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PCC and DBE

Ian Smith
in PixInsight
Hello Adam,

I've been viewing some of your cosmic canvas PI video (they're great by the way, thanks for doing them) and I have noticed that you tend to do PCC before DBE. I would have thought it would work better the other way round as then PCC would have a better background to work with. I'm sure I'm missing something, please could you explain the reasoning for your approach?

Cheers,
Ian

Comments

  • BlockHeadBlockHead
    The basic logic is that you can create gradients with DBE. How do you know you have not done so? 
    You cannot create a gradient with PCC. 
    However, it is possible to perhaps (and this really still needs to be shown to me in a dramatic way)- it is possible to affect the color balance that PCC tries to achieve with a *strong* initial gradient. 

    So... I think the fairest way to proceed is:

    1. Does your data have a *strong* gradient? It simply needs to be terrible. If so... use DBE first.
    2. If the data is "normal" and not silly terrible- PCC first seems best. PCC uses the stars in the image to get the weights (the color balance). If the stars are brighter than the gradient, it should not be a problem or a sufficiently large error. 

    Thus it is possible to make a larger error with DBE first than PCC first. That is my logic. 
    Juan did not entirely shoot my argument down. It has validity. 

    -the Blockhead
  • Ian Smith
    OK, I see the logic. Thanks for the explanation. 

    Cheers,
    Ian
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