xmipp_ctf_enhance_psd (v3.0)


Enhances the visibility of the Thon rings in a Power Spectrum Density (PSD).

See also


-i, --input <input_file>
Metadata with PSDs or a single PSD
--mode <mode=overwrite>
Metadata writing mode.
where <mode> can be:
  • overwrite Replace the content of the file with the Metadata
  • append Write the Metadata as a new block, removing the old one
-o, --output <output_file=>
Output file: metadata, stack, volume or image.
--oroot <root=>
Rootname of output individual images. Output image format can be set adding extension after rootname as ":ext".
--method <mth=filter>
Choose enhancing method
where <mth> can be:
  • filter <freq_low=0.05> <freq_high=0.2> <freq_decay=0.02> Ad hoc filters. The algorithm is fully described at this article The frequency limits define a raised-cosine bandpass filter, frequencies are normalized to 0.5
  • spht <N0=1> <NF=10> Spiral phase transform normalization. N0 and NF define the minimum and maximum number of fringes in the CTF

Output parameters

By default, the output is centered
Don't take log10 before working

Output mask parameters

--m1 <freq_low=0.025>
Low freq. for frequency mask, max 0.5
--m2 <freq_high=0.3>
High freq. for frequency mask, max 0.5

Examples and notes

xmipp_ctf_enhance_psd -i myPSD.psd -o myPSD_enhanced.psd

User's comments


  • Raw PSD:

  • Enhanced PSD: