APOD: In the Center of the Trifid Nebula (2013 Jan 28)
Re: APOD: In the Center of the Trifid Nebula (2013 Jan 28)
Luminance in this regard refers to "detail". The luminance or luminosity portion of an image provides the detail. The luminance can be an unfiltered set of exposures which is a common method among amateur astrophotographers however any narrowband or wideband (or combination thereof) set of data can be used as luminance in an image to provide detail. In this case I combined mostly 6565nm h-alpha data sets from the Subaru to provide luminance (detail) against Martin's mapped color image. In addition I layered Hubble data (narrowband SII, OIII, Ha) onto the image. I hope this clarifies the method I used to combine the data sources.
- DavidLeodis
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Re: APOD: In the Center of the Trifid Nebula (2013 Jan 28)
Thanks you Robert for your reply to my query about luminance. Your help is appreciated.robgendler wrote:Luminance in this regard refers to "detail". The luminance or luminosity portion of an image provides the detail. The luminance can be an unfiltered set of exposures which is a common method among amateur astrophotographers however any narrowband or wideband (or combination thereof) set of data can be used as luminance in an image to provide detail. In this case I combined mostly 6565nm h-alpha data sets from the Subaru to provide luminance (detail) against Martin's mapped color image. In addition I layered Hubble data (narrowband SII, OIII, Ha) onto the image. I hope this clarifies the method I used to combine the data sources.
![Smile :)](./images/smilies/icon_smile.gif)
Re: APOD: In the Center of the Trifid Nebula (2013 Jan 28)
Actually, when I initially saw this picture it reminded me of the Flux Capacitor from Back to the Future.
![Wink ;)](./images/smilies/icon_wink.gif)
![Wink ;)](./images/smilies/icon_wink.gif)