this post was submitted on 23 Jan 2024
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Astrophotography

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[–] lefty7283 2 points 10 months ago

Continuing to reprocess old data since I've realized my processing skills were shit back when I originally shot this galaxy in 2019. I'm a lot happier with the more natural colors and better noise reduction on this one. Captured on April 22nd and 23rd, 2019 from a bortle 7 zone.

Places where I host my other images:

Flickr | Instagram |


Equipment:

  • TPO 6" F/4 Imaging Newtonian

  • Orion Sirius EQ-G

  • ZWO ASI1600MM-Pro

  • Skywatcher Quattro Coma Corrector

  • ZWO EFW 8x1.25"/31mm

  • Astronomik LRGB+CLS Filters- 31mm

  • Astrodon 31mm Ha 5nm, Oiii 3nm, Sii 5nm

  • Agena 50mm Deluxe Straight-Through Guide Scope

  • ZWO ASI-290mc for guiding

  • Moonlite Autofocuser

Acquisition: 2 hour 47 minutes (Camera at Unity Gain, -20°C)

  • CLS- 52x120"

  • Red- 21x60"

  • Green- 21x60"

  • Blue- 21x60"

  • Darks- 30

  • Flats- 30 per filter

Capture Software:

  • Captured using N.I.N.A. and PHD2 for guiding and dithering.

PixInsight Processing:

  • BatchPreProcessing

  • SubframeSelector

  • StarAlignment

  • Blink

  • ImageIntegration

Linear:

  • DynamicCrop

  • DynamicBackgroundExtraction 2x

duplicated each image and removed stars via StarXterminator. Ran DBE with a shitload of points to generate background model. model subtracted from original pic using the following PixelMath (math courtesy of /u/jimmythechicken1)

$T * med(model) / model

Luminance Linear:

  • BlurXTerminator

  • ArcsinhStretch + HT to stretch nonlinear

RGB Linear:

  • ChannelCombination to combine monochrome Red Green and Blue stacks into color RGB image

  • SpectroPhotometricColorCalibration

  • BlurXTerminator

  • DeepSNR

  • HSV Repair

  • ArcsinhStretch + HT to stretch nonlinear

NonLinear:

  • LRGBCombination to add stretched L as a luminance layer to RGB

  • Several Curve transformations to adjust lightness, contrast, saturation, hues, etc with various masks

  • DeepSNR again

  • MLT for large scale chrominance noise reduction

  • More Curves

  • Invert > SCNR green > Invert to remove some magentas from stars

  • LocalHistogramEqualization

  • even more curves

  • DynamicCrop

  • Annotation