NGC 2264 Cone Nebula, Christmas Tree Cluster in HOO

[sloz1664]

Finally gathered some Oiii data to add to my Ha. I have now compiled a HOO image consisting of:-

Red = Ha. Green = Oiii * 80% + Ha * 20%. Blue Oiii * 85% + Ha * 15%

Steve

[Demonperformer]

Lovely detail there, Steve. How long on each filter? The thing that struck me first was the dark nebula on the right (the very black patch rather than the big area in the corner).

[sloz1664]

Hi DP

18 x 20 min Ha + 15 x 20 min Oiii.

Yes the dark nebula is quite striking I think. When I initially calibrated the subs my first impression was something wasn't right. But on stacking and stretching the image the dark nebula was revealed.

Steve

[iansmith]

Excellent image. 

[groberts]

Nice image Steve.  I have some recent Ha & OIII data from the same object myself for processing and am wondering:

1. Why you chose this mix of Ha and OIII - not just why these %'s but why mix Ha and OIII for what I presume is ultimately an HOO image?  I'm presuming its to enhance detail in the OIII which is otherwise quite weak? 

On 18/02/2018 at 18:08, sloz1664 said:

Red = Ha. Green = Oiii * 80% + Ha * 20%. Blue Oiii * 85% + Ha * 15%

2. How do you create these separate mixes? I'm using Photoshop and thinking maybe you're creating separate Ha & OII layers, adjusting the Opacity to the required mix, then merging down?

Any help would be appreciated.

Thanks, Graham        

[sloz1664]

Hi Graham,

I'm a Pixinsight man and unfortunately not Photoshop. I'm sure one of the PS gurus will help you out

Steve

[groberts]

OK thanks Steve.

Any PS takers?