Twilight Waxing Crescent to Dark Sky Image (Steve Lantz)

Contains: Solar system body or event

Twilight Waxing Crescent to Dark Sky Image

Acquisition type: Lucky imaging

Twilight Waxing Crescent to Dark Sky Image

Acquisition type: Lucky imaging

The original image was the waxing crescent moon in fairly bright twilight. So here starts the fun. Niall MacNeill and I were messing around with processing flows to take a twilight image and convert it to a black sky background while ending up with detail in the subject that was as if the image had been originally taken in dark skies. We tried building an RGB dark sky image with: the difference algorithm in Photoshop, sneaky masking tricks in Photoshop and using the image subtraction feature in ImageJ. The results were quite promising and interesting! For the moon image posted here, I used the Photoshop color sampler dropper to sample the background sky in the original image. Then I used the brush tool to color out the moon, leaving the background color only. Niall and I reasoned that the sky background color is actually in front of the subject, so sky background is automatically "added to" the subject. Thus, subtracting the background from everything turns the background black and also corrects the subject. After the dark sky product was obtained, futher standard image processing was done to spiff things up. 20 frames were selected out of 477 for stacking.

Original
B
Final
C

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	Distinct awarded users	Total awarded images
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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
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Northern lights
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	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
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Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

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Astrometry.net job	n/a
PixInsight job	n/a
PixInsight queue size	n/a
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Twilight Waxing Crescent to Dark Sky Image

Twilight Waxing Crescent to Dark Sky Image

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Twilight Waxing Crescent to Dark Sky Image

Twilight Waxing Crescent to Dark Sky Image

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