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Item _em_micrographs.correction_type

Description

  The difference between the two is that in Phase only correction 
  only the phase of the CTF is flipped whereas in Phase and Amplitude 
  correction, Wiener filtering is done to correct both phase and 
  amplitude. If the envelope function and noise spectrum parameters 
  are not available then phase only correction is recommended. 
  For example if the parameters calculated from far from focus images 
  are used to correct near to focus images (after adjusting for the 
  defocus difference), the envelope function and noise spectrum 
  parameter estimates of far from focus images are not reliable for 
  near to focus images.  

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