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The Lagoon Nebula (M8) imaged in HaRGB, Andrew Klinger
The Lagoon Nebula (M8) imaged in HaRGB
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The Lagoon Nebula (M8) imaged in HaRGB

The Lagoon Nebula (M8) imaged in HaRGB, Andrew Klinger
The Lagoon Nebula (M8) imaged in HaRGB
Powered byPixInsight

The Lagoon Nebula (M8) imaged in HaRGB

Equipment

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Acquisition details

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Description

Equipment:

OTA: William Optics GT81 w/0.8x reducer (382mm fl at f/4.7)

Mount: Orion Sirius EQ-G (HEQ-5)

Guidescope: Orion 50mm guidescope

Guiding camera: Orion StarShoot Autoguider

Imaging camera: ZWO ASI1600MM-Cool

Software:

SGP

PHD2

CdC

PixInsight

Acquisition:

Location: Flower Mound, TX for Ha(Bortle 7), Atoka, OK for RGB (Bortle 3)

Dates: 6/11/18, 7/31/18, 8/1/18

Gain: 200 Offset: 50 for Ha

Gain: 76 Offset: 15 for RGB

Camera temp: -10C

Ha: 74x300" Astrodon 5nm

R: 33x180"

G: 27x180"

B: 30x180"

Total integration time: 10hrs 40min

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

LocalNormalization

ImageIntegration (Linear Fit rejection)

DynamicCrop each master

DBE each master

Ha Processing:

Deconvolution

TGV & MMT noise reduction (via Jon Rista's method)

HistogramTransformation x2

Duplicated the image to create a starless version, using a starmask and several iterations of MMT and MT. Then pushed the faint nebulosity in the starless version using PixelMath expression: "1-(1-$T)*(1-$T)".

Combined the starless version with the image using PixelMath expression "F=0.4; (1-(1-$T)*(1-s)*F)+($T*~F)" (s=starless photo).

HDRMultiscaleTransform

LocalHistogramEqualization

DarkStructureEnhance Script

MorphologicalTransformation for slight star reduction

RGB Processing:

Linear fit to Blue master

ChannelCombination

SCNR green 50%

TGV and MMT noise reduction (via Jon Rista's method)

ArcsinhStretch a small amount

HistogramTransformation to bring to non-linear

SCNR green 100%

Curves Transformation for saturation

ColorSaturation to saturate blues furthur

Combine Ha and RGB with SHO-AIP script

SCNR green 100%

PixelMath to blend in original RGB stars

CurvesTransformation to neutralize background

PixelMath to blend in more blue reflection nebula from the RGB image

Comments

Sky plot

Sky plot

Histogram

The Lagoon Nebula (M8) imaged in HaRGB, Andrew Klinger