NGC 7822 – also known as the Question Mark nebula !
Equipment
- Samyang 135mm f/2
- QHY163M
- Baader narrowband filters
- Sky-Watcher HEQ5 Pro
- QHY5L-II-C and QHY 30mm guidescope
Acquisition (Total : 18.5h)
- Location : Backyard, bortle 5
- Ha : 221x180s (11h)
- OIII : 90x300s (7.5h)
Processing (PixInsight)
Individual channel processing
- Gradient removal (DBE)
- Deconvolution on Ha (tutorial)
- Noise reduction (TGV and MMT)
- HistogramTransformation
Color combination (tutorial)
- StarNet++ on Ha and Oiii
- Creating the dynamic factor
- f : Oiii
- Boosted using curves
- f : Oiii
- Simulating the SII channel
- Sii : Ha
- Flattened using HDRMMT and curves
- Sii : Ha
- Combining the channels with PixelMath
- R : f*Sii + ~f*Ha
- G : f*Ha + ~f*(.3*Sii+.7*Oiii)
- B : Oiii
- Blending with a SCNR’d SHO image
- f*SHO + ~f*Custom
Luminance processing
- Protective stretch (tutorial coming soon)
- Star reduction (tutorial)
LRGB processing
- LRGBCombination
- CurvesTransformation
Taken in November 2020
for some reason I am not understanding the dynamic factor. When you say f: OIII what are you referring to? Thanks!
Hi, I’m referring to my “Dynamic narrowband combinations” tutorial! The reason why you didn’t understand what I meant by dynamic factor is simply because it’s a term I made up 🙂