IC434 – The Horsehead Nebula

ic434-lrgb-final

Seventeen 5-minute light frames, calibrated, registered, stacked, and post-processed using PixInsight. I have tried and failed to capture the Horsehead nebula before, so I’m glad to finally tick this one off!

Date taken: 13/03/2015
Location: Adelaide, South Australia
Camera: Canon 450d w/ IR filter removed, GSO coma corrector
ISO800
Mount: HEQ5PRO
Scope: GSO 8″ f/5 Newtonian
Autoguider: Orion Starshoot AG
Imaging: BackyardEOS w/ PHD dithering
Guiding: PHD2
50 bias frames, 20 dark frames, 50 flat frames.
Total integration time: 85 minutes

Pre-Processing details:

  • BatchPreProcessing, calibration only
  • BatchDebayer
  • Star Alignment
  • Image integration (using Winsorized Sigma Clipping)
  • Automatic Background extraction
  • Dynamic Crop to remove some of the dodgy edges
  • Automatic Background extraction to remove any remaining unwanted gradients
  • Extracted luminance from the RGB for later on

Processing the RGB Image:

  • Background Neutralisation
  • Colour Calibration
  • scnr to remove the green tinge
  • atrouswavelettransform (masked, duplicate image, STF autostretch)
  • multiscalemediantransform (masked, duplicate image, STF autostretch)
  • Histrogram Transformation
  • atrouswavelettransform (masked, L channel extracted post-histogram extraction)
  • ACDNR (masked, L channel extracted post-histogram extraction)
    atrouswavelettransform (blurring the image)

Processing the luminance image:

  • atrouswavelettransform (masked, duplicate image, STF autostretch)
  • multiscalemediantransform (masked, duplicate image, STF autostretch)
  • Histrogram Transformation
  • atrouswavelettransform (masked, cloned image with auto clip shadows/highlights)
  • ACDNR (masked, cloned image with auto clip shadows/highlights)

Putting the images together:

  • LRGBCombination, saturation initial tweak.
  • Curves, increase contrast, bring out details
  • Rotated 90°