Barnard 150 (RGB) (Linda)

Barnard 150 (RGB)

Link: https://lindasastronomyadventures.space/?p=11674

Summer may be coming to an end but the Summer of Darkness continues!

Sometimes you find an image that flirts with which side of the "can I do what I envisioned with it" or "can't I" line it is on and this was one of those.I knew from seeing some other images that there was som detail to be had but try as I might which has been something like 6 or 7 times, I couldn't quite get where I wanted though I think I got as close as the combination of the data and my own skill would let me. The ultimate challenge was that the dark nebula levels were so close to the background levels that It was challenging to create some visual separation between them. The only way I could do it was to raise the background level higher than I normally would so I could then depress the dark nebula and still leave some detail. To make matters worse, the stretch needed for this was so strong that it brought out a couple of imperfections in the flats.

Here's how I processed this, first in PixInsight:

RGB:
channel combination
DBE
SPCC
blurXterminator
starXterminator (extracting unscreened stars)
noiseXterminator
histogram transformation (using a saved STF stretch from when the tars were still there)
noiseXterminator again because the stretch was so strong it brought out more noise
Game/Histrogram combos to bring down levels of star halos a bit

stars:
GHS
unsharp mask (very mild sharpening)

save starless and stars as 16-bit tiff for photoshop

Photoshop:
open starless
add stars as screen layer
Use content aware fill on starless layer to correct flat imperfections
combination of levels & camera raw to tweak starless to find the right balance between background and nebula

Overall this was challenging. I thought the larger than intended amount of data would be a help but it was mostly in green and blue where red might have been more helpful.

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Status	Advanced success
Started	...
Astrometry.net job	8409355
PixInsight job	4LECVZBEBFYEIT7Q0NB5658FM59IJL32
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	20h50m58s.992
RA (top/left)	20h47m01s.841
RA (top/right)	20h54m58s.476
RA (bottom/right)	20h55m00s.879
RA (bottom/left)	20h46m54s.658

Dec (center)	+60°15′49″.19
Dec (top/left)	+59°55′10″.35
Dec (top/right)	+59°55′34″.13
Dec (bottom/right)	+60°35′57″.89
Dec (bottom/left)	+60°35′35″.33

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Barnard 150 (RGB)

Barnard 150 (RGB)

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Barnard 150 (RGB)

Barnard 150 (RGB)

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