Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Crescent nebula  ·  NGC 6888
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NGC 6888, Crescent Nebula, HαRGB, 20Jun12+8Aug14, David Dearden
NGC 6888, Crescent Nebula, HαRGB, 20Jun12+8Aug14
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NGC 6888, Crescent Nebula, HαRGB, 20Jun12+8Aug14

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I'm still trying to learn HαRGB combining. This HαRGB was combined in StarTools from 8 Aug 2014 Hα and 20 Jun 2012 RGB. StarTools does a better job with this than I can do with PhotoShop so far, and it’s fairly automatic, although I did have to work pretty hard for this particular image. Eventually I combined an image where I used Hα for luminance and replaced the red channel of the RGB with Hα, with another where I used the Hα luminance and straight RGB, via a layer mask. That kept the stars from looking strange (HαHαGB had funny star colors) and also kept the color reasonable in the nebulosity (HαHαGB cut down the green a bit). It may still be a bit too green, but it’s the best so far.

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NGC 6888, Crescent Nebula, HαRGB, 20Jun12+8Aug14, David Dearden