Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Crescent nebula  ·  NGC 6888
NGC 6888 in Narrow Band Ha, NII+OIII, OIII, Ted D.
NGC 6888 in Narrow Band Ha, NII+OIII, OIII
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NGC 6888 in Narrow Band Ha, NII+OIII, OIII

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This image used the Ha 3nm monochrome image data taken in July 2014, with additional 3nm Olll and NII. I originally started this image work flow as RGB mapped to HOO however I did not like the results. When I added NII data, the image came together much easier. The green channel is 0.25 NII + 0.75 OIII. This combination gave a nice teal blue/green O component to the image instead of a heavily blue and magenta using this data in HOO.

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NGC 6888 in Narrow Band Ha, NII+OIII, OIII, Ted D.