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New Video in Horizons; Interpretation of NSG outputs

Roger Smith
in PixInsight
Hi Adam,
This is a great video! Your NGC6888 re-processing with NSG script for weighting proves the NSG script gives a superior result vs your previous best effort with the same data.  

Of particular interest to me were the different methods you used to quantitatively compare the quality differences, in addition to visual blinking:
--- Statistics (MAD and Std Dev).
--- SNR script.
--- Dynamic PSF on some stars.

For visually comparing 2 images should the same stretch be applied to each to expose the brighter image? 

Thanks for the video, and in depth explanations.

Roger



Comments

  • BlockHeadBlockHead
    Yes, the same stretch as being the "auto" stretch...which will accomplish this based on the histograms of the images. 

    As I noted, there is little change in the "noise" component of the images- but I think this makes sense- we aren't actually adding more images... the noise component should be the same save some small differences.

    Thanks for watching it. 

    -the Blockhead
  • Roger Smith
    You are doing the hard work to make the videos, not me. So Thanks to you!

    I was thinking to do the STF auto stretch on the first image, then drag this first STF to the second image without re-auto stretching.
       Roger 
  • BlockHeadBlockHead
    There will be real differences between the images. NSG is matching a particular frame- and then DBE (if used as I did) will add more differences. So to assert a precise match on the STF likely isn't warranted.
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