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Can I use the the 'rejection high' frame from my master dark integration for cosmetic correction ?

Ian Hudson
in PixInsight
Whilst updating my master dark / flat library I stretched a 'rejection_high' frame and wondered would that make a good cc frame ?

Maybe it would need to be binaraized

Ian

Comments

  • BlockHeadBlockHead
    Hmm... 
    No, it would not make a good CC frame... at least not in the way I suspect you mean.
    A rejection frame shows values from light (photons) that are likely to be spurious for a number of reasons. The reasons include everything from cosmic rays, to the seeing, satellite trails, bad tracking, focus... etc etc. 

    Cosmetic Correction identifies attributes of the sensor (pixels or groups of them) that should not be used for one reason or another- and we should trust the neighboring pixels for a better answer. Here the nature of the correction (instead of rejection) is different and the process itself is different. Rejection relies on the statistical fluctuations of values between *images* whereas cosmetic correction takes place between *pixels* of a single image. 

    These are really very different things.

    -the Blockhead
  • Ian Hudson
    Thank you, Adam, both for taking the time to answer and for providing a clear and understandable answer.  I really appreciate it.

    Ian


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