M17 - The Omega Nebula (Reprocessed) (live.staticflickr.com)

submitted 9 months ago by lefty7283@lemmy.world to c/astrophotography@lemmy.world

3 comments fedilink hide all child comments

top 3 comments

sorted by: hot top controversial new old

[-] lefty7283@lemmy.world 2 points 9 months ago* (last edited 9 months ago)

M17 is also known as The Swan Nebula (the bright core is swan shaped, esp when viewed visually through a telescope). Also pictured it the M18 star cluster off to the right.

I originally shot this back in 2019 and decided to reprocess it since we have fun new tools and techniques (and I kinda know what I'm doing now with narrowband processing). I decided to keep the palettes similar overall, but with a less agressive stretch and more 'natural' look to the nebula. The noise reduction is a lot better when comparing the images at 1:1 (long gone are the days of TGV/MMT noise reduction!). Captured over 2 nights at the in May, 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
Agena 50mm Deluxe Straight-Through Guide Scope
ZWO ASI-120MC for guiding
Moonlite Autofocuser

Acquisition: 8 hours 10 minutes (Camera at Unity Gain, -15°C)

Ha- 42x300"
Oiii- 56x300”
Darks- 30
Flats- 30 per filter

Capture Software:

EQMod mount control. Captured using N.I.N.A. and PHD2 for guiding and dithering.

PixInsight Processing:

BatchPreProcessing
Blink
ImageIntegration
DrizzleIntegration (2X, VarK 1.5)
DynamicCrop
DynamicBackgroundExtraction

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

Narrowband Linear:

BlurXTerminator
NoiseXTerminator
STF Applied via HT to stretch nonlinear

Nonlinear:

PixelMath to combine monochrone Ha and Oiii channels into color image (using ForaxX's bicolor palette):

R = Ha

G= ((Oiii*Ha)^~(Oiii*Ha))*Ha + ~((Oiii*Ha)^~(Oiii*Ha))*Oiii

B = Oiii

SCNR Green
LRGBCombination with stretched Ha as luminance
Shitloads of curve transformations to adjust lightness, contrast, hues, saturation, etc
LocalHistoGramEqualization 2x - one at scale 16 for fine details and one at 512 for large structures
More curves
DarkStructureEnhance
MLT for small scale chrominance noise reduction
NoiseXTerminator
Even more curves, some masked to just the core of the nebula
Resample to 60%
Annotation

[-] rvdz@lemmy.world 2 points 9 months ago

Fantastic work!

[-] Vakbrain@lemmy.dbzer0.com 2 points 9 months ago

Breathtaking!

this post was submitted on 20 Jan 2024

42 points (100.0% liked)

Astrophotography

1698 readers

33 users here now

Welcome to !astrophotography!

We are Lemmy's dedicated astrophotography community!

If you want to see or post pictures of space taken by amateurs using amateur level equipment, this is the place for you!

If you want to learn more about taking astro photos, check out our wiki or our discord!

Please read the rules before you post! It is your responsibility to be aware of current rules. Failure to be aware of current rules may result in your post being removed without warning at moderator discretion.

Rules

I | Real space images only.

Astrophotography refers to images of astronomical objects or phenomena exclusively.
~~Images that show objects or people below the Kármán Line (100km) will be removed.~~ We won't be enforcing this rule for now, but as the community grows eventually we will split and have a separate space for just landscape astro.
Images must be an accurate representation of a real astronomical object.
See this page for more details

II | Original and Amateur Content Only

Image posts can only be images that you have captured and processed yourself, or discussion about capturing and/or processing your own images.
Images acquired from public sources, professional observatories, or other professional services are not allowed.
If you have done a drastic alteration or reprocessing of a prior submission, you may repost your edit - but only after a minimum of one week has passed.

III | Post Types

Image posts are to link directly to the image, not to landing pages, personal galleries, blogs, or professional sites. Link to these in the comments. (AstroBin and Imgur, are allowed)
Questions are welcome here for the time being.
Links to blogs, articles or external websites should be interesting and promote discussion about amateur astrophotography.

IV | Titles

All image posts should just include include the name of the object being photographed. Extra info such as equipment, it being your first image, or other information should go in a comment along with your acquisition info. Please see this page for more details.

If your post is removed, try reposting with a different title. Don't hesitate to message the mods if you still have questions!

V | Acquisition and Processing Information

All submitted images must include acquisition and processing details as a top-level comment. All posts without this information may be given a warning, and if not updated will be removed.
This includes the telescope, mount, camera, accessories, and any other pieces of equipment you used to capture the image.
You must also include processing details, i.e. the programs you used and a general rundown of the workflow/processes you used within those programs. “Processed in Photoshop” is not enough.

founded 1 year ago

MODERATORS

bigborpa@lemmy.world

lefty7283@lemmy.world