1 stack of 44 images, Canon 800D at ISO 800, Canon 50mm f1.8 at f2.8, 1m exposures, tracked with Omegon minitrack lx2. a couple dozen 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 = 10)
* Blink to clean worst frames
* weighing:
15*(1-(FWHM-FWHMMin)/(FWHMMax-FWHMMin))
+ 10*(1-(Eccentricity-EccentricityMin)/(EccentricityMax-EccentricityMin))
+ 30*(SNRWeight-SNRWeightMin)/(SNRWeightMax-SNRWeightMin)
+ 25*(1-(Median-MedianMin)/(MedianMax-MedianMin))
+ 20
* align on 3157
***** Linear processing
* linearfit R and B channels to G, channel combine
* crop
* DBE tolerance 3
* Denoised - EZDenoise, TGV decrease exponent by -1
* background neutralization on upper right corner, limit 0.5
* color calibration, same background
* SNCR
***** Nonlinear processing
*** Initial stretch
* luma stretch: ezsoft stretch, zero in white point
* chroma stretch Arcsinh 0.0009 black 1000 color
* LRGB combine
*** EZStarReduction
*** Star mask creation with ezDecon, boost, binarize, convolve
*** Multilayer processing
http://www.stelleelettroniche.it/en/2014/09/astrophoto/m42-ngc1975-multilayer-processing-first-part/** First iteration (detail)
* extract first 5 layers of mlt, diff
* mask diff with original image's R channel stretched shadows 0.1 mids 0.15
* s-curve in luminance, boost saturation
** Second iteration (nebulas)
* extract first 6 layers of mlt, diff
* mask diff with original image's R channel stretched shadows 0.1 mids 0.15, blurred with 4 mlt layers
* s-curve in luminance, boost saturation
* pixelmath back together
*** Finishers
* with star mask on protecting non-stars, increase saturation
* MMT sharpen - 6 layers, biases 0.05 0.05 0.025 0.025 0.012 0.005
* Resample 2
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