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Amazing how you can miss the obvious thing to do...


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My recent image of the Tadpoles nebula got a lot of positive comment. I think this was due to the extraordinary nature of the target rather than my skill with imaging, as poor Sii data (in particular) gave a very noisy background and rather poor detail.

 

I tweaked the colour yesterday, but for some reason it only struck me this morning that I could add the Ha layer as luminance and bring everything under control at a stroke and reintroduce much of the fainter parts...

 

673474334_TadpoleSHO.thumb.jpg.ced93d6c767dd3914ab91f5e73b8ce65.jpg

 

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1 hour ago, Stub Mandrel said:

My recent image of the Tadpoles nebula got a lot of positive comment. I think this was due to the extraordinary nature of the target rather than my skill with imaging, as poor Sii data (in particular) gave a very noisy background and rather poor detail.

 

I tweaked the colour yesterday, but for some reason it only struck me this morning that I could add the Ha layer as luminance and bring everything under control at a stroke and reintroduce much of the fainter parts...

 

673474334_TadpoleSHO.thumb.jpg.ced93d6c767dd3914ab91f5e73b8ce65.jpg

 

You can also combine the 3 stacks into a Lum layer, this way you pick up all the detail from each filter. Image integration will stack them with different weights the one with most signal receives the most weight.

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Posted (edited)
8 hours ago, AstronomyUkraine said:

You can also combine the 3 stacks into a Lum layer, this way you pick up all the detail from each filter. Image integration will stack them with different weights the one with most signal receives the most weight.

 

In this case that would defeat the benefits of excluding the relatively poor quality Oiii and Sii data.

 

I can see the benefit of doing that where all three layers are good quality (and where there are areas of O or S that would be blank or poor in Ha).

 

In the image the colour layer is binned 2x2 to reduce noise (with limited success, especially on the Sii data) then resampled  to match the Ha for the final version.

Edited by Stub Mandrel
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