• br3d@lemmy.worldEnglish
    3·
    5 hours ago

    That’s a beautiful image - and very impressive with a 6" Newt. Nice work

  • lefty7283@lemmy.worldOPMEnglish
    3·
    6 hours ago

    WR-134 is the purple looking star in the middle. Don’t think the purple color itself is ‘natural’ but I thought it looked neat and decided to keep it like that. The nebulosity in this image is false color (although the HOO palette is kinda close to true color), and the stars themselves are RGB true color. Even though I was able to get some of the entire Oiii shell around WR134, I decided not to push it too much in processing. At some point I’ll shoot it again from darker skies. Captured over a bunch of nights in November 2025 from a Bortle 9 zone.

    Places where I host my other images:

    Flickr | Pixelfed

    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: 28 hours 20 minutes (Camera at unity gain, -15°C)

    • Ha - 51x600"

    • Oiii - 113x600"

    • R - 32x60"

    • G - 30x60"

    • B - 30x60"

    • Darks- 30

    • Flats- 30 per filter

    Capture Software:

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

    PixInsight Preprocessing:

    • BatchPreProcessing

    • StarAlignment

    • Blink

    • ImageIntegration per channel

    • DrizzleIntegration (2x, Var β=1.5)

    • Dynamic Crop

    Narrowband linear:

    • MultiscaleGradientCorrection using MARS Project data

    • BlurXterminator

    • StarXterminator to completely remove stars (extracted stars processed separately)

    • STF applied via HistogramTransformation to stretch nonlinear

    RGB Linear:

    Channelcombination to make color image from RGB stacks

    • MultiscaleGradientCorrection

    • SpectrophotometricColorCalibration

    • BlurX (correct only mode)

    • HSV Repair

    • StarX to extract a stars only image

    • ArcsinhStretch + HistogramTransformation to stretch nonlinear

    • Slight curves saturation boost

    Nonlinear Processing

    • PixelMath to combine stretched Ha and Oiii images into a color image (HOO --> RGB)

    • Shitloads of curve transformations to adjust luminance, contrast, saturation, etc

    • DeepSNR Noise reduction

    • ColorSaturation adjustments (with Oiii mask)

    • More curves

    • LocalHistogramTransformation

    • Even more curves

    • NoiseXTerminator for some small scale chrominance noise reduction

    • Guess what more curves its the best tool in pixinsight 10/10

    • Pixelmath to add in the stretched stars only image from earlier

      This basically re-linearizes the two images, adds them together, and then stretches them back to before. More info on it here)

      mtf(.005,

      mtf(.995,Stars)+

      mtf(.995,Starless))

    • Resample to 70%

    • Annotation