Author Topic: Combining Narrow Band with Luminance  (Read 473 times)

Offline Radar

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Combining Narrow Band with Luminance
« on: 2017 May 01 19:21:19 »
Hi,

I'm trying to combine a fits image which is Ha, SII and OIII (which is already registered and combined) to a luminance channel. I can't find a process that lets me combine these two images (I can only find processes that let me combine all individual frames, but not a feature that lets me combine an RGB image (which is already combined) with a L channel). What's the best way to do this please?

Thanks in advance.


Ray
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Offline aworonow

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Re: Combining Narrow Band with Luminance
« Reply #1 on: 2017 May 01 20:46:52 »
Ray,
  Undoubtedly, several alternatives exist. What I would probably start with is assigning the NB to a palette (of your own liking or the Hubble palette, or whichever) and combining the NB accordingly. The resulting color image is processed, stretched and processed some more (as with any RGB image). Then the L image is processed, also including stretching, and combined with the RGB using the LRGB tool.
  Just a starting point. But, all is fair in the realm of image processing!

Alex

Offline jshortt

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Re: Combining Narrow Band with Luminance
« Reply #2 on: 2017 May 01 21:02:35 »
Not sure about narrowband but here are the steps that I follow to apply a Luminance to my RGB images:

With both L and RGB images open: open LRGBCombination, select the Luminance view, leave the RGB views unchecked, drag the LRGBCombination new instance icon (triangle) on to the RGB image

Presto!

John

Offline Radar

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Re: Combining Narrow Band with Luminance
« Reply #3 on: 2017 May 02 03:19:18 »
Thanks guys. What is the best way to register (align) them before using the LRGB combination tool please?

Regards

Ray
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Offline RickS

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Re: Combining Narrow Band with Luminance
« Reply #4 on: 2017 May 02 05:40:34 »
Thanks guys. What is the best way to register (align) them before using the LRGB combination tool please?

StarAlignment.  Ideally, you'll register all the subs to a common reference before you start stacking the masters.  You can do it after stacking but that means you're doing interpolation twice which will have some (probably small) impact on quality.

Offline Radar

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Re: Combining Narrow Band with Luminance
« Reply #5 on: 2017 May 02 16:23:13 »
Thank you gentlemen.

Ray
www.TheCosmicArtGallery.com
www.MyAstroSpace.com
C14, AstroPhysics 1600GTO, Coronado SolarMax90 DSII BF30, Sirius Dome.