One Bad Column

Discussion in 'Image Processing' started by Brian McGaffney, Nov 21, 2016.

  1. Brian McGaffney

    Brian McGaffney Standard User

    Aug 31, 2015
    I have just run an processed darks and bias frames over the full gamut for a new CCD camera. About 2 weeks after, the CCD developed one bad column pretty much in the centre.
    I dont want to redo all the darks and bias frames I just did or subtract the bad pixel map manually from light frame image, so is there any way of subtracting the saved bad pixel map during the MaxIm stack operation? Or do I have to have a script written.
  2. Doug

    Doug Staff Member

    Sep 25, 2014
    CCD sensors slowly accumulate damage from ionizing radiation. Much of that comes from space (it's worse at higher elevations - less protective atmosphere). There will also be some contribution from local building materials etc.

    The best solution is to run a new set of darks; it is highly likely to completely correct the column. If that isn't sufficient, you can configure Set Calibration to apply a Bad Pixel Map at the same time it does the dark subtraction. But personally I'd redo the dark frames first.

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