ccd : CCDData
Image from which dark will be subtracted
master : CCDData
dark_exposure : Quantity
Exposure time of the dark image; if specified, must also provided
data_exposure.
data_exposure : Quantity
Exposure time of the science image; if specified, must also provided
dark_exposure.
exposure_time : str or Keyword
Name of key in image metadata that contains exposure time.
exposure_unit : Unit
Unit of the exposure time if the value in the meta data does not
include a unit.
add_keyword : str, Keyword or dict-like, optional
Item(s) to add to metadata of result. Set to None to completely
disable logging. Default is to add a dictionary with a single item:
the key is the name of this function and the value is a string
containing the arguments the function was called with, except the
value of this argument.
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