The fors_remove_bias recipe
===============================================================

.. data:: fors_remove_bias

Synopsis
--------

Subtract bias from input frame

Description
-----------

This recipe is used to subtract the overscan and master bias(produced by the recipe fors_bias) from one raw data frame. The overscan regions, if present, are
used to compensate for variations of the overall bias level between master bias
and input raw frame. The overscan regions are then trimmed from the result.

The recipe should allow any fors frame.


Input files
^^^^^^^^^^^^
::

  DO category:               Type:       Explanation:         Required:
  ANY_CAT
                  Raw         Raw data frame          Y
  MASTER_BIAS                Calib       Master bias frame       Y

Output files
^^^^^^^^^^^^
::

  DO category:               Data type:  Explanation:
  ANY_CAT_UNBIAS             FITS image  Bias subtracted frame


Constructor
-----------

.. method:: cpl.Recipe("fors_remove_bias")
   :noindex:

   Create an object for the recipe fors_remove_bias.

::

   import cpl
   fors_remove_bias = cpl.Recipe("fors_remove_bias")



.. seealso:: `cpl.Recipe <https://packages.python.org/python-cpl/recipe.html>`_
   for more information about the recipe object.

Bug reports
-----------

Please report any problems to `Carlo Izzo <usd-help@eso.org>`_. Alternatively, you may 
send a report to the `ESO User Support Department <usd-help@eso.org>`_.

Copyright
---------

This file is currently part of the FORS Instrument Pipeline
Copyright (C) 2002-2011 European Southern Observatory

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA


.. codeauthor:: Carlo Izzo <usd-help@eso.org>
