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superluminance questions

Alan
in PixInsight
Hi Adam

I've just been watching your latest video on how to construct a superluminance from the LRGB stacked frames and I have a couple of questions:

1. Can you use this technique to also include narrowband data that you may have also acquired ? Eg if you have some Ha data then you would create a superluminance from the LRGB + Ha. 

2. Since the aim of the superluminance is to improve SNR without reducing detail, how do you best guard against reducing the detail in the resultant image ? Eg could you use subframe selector to measure the individual stacked FWHMs and and perhaps use deconvolution on any stacks that have large FWHMs before superluminance creation ?

Alan  

Comments

  • BlockHeadBlockHead
    edited March 2020
    Regarding #2, yes absolutely. You would want to select only the best RGB data. As you saw in the video, if your Luminance already gives you good S/N and resolution... the addition of the RGB may not be overwhelming...but it is always a nice feeling to know you are using every photon you collected.I wouldn't apply decon to anything.... until after creating the final integrated result.

    With respect to #1... I am doubtful this would be helpful from an S/N point of view. Perhaps it depends...(perhaps Ha of the core of the Orion nebula would be nice)- but for faint objects (the majority) my gut says it wouldn't be terribly helpful.

    -the Blockhead
    P.S. Thank you for watching!! I will be putting up more recordings soon... 

  • jeffrey merrilljeffrey merrill
    Hi Adam:  I'm still confused about the rationale to use a super-luminance in this case.  In my mind I can understand adding Ha to luminance as Alan mentioned above to give the luminance added structures that might not be as evident with just luminance.  I also understand the rationale of creating a luminance from just R-G-B data aqcuisition.

    In the case of L-R-G-B frame acquisition...you ultimately combine Lum master with RGB master to make an LRGB final ...granted you're not using deconvolution on RGB, but aren't you getting contribution just by adding L and RGB?

     I'm not understanding how adding RGB to lum to make a superluminance helps vs. when you are doing the traditional approach and adding Lum and RGB masters together to create the final L-R-G-B master?

    jeff
  • BlockHeadBlockHead
    I think the point is, if I understand where this is going, when you use RGB to create an LRGB image by means of LRGBCombination- the S/N of the L is not affected (improved) by the process. When you mathematically add the R,G,B data into the L (not just a blend as color)- it may be possible to improve the S/N of your new Luminance image. 

    I think that is the main idea... though I could be entirely wrong!
    -the Blockhead
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