NGC4236: this time with collimated optics :-) (Ulli_K)

NGC4236: this time with collimated optics :-)

After my first image with non-collimated optics I gave NGC4236 another try: I had the cahnce of three clear nights in mid of February and captured 352x 240s subs - in total 23,5h hours. It was worth it!
My workflow in PI was:

WBPP script
Rotation
DynamicCrop
DynamicBackgroundExtraction
SpectroPhotometicColorCalibration
HSV script
Deconvolution
MultiScaleMedianTransform (denoise)
MaskedStretch
NoiseXTerminator
StarNet2
Galaxy

GenerlizedHyperbolicStretch
HDRTransformation (improve structures in galaxy)
LocalHistogramEqualization
CurvesTransformation (reduce background brightness)

Stars

CurvesTransformation (reduce brightness)
ColorSaturation

PixelMath (combination of stars and Gx)
ExponentialTransformation
Annotation

Unfortunately, it was difficult to out some more colour of the Ha regions. Comments and critics are welcome.
CS
Ulli

Losmandy mounts
Imaged with APT
Vixen R200SS
Optolong L-Pro filter
ToupTek and rebranded cameras
Fast Newtonians
CMOS Imagers
Imaged with N.I.N.A.
Astrophotography Germany

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 failed
Started	...
Astrometry.net job	7404961
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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