Why the intensity value of DNG out of the range Matlab shows(blacklevel & whitelevel)?

Discussion in 'Graphics Programs and Photo Gallery' started by cghcw, Oct 24, 2017.

  1. cghcw

    cghcw TPF Noob!

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    When using Matlab to deal with a DNG picture,it shows that the BlackLevel and WhiteLevel is 2047 and 15000 respectively.

    But there still exists a weird phenomenon that the intensity values of some pixels are out of this range (2047-15000), such as 1997, 15297.

    Why???


     
  2. Dave442

    Dave442 No longer a newbie, moving up!

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    Unless you told it to clip at those two levels then it seems that the data can extend beyond. I would think this could be the case if the BlackLevel is not 0,0,0 in RGB.

    I had bought Matlab back in the 90's and never really used it, and long before I had a digital camera to think about doing things like this. Hope somebody else has more information.
     

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