Blue Horsehead, IC 4592, processed for more star color (Jeff Bottman)

Celestial hemisphere: Southern · Constellation: Scorpius (Sco) · Contains: IC 4592 · IC 4601 · The star Graffias (β1Sco) · The star β2Sco · The star νSco · The star χOph · The star ψOph · The star ω1Sco · The star ω2Sco

Blue Horsehead, IC 4592, processed for more star color, Jeff Bottman

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Blue Horsehead, IC 4592, processed for more star color

Powered byPixInsight

Blue Horsehead, IC 4592, processed for more star color

I've been learning a lot more about PixInsight by carefully reading through Rogelio Bernal Andreo's EXCELLENT new book on PI. Highly recommended. Just out so only available in pdf download, but soon to be printed I believe. Anyway, I learned that the stretching process "ArcsinhStretch" was designed to preserve star colors. So, I tried it on my Blue Horse image, but found it rendered saturated stars with a pinkish middle. To mitigate that, I did a partial stretch with HistogramTransformation, then finished the stretch with ArcsinhStretch. That still pretty much preserved star colors but largely got the pink out, for a more natural result. Then I split the image into stars/no stars with Starnet, shrunk the stars via MorphologicalTransform, then recombined for a less star-intensive result.

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

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Blue Horsehead, IC 4592, processed for more star color

Blue Horsehead, IC 4592, processed for more star color

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Blue Horsehead, IC 4592, processed for more star color

Blue Horsehead, IC 4592, processed for more star color

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