Hubble-inspired Messier 1 - Intermediate processing steps (Paul Macklin)

Hubble-inspired Messier 1 - Intermediate processing steps

Revision title: After star reduction and final black level adjustments

Here are some step-by-step results on my recent M1 photo, as posted here https://www.astrobin.com/dsaojg.

A: Integration of 36 x 10 min dual narrowband exposures in Ha/[OIII]. Basic light pollution removal and star color calibration in AstroPixelProcessor. See also: https://www.astrobin.com/hp5clp

B: Integration of 24 x 10 min dual narrowband exposures in [SII]/Hb. Basic light pollution removal and star color calibration in AstroPixelProcessor.

C: Extracted Ha, [SII], [OIII], and Hb signals, light pollution processing only. Ha mapped to red-orange. [SII] mapped to yellow. [OIII] mapped to cyan. Hb mapped to teal.

D: Recombination of separate narrowband channels in AstroPixelProcessor (using add-scale instead of multiply-scale). Inspired by the iconic NASA image and comparing where my narrowband components best matched theirs, I chose an Ha-S-O-Hb palette:

Ha (red-orange): x1.25

(100,25,1)

[SII] (gold): x2.5

(100,100,1)

[OIII] (blue-green): x1

(1,50,100)

Hb (teal): x6

(1,100,100)

E: After application of BlurXTerminator (an AI deconvolution sharpening filter) in PixInsight

F: After application of NoiseXTerminator (an AI denoising filter) in PixInsight

G: After minor tweaks to black level and contrast curves in PhotoShop

H: After using StarXTerminator to separate and sharpen stars (simple method: reduce gamma).

B

Title: [SII]/Hb image stack

Uploaded: ...

C

Title: 4 separated narrowband colors, mapped to later colors

Uploaded: ...

D

Title: 4-color combination, prior to sharpening and touchup

Uploaded: ...

E

Title: After BlurXTerminator (AI deconvolution sharpening filter)

Uploaded: ...

F

Title: After NoiseXTerminator

Uploaded: ...

G

Title: After minor changes to black level and contrast curves in Photoshop

Uploaded: ...

H

Title: After star reduction and final black level adjustments

Uploaded: ...

	Distinct awarded users	Total awarded images
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	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

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Status	Advanced success
Started	...
Astrometry.net job	8957716
PixInsight job	S16A910LAF0C8WDMVVMFX5XSW0K4K2M2
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	05h34m33s.460
RA (top/left)	05h35m13s.476
RA (top/right)	05h33m53s.789
RA (bottom/right)	05h33m53s.530
RA (bottom/left)	05h35m13s.550

Dec (center)	+22°01′06″.95
Dec (top/left)	+22°10′18″.30
Dec (top/right)	+22°10′22″.36
Dec (bottom/right)	+21°51′55″.56
Dec (bottom/left)	+21°51′51″.27

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