M84 (MSFFT) - AstroBin

M84

Messier 84, a galaxy in Virgo. More importantly, it is part of Markarian's Chain of galaxies.

Processing in Pixinsight using NSG, DBE, and PCC. ColorCombined RGB and Luminance stretched using Histogram Transformation then adjusted with HDR Multiscale Transform. L and RGB combination using LRGB Combination. Nonlinear processing using SCNR, a touch of TGV Denoise with Range Mask, a curves transformation to boost highlights/reduce shadows, and a final curve adjustment for color.

This is only my second LRGB image and there is still some learning to be done. The image was generally noisy (thanks to location and the constant growth of neighborhood lighting), but the noise was at least fairly uniform/well distributed. The biggest issue is actually the various color masters appear to be slightly distorted from one another: that is, the Blue and Red masters are not aligned across the entire field. It was the first time using batch preprocessing rather than manually so we'll have to explore that potential source.

There is also some coloration in the background...not sure how much is real and how much should have been removed in processing.

I'll also have to take a close look at RGB subframe duration. I typically used my older OSC camera with 5 minute subframes: and while the 2-minute RGB frames help me keep more of them, it may have also affected the total noise.

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 pending
Started	...
Astrometry.net job	5680333
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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