RE: Bad pixel determination?

[<aah@nofs.navy.mil>]

Rob Creager should look at the TN's if he
hasn't already; I think Michael did a check of the
dark current when Mark IV images first started
being available.  There should be some ideas in
there as to which pixels to use and how to set
the bins for the histogram.
  Tom is running the ADC in two's complement
mode, so the numbers really do run from -32768 to 32767,
and not 0-65535.  Be sure you are doing the conversion right.
  You should use two images for checking for bad pixels.
The dark current image tells you whether a given pixel
has a strange dark current.  A flatfield (say, twilight image)
will tell you about the response to light, identifying
those pixels with no response or abnormal response.
Arne