SIRIL Test of Stacking Substacks verusus All Images Together (Animated .GIF compare) (Steven Miller)

Celestial hemisphere: Northern · Constellation: Camelopardalis (Cam) · Contains: IC 342

SIRIL Test of Stacking Substacks verusus All Images Together (Animated .GIF compare), Steven Miller

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SIRIL Test of Stacking Substacks verusus All Images Together (Animated .GIF compare)

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SIRIL Test of Stacking Substacks verusus All Images Together (Animated .GIF compare)

With my short exposures resulting in thousands of lights and my Alt/Az field rotation, there are some real advantages in SIRIL in stacking my lights in 10 or 20 subsets and then stacking those results together. Spot testing indicates the quality is, on average, equivalent. Here is a small test with the Hidden Galaxy showing stacking 20 subsets (72 * 8 second lights per set) and then stacking those together versus stacking all lights at once.

I've done about 4 tests and found that they are in general equivalent. There are always very minor differences in noise and details but once finally processed with equivalent levels of processing to the best of my ability, they are generally indistinguishable. The differences are much less than minor editing preferences like the amount of sharpening applied or the amount of noise reduction... even minor editing difference tweaks are a much greater impact. So this indicates to me for all practical purposes, stacking as substacks and stacking them all together is equivalent.

For me there are three implications:

1) I can do this on my long captures with thousands of lights to reduce stacking time.
2) I can save these substacks as "virtual long lights" to then more easily integrate together with other sub-stacks on multilight captures.
3) I can also normalize my substacks to equivalent "virtual long lights" of, say, 10 or 20 minutes each and for me this helps when I may use a different exposure time on different nights due to technical reasons (telescope tracking issues, wind, etc...).

Please note: The following tables are updated every 24 hours.

Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	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
Landscape

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.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
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	9605140
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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SIRIL Test of Stacking Substacks verusus All Images Together (Animated .GIF compare)

SIRIL Test of Stacking Substacks verusus All Images Together (Animated .GIF compare)

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Image Index:

Contribution Index (beta):

SIRIL Test of Stacking Substacks verusus All Images Together (Animated .GIF compare)

SIRIL Test of Stacking Substacks verusus All Images Together (Animated .GIF compare)

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