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Cygnus Loop in Ha/RGB

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#1 jeff.bottman

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Posted 07 July 2020 - 06:29 PM

I've been working on expanding and improving my PixInsight skills.  This image combines 3 1/2 hours Ha and 1.2 hours RGB data.  I used the arcsinhStretch process to retain star colors in the RGB data, then StarNet to decompose into star / starless views.  Extracted the blue and green channels from starless, and channel-combined with the red channel from StarNet starless Ha data, yielding a nice starless nebula image.  Then used PixelMath to sum the colorful stars-only data with the composite nebula data.  Worked pretty well.

 

AstroTech AT65EDQ scope, modified Nikon D750 camera, guided iOptron SmartEQ+ mount.

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#2 wizbang396

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Posted 07 July 2020 - 07:40 PM

Looks pretty good.  



#3 james7ca

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Posted 07 July 2020 - 08:19 PM

That's a very nice image and thanks for posting.

 

But, I'm seeing a VERY slight red bias to some of the smaller background stars. It might just be the reproduction ratio and the JPEG compression, but in some areas the very smallest stars seen to be too warm in color (and I don't think I'm confusing the faint background nebula with the tiny stars).

 

When I have this kind of "look" I often apply a VERY mild color noise reduction using Photoshop and that pretty much neutralizes the red bias.

 

That said, the star color is generally very good and you've recorded a lot of the faintest nebulosity. A very fine image overall.



#4 SandyHouTex

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Posted 09 July 2020 - 08:45 AM

I've been working on expanding and improving my PixInsight skills.  This image combines 3 1/2 hours Ha and 1.2 hours RGB data.  I used the arcsinhStretch process to retain star colors in the RGB data, then StarNet to decompose into star / starless views.  Extracted the blue and green channels from starless, and channel-combined with the red channel from StarNet starless Ha data, yielding a nice starless nebula image.  Then used PixelMath to sum the colorful stars-only data with the composite nebula data.  Worked pretty well.

 

AstroTech AT65EDQ scope, modified Nikon D750 camera, guided iOptron SmartEQ+ mount.

Awesome.



#5 sunnyday

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Posted 09 July 2020 - 08:48 AM

absolutely wonderful, the colors, the details wow, bravo and thank you.



#6 Starman27

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Posted 09 July 2020 - 10:44 AM

I think your processing technique is successful. Keep up the good work.




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