Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

The Lagoon Nebula (M8) imaged in SHO-RGB

astrophotography
  • Please log in to reply
9 replies to this topic

#1 KBALLZZ

KBALLZZ

    Vostok 1

  • *****
  • topic starter
  • Posts: 143
  • Joined: 28 Dec 2015

Posted 29 June 2020 - 09:07 PM

50060261501_1689712302_b.jpg

 

The Lagoon Nebula (M8) imaged in SHO-RGB by Andrew Klinger, on Flickr

 

In this rendition of The Lagoon Nebula, I blended natural color stars into the false-color image of the nebula. The warmer tones represent where Sulfur and Hydrogen lie in the nebula, while the blues represent the Oxygen emissions.

 

Equipment: 
OTA: William Optics GT81 w/0.8x reducer (382mm fl at f/4.7)
74mm aperture stop-down ring (brings scope to f/5.2)
Mount: Orion Sirius EQ-G (HEQ-5)
Guidescope: Orion 50mm guidescope
Guiding camera: Orion StarShoot Autoguider
Imaging camera: ZWO ASI1600MM-Cool

 

Accessories:
DeepSkyDad Autofocuser AF1
QHYCCD PoleMaster

Software: 
SGP
PHD2
CdC
PixInsight

 

Acquisition: 
Location:
Flower Mound, TX for Ha(Bortle 7) - 2018 data
Atoka, OK for RGB(Bortle 3) - 2018 data
Ft. Griffin State Historic Site, TX for OIII and SII(Bortle 2) - 2020 data
Dates: 6/11/18, 7/31/18, 8/1/18, 6/24/20
Gain: 200 Offset: 50 for Ha
Gain: 76 Offset: 15 for RGB
Camera temp: -10C
SII: 25x300" Astrodon 3nm
Ha: 74x300" Astrodon 5nm
OIII: 26x300" Astrodon 3nm
R: 33x180"
G: 27x180"
B: 30x180"
Total integration time: 14hr 55min
64x darks per calibration (master from library)
30x flats per calibration
200x bias per calibration (master from library)

 

Preprocessing:
Batch PreProcessing script to generate calibrated images
StarAlignment
ImageIntegration
DynamicCrop

 

Luminance Processing:
Duplicated the master Ha to use as the luminance
Deconvolution
ArcsinhStretch and HistogramTransformation to bring to non-linear
HDRMT on the core area
Created a duplicate starless version using StarNet++
Combined the starless version with the image using PixelMath expression "F=0.4; (1-(1-$T)*(1-s)*F)+($T*~F)". (s=starless photo)
HistogramTransformation
MultiscaleLinearTransform for sharpening
CurvesTransformation
MorphologicalTransformation using a star mask to completely remove the stars

 

Preparing separate Sii, Ha, and Oiii linear masters for tonemapping (applied to each master individually):
TGV noise reduction (via Jon Rista's method)
ArcsinhStretch and HistogramTransformation to bring to non-linear
HDRMT on the core area (Ha and OIII only)
Removed stars via StarNet++

 

Preparing RGB image:
ChannelCombination to create the color image
BackgroundNeutralization
ColorCalibration
SCNR Green
ArcsinhStretch and HistogramTransformation to bring to non-linear
SCNR Green
CurvesTransformation for saturation
SCNR Green (I'm really making sure no stars are green since that is all I'm using this for)
StarNet++ to remove stars and create an RGB star mask

 

Combined prepared Sii, Ha, and Oiii masters with ChannelCombination:
R: Sii
G: Ha
B: Oiii

 

Tonemap Processing:
HistogramTransformations to balance colors
CurvesTransformations using ColorMasks
Invert>SCNR Green>Invert to remove magenta in core area
CurvesTransformations for saturation adjustments

 

Combined Tonemap with Luminance using LRGBCombination

 

Added in RGB stars using the RGB star mask and PixelMath to add the RGB star-only image to the tonemap

 

MorphologicalTransformation to slightly reduce star sizes
CurvesTransformation to saturate stars
UnsharpMask to slightly sharpen stars
A few cosmetic adjustments to fix introduced RGB artifacts
Resampled to 80% for web posting


  • buckeyestargazer, TimN, mewmartigan and 15 others like this

#2 APshooter

APshooter

    Skylab

  • *****
  • Posts: 4,071
  • Joined: 14 Oct 2013
  • Loc: Camby, In.

Posted 29 June 2020 - 09:09 PM

Wow, that's nice.


  • KBALLZZ likes this

#3 Simcal

Simcal

    Ranger 4

  • *****
  • Posts: 353
  • Joined: 01 Oct 2018
  • Loc: Caledon, Ontario

Posted 29 June 2020 - 09:18 PM

wow, and excellent processing details, ..thank you.


  • KBALLZZ likes this

#4 sunnyday

sunnyday

    Cosmos

  • *****
  • Posts: 8,064
  • Joined: 23 Sep 2019
  • Loc: Ottawa,Canada

Posted 29 June 2020 - 09:23 PM

superb photo with details and colors absolutely beautiful.
well done and thank you.


  • KBALLZZ likes this

#5 brian1052

brian1052

    Vostok 1

  • *****
  • Posts: 136
  • Joined: 06 Sep 2015
  • Loc: Mississippi

Posted 29 June 2020 - 09:51 PM

Beautiful.


  • KBALLZZ likes this

#6 futuneral

futuneral

    Apollo

  • *****
  • Posts: 1,223
  • Joined: 27 Dec 2014
  • Loc: Phoenix, AZ

Posted 29 June 2020 - 10:19 PM

Amazing rendition and thank you for the processing details - will definitely try some of those approaches.


  • KBALLZZ likes this

#7 Jim R

Jim R

    Explorer 1

  • *****
  • Posts: 77
  • Joined: 20 Jul 2017

Posted 29 June 2020 - 10:40 PM

Yet another poster for me to admire their skills.


  • KBALLZZ likes this

#8 chrysalis

chrysalis

    ISS

  • *****
  • Posts: 22,305
  • Joined: 10 Aug 2013
  • Loc: North Central NC

Posted 30 June 2020 - 09:26 AM

Beautiful and psychedelic :bow: !! 


  • KBALLZZ likes this

#9 TareqPhoto

TareqPhoto

    Fly Me to the Moon

  • -----
  • Posts: 5,492
  • Joined: 20 Feb 2017
  • Loc: Ajman - UAE

Posted 30 June 2020 - 10:16 AM

Amazing nice image!


  • KBALLZZ likes this

#10 Fernando134

Fernando134

    Messenger

  • -----
  • Posts: 415
  • Joined: 02 Feb 2013
  • Loc: Brasil

Posted 30 June 2020 - 01:13 PM

Great image!!!


  • KBALLZZ likes this


CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics





Also tagged with one or more of these keywords: astrophotography



Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics