M 33 -- HaLRGB (Scott Badger)

Celestial hemisphere: Northern · Constellation: Triangulum (Tri) · Contains: IC 132 · M 33 · NGC 595 · NGC 598 · NGC 604 · Triangulum Galaxy · Triangulum Pinwheel

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M 33 -- HaLRGB

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M 33 -- HaLRGB

I used BlurXterminator on this image and fwiw (since we’re all in learning mode with it) I used the manual PSF mode. At first, I wasn't clear from the documentation how a specified PSF worked with localized measurement and application, but Russell Croman responded that the specified PSF, while applied across the image, is only used for non-stellar deconvolution. Deconvolution of the stars is always based on local measurements. It's in the documetation, but not quite as directly stated. In any case, the settings I used on both Lum and RGB were 0.6 for amount and a PSF diameter of 4 pixels. The defaults and Auto PSF went too far and created a lot of worminess. Four pixels is also a lower PSF than the mean for the image, but I found that playing with the manual PSF setting, along with the amount setting, was an effective way to control artefacts.

On a different processing note, I should point out a wee bit of blatant image manipulation. There are two gas/dust clouds, IC 132 and NGC 588, that I masked when I added the Ha data to preserve their broadband color--a bright green, and since green doesn't exist in space...... They’re both in the left-hand periphery of the galaxy, at about 9 o’clock and 11:30 respectively. I looked at a number of other M33 images and while some also show the green color, most don’t. Maybe because the use of SCNR in PI to remove all green is such a common workflow process? In any case, they were the only instance of green in the image after color calibration with SPCC, so a 'real' color it seems.

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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	6880930
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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M 33 -- HaLRGB

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