Makarian's Chain in LRGB (Brent Newton)

Makarian's Chain in LRGB

Link: https://www.astronewton.com/virgo-2020

Catching up on more 2020 data while I wait for my new Moonlite focuser to arrive:

Housekeeping:
- BPP for Flats, Darks calibration
- Cosmic Correction, Subframe Selector, Local Normalization
- Star Align, Image Integration
- Batch Crop, Batch DBE
- RGB combine after Linear Fit R, B to G

L Processing:
- Deconvolution
- Rista method TGVD, MMT
- Masked Stretch
- Rista method ACDNR
- HT/Curves darkening and contrast work

RGB Processing:
- DBE
- Photometric Color Calib
- Magenta Star Fix applied with Star Mask, SCNR for Green, Background Neutralization
- Rista method TGVD, MMT
- Masked Stretch
- Rista method ACDNR
- LRGB Combination

LRGB:
- Saturation increases
- Slight sharpening of galaxies
- HDR work to bring out M87 death ray
- Adam Block Script for Star De-emphasis + MMT for star reduction
- Couple more contrast and color tweaks

______________________________________________________________________________________
Notes for August 2022 Reprocess:

Housekeeping:
- Crop
- DBE
- Downsample 50% (Images Drizzled during Stack)

L Processing:
- Deconvolution
- Rista TGVD, MMT
- HT, MS stretch
- Rista ACDNR
- HDRMT

RGB Processing:
- LFit R, B to G
- Channel Combine RGB
- PCC
- ArcSinH, MaskedStretch
- Rista TGVD, MMT
- SCNR G
- MLT on high-scale Chrominance noise
- LRGB Combination

LRGB Processing:
- MS, MMT, HT using RangeMask to increase IFN contrast
- Adam Block Star Reduction, 4 passes MMT for Star Reduction
- SCNR G
- Saturation increases
- Additional TGVD pass
- Curves for contrast, M87 core

Original
Final
C
D

C

Description: August 2022 Reprocess

Significant improvements in both contrast and color after 2 years improved post-processing experience. Primary changes were better use of Masked Stretch to bring out IFN (some of which I assume to be real, though some may very well be due to poor gradient subtraction or camera noise patterns) and more careful use of HDRMultiscaleTransform to manage the Elliptical Galaxies. Better handling of Chrominance noise via MLT allowed me to maintain a more accurate grey on the galactic fringes as well, when the original version had an odd blue-yellow contrast

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Central USA

ASI1600MM-P 350mm FL
DSO

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