PixInsight Forum

PixInsight => Gallery => Topic started by: RickS on 2016 September 16 03:18:02

Title: IC1396 in HaOiiiSiiRGB
Post by: RickS on 2016 September 16 03:18:02
The Elephant Trunk in a mixed NB/RGB palette.  Captured at SRO, Jul - Aug, 2016

Scope: Ceravolo C300 @ f/4.9 = 1470mm FL
Mount: AP1100
Camera: FLI PL16803
Focuser: Atlas
Filters: Astrodon
Guiding: Lodestar II / Tak guide scope
Image scale: 1.26 arcsec/pixel
Exposures: 23x300s R, 24x300s G, 23x300s B, 25x1800s Ha, 28x1800s Oiii, 27x1800s Sii (~46 hours)
Processing: PixInsight 1.8

Acquisition credit: Bret Charles, Scott Johnson, John Kasianowicz, Daniele Malleo, Jose Mtanous and Rick Stevenson
Processing credit: Rick Stevenson

(http://astrob.in/264155/rawthumb/gallery/get.jpg) (http://astrob.in/264155/)
Title: Re: IC1396 in HaOiiiSiiRGB
Post by: AstroScience on 2016 September 16 03:33:38
Incredible image Rick, have no other words to add, simply amazing, love the colors and smoothness!
Great job!
Title: Re: IC1396 in HaOiiiSiiRGB
Post by: RickS on 2016 September 16 03:51:25
Very kind of you, Sergio!
Title: Re: IC1396 in HaOiiiSiiRGB
Post by: Zocky on 2016 September 16 11:45:08
Excellent image Rick. I love the details and subtle colors.
Title: Re: IC1396 in HaOiiiSiiRGB
Post by: RickS on 2016 September 16 14:54:49
Thanks, Zoran!
Title: Re: IC1396 in HaOiiiSiiRGB
Post by: ajbarr on 2016 September 16 19:20:02
Amazing image Rick. Can you explain how you mixed the filters?

Albert
Title: Re: IC1396 in HaOiiiSiiRGB
Post by: RickS on 2016 September 16 22:14:34
Amazing image Rick. Can you explain how you mixed the filters?

Thanks, Albert.

I created a Hubble Palette tone map (remove stars from Ha, Oiii, Sii linear masters; LinearFit Oiii and Sii to match Ha; LRGBCombine S=R, H=G, O=B) and a conventional RGB with stars (LRGBCombine, BackgroundNeutralization, ColorCalibration) then I blended the two images with PixelMath ("a*NB+b*RGB" where a+b=1.  I can't remember what the final values were but I would have started with a=0.5 and b=0.5 and tweaked them until I was happy.)  After that I processed the blended colour image as normal (denoise, HT stretch, etc. and finally combine with a synthetic luminance derived from a noise weighted integration of the NB and colour masters.)

This wasn't my original plan.  Combining the NB and RGB colour was an experiment that just happened to produce a result I really liked.

Cheers,
Rick.
Title: Re: IC1396 in HaOiiiSiiRGB
Post by: Astrodoc on 2016 September 22 09:52:08
Beautiful rendition. Stars look very natural.
Title: Re: IC1396 in HaOiiiSiiRGB
Post by: RickS on 2016 September 22 13:56:53
Thanks, Ron.
Title: Re: IC1396 in HaOiiiSiiRGB
Post by: edif300 on 2016 October 07 15:41:06
Nicely done, noiseless, great colors, wonderful stars and with good resolution. Like it !!  8)