IC 1275, HαRRGB, Method 1, 22Jul,15-16 Aug 2014 (David Dearden)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: B302 · B303 · B91 · IC 1274 · IC 1275 · IC 4685 · NGC 6559 · Sh2-29 · Sh2-32

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IC 1275, HαRRGB, Method 1, 22Jul,15-16 Aug 2014

I’m learning more about HαRRGB combining. This image uses RGB from 22 Jul 2014 and Hα from 15, 16 Aug 2014. Interestingly, the scale was slightly different because in the RGB image I removed the Meade IR cut filter, putting the focal reducer slightly closer to the imager than in the Hα, where it was present. So I had to translate, rotate, and scale align the Hα and the RGB in Nebulosity. The choice of stars in this alignment is critical; they need to be bright enough to show up in the Hα image, but not bright enough to bloat badly in the RGB. I mainly followed Starizona method 1 for this image, with one major modification: after replacing the original R with HαR, I boosted the red channel using the Photoshop Channel Mixer by 175%. This prevents the image from looking really blue (especially the stars). After that I used the HαR for luminosity, used local contrast enhance, and boosted the saturation a bit.

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	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
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Amateur hosting facility
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Professional, scientific grade data
Mix of multiple sources
Other
Unknown

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Status	Advanced success
Started	...
Astrometry.net job	343154
PixInsight job	5I2RSZS4EE2XRE0VJ6GYVT471WLN26IZ
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	18h09m46s.44
RA (top/left)	18h08m34s.39
RA (top/right)	18h08m31s.100
RA (bottom/right)	18h10m58s.24
RA (bottom/left)	18h10m57s.92

Dec (center)	-23°50′18″.5
Dec (top/left)	-23°28′26″.1
Dec (top/right)	-24°11′51″.2
Dec (bottom/right)	-24°12′05″.4
Dec (bottom/left)	-23°28′36″.1

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IC 1275, HαRRGB, Method 1, 22Jul,15-16 Aug 2014

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IC 1275, HαRRGB, Method 1, 22Jul,15-16 Aug 2014

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