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IC1396 - RGB SHO - Elephant's Trunk Nebula in Cepheus, 





    
        

            Daniel.P

IC1396 - RGB SHO - Elephant's Trunk Nebula in Cepheus

Technical card

Resolution: 4656x3520

Dates:Aug. 14, 2018

Frames:
AstroDon 5nm Ha filter: 9x600" (gain: 139.00) -18C bin 1x1
AstroDon 5nm OIII filter: 8x600" (gain: 139.00) -18C bin 1x1
AstroDon 5nm SII filter: 8x600" (gain: 139.00) -18C bin 1x1
ZWO new B: 10x120" (gain: 139.00) -18C bin 1x1
ZWO new G: 10x120" (gain: 139.00) -18C bin 1x1
ZWO new R: 10x120" (gain: 139.00) -18C bin 1x1

Integration: 5.2 hours

Darks: ~10

Flats: ~10

Flat darks: ~20

Avg. Moon age: 3.51 days

Avg. Moon phase: 13.30%

Mean SQM: 21.20

Mean FWHM: 2.50

Astrometry.net job: 2393233

Locations: Duc, Prayssas, Lot et Garonne, France

Data source: Backyard

Description

Multi star guided.

The version D is a quick test with only SHO channels.
It is interesting to note that after tricolor combination R=SII, G=Ha & B=OIII, I did an SCNR to remove green neutral, which had the effect of giving a good color for stars (no magenta).
This image show how small are the stars as compared to the RGB (slightly below 2 arcsec of FWHM).

Version F : RGB image : the Colo saturation was selectively applied to the stars using a NL light mask

The processing was done in PI as follow (version original):
For each R ,G ,V, Ha, OIII & SII channels :
- Flat Field Dark Substraction
- Flat Field Integration
- Images Calibration (Dark Substraction for RGBSHO and FF correction only for RGB (no need for SHO ...))
- Cosmetic Correction
- Image Registration
- Image Integration
- Noise Reduction (Demure) with 0.9 as variance

Using each integrated channel :
- Created RGB color image using channel combination
- Color balance on stars using a star mask
- Created RGBSHO image using NBLRGB combination tool
- Nonlinear Image Creation using NBRGB values
- Color balance on all image
- Perform SCNR (neutral 70%)
- Color saturation with boost in blue
- Color saturation with mask on star only
Final image adjustments performed in Iphoto on Imac (levels adjustments and deflip)

Comments

Author

Daniel.P
Daniel.P
License: None (All rights reserved)
1521
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Revisions

  • IC1396 - RGB SHO - Elephant's Trunk Nebula in Cepheus, 





    
        

            Daniel.P
    Original
  • Final
    IC1396 - RGB SHO - Elephant's Trunk Nebula in Cepheus, 





    
        

            Daniel.P
    C
  • IC1396 - RGB SHO - Elephant's Trunk Nebula in Cepheus, 





    
        

            Daniel.P
    D
  • IC1396 - RGB SHO - Elephant's Trunk Nebula in Cepheus, 





    
        

            Daniel.P
    E
  • IC1396 - RGB SHO - Elephant's Trunk Nebula in Cepheus, 





    
        

            Daniel.P
    F

C

With 50% mix of an HDRMultiscale image

D

Pure SHO quickly done

E

Ha channel

F

RGB image

Histogram

IC1396 - RGB SHO - Elephant's Trunk Nebula in Cepheus, 





    
        

            Daniel.P

In these public groups

ZWO ASI1600MM/QHY163M