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NSG vs DBE

Alan Kubiak
in PixInsight
I may have an incorrect understanding of NSG and DBE but don't they both do generally the same thing??   I am using NSG mostly to take care of the small amount of gradient I have but I noticed Adam still using DBE in his processing videos.   Which one is preferred??  

Thank you.

Comments

  • BlockHeadBlockHead
    No. NSG (and Local Normalization) are normalization methods that *MATCH* image backgrounds (gradients) and signal strengths in order to make them compatible for rejection of outlying values. A consequence of this is that the reference frame you pick for normalization will be what is matched through all images. Thus, you can pick a frame that has the smallest/simplest gradients. There will be a gradient. DBE is therefore always used subsequently. I think you will agree that the simpler the gradient the easier it is for DBE to do its thing.

    Please see this explanation of Normalization:



    And of course review the videos on normalization/weighting here:

    -the Blockhead
  • Alan Kubiak
    Thank you for the explanation and outstanding videos.
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