Andromeda again... (Eric W. Gregory)

Celestial hemisphere: Northern · Constellation: Andromeda (And) · Contains: Great Nebula in Andromeda · M 31 · M 32 · NGC 221 · NGC 224

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Andromeda again...

Another stack of images of Andromeda. I tried processing everything a bit differently. Instead of using dark frames for this one, I used "astro noise" reduction in Nikon NX-D, and cranked the overall noise reduction up to 70 (of 100). Additionally, I used Nikon's Pic Control settings set to "neutral," modified the black point slightly, then exported to 16 bit .tif files.

From there, into Nebulosity 4 went everything. I used 20 bias frames and 20 flats, batch processed, then normalized, and finally stacked. From there I stretched things a little bit in Nebulosity, then imported to Lightroom where I further tweaked black point and exposure.

To make a long story longer, I'm more satisfied with this one than the other shots I've done so far. It turns out that doing dark frames with a Nikon D7100 isn't needed and actually seems to make images more difficult to process. The noise reduction functions in NX-D seem to be an absolute must if you shoot Nikon. The results (so far) seem to be quite superior than using actual dark frames.

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Distribution of astrophotographers

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	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
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Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	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

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Basic success
Started	...
Astrometry.net job	1191473
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Andromeda again...

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