Celestial hemisphere:  Northern  ·  Constellation: Taurus (Tau)  ·  Contains:  Crab nebula  ·  M 1  ·  NGC 1952  ·  Sh2-244
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M1, Crab Nebula, HαRRGB, 19Dec2012+21Nov2014+26Dec2015, David Dearden
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M1, Crab Nebula, HαRRGB, 19Dec2012+21Nov2014+26Dec2015

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I used RGB data from 19 Dec 2012 and 21 Nov 2014, combined with Hα from 26 Dec 2015, to make this image. I played around with processing a bit. I healed out the stars from the Hα and combined the starless Hα with the R channel from the RGB, using a layer mask so it has the RGB data for the stars but Hα for the nebula. I used this to replace the RGB R channel, and boosted the R channel for the nebula a bit using the channel mixer. I also used the Hα as luminosity for the whole image. This mostly was done to address the “blue star” problem I usually have with these images. I’ve still got a little of that close to the nebula but it’s better than before, and I have far more structure within the nebula than I’ve ever gotten with RGB alone.

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M1, Crab Nebula, HαRRGB, 19Dec2012+21Nov2014+26Dec2015, David Dearden