRWeightMin)/(SNRWeightMax-SNRWeightMin)
+ 30
img 6774 ref
* generalized ESD integration
* drizzle integration, gaussian kernel
*****Linear processing
*** Initial
* Crop
* DBE tolerance 3
*** Color calibration
* Color calibration using background reference a portion below Alnitak
* Photometric CC for finetune
*** Denoise
* EzDenoise default (Jon Rista's method)
*** CC 2
* SNCR green 1
***** Nonlinear processing
*** Starmask creation for later processing
* Extract luminance
* EZSoftStretch median 0.2 expand lower 0.05
* range mask 0.95-1, blur with 4 layers of a trous - range_mask
* stretch duplicate shadow 0.3 mids 0.25, blur 2 layers of a trous - stretch_mask
*** Initial stretch:
* arcsinh stretch factor 174 black point 0.002
*** Magenta star fix
* extract color channels
* with range_mask from luminance on, max(twins_G, (twins_B + twins_R)/ 2) on the green channel
*** small fixes:
* denoise ACDNR on chroma only, lightness mask, SD 4 6 iterations
*** Mask stretch
* with stretch_mask on, histo stretch mids 0.4, curves RGB/K s-curve and slight sat boost
***Finishers
* EZ Star reduction, Adam Block method
* MMT sharpen, 6 layers biases 0.05 0.05 0.25 0.025 0.12 0.005
* with stretch mask on, saturation boost
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