subtract_dark

ccdproc.subtract_dark(ccd, master, dark_exposure=None, data_exposure=None, exposure_time=None, exposure_unit=None, scale=False, add_keyword=True)[source]

Subtract dark current from an image.

Parameters:

ccd : CCDData

Image from which dark will be subtracted

master : CCDData

Dark image

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.

scale: boolean

If True, scale the dark frame by the exposure times

add_keyword : str, Keyword or dict-like, optional

Item(s) to add to metadata of result. Set to False or 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.
Returns:

result : CCDData

Dark-subtracted image