• EMAN2
• Tutorials
• ri2ap

Changing image format from real/imaginary to amplitude/phase format in EMAN2 is a straightforward procedure. To illustrate the process start with a test image and perform an inplace Fourier transform on it:

[someone@localhost]$ e2.py

Welcome to EMAN2
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Enter '?' for ipython help

In [3]:  e = EMData(32,32,32)

In [4]:  e.process_inplace("testimage.axes")

In [5]:  e.do_fft_inplace()

You now have an EMData object (e) in real/imaginary format. To convert the image to amplitude/phase format simply do the following

In [6]:  e.ri2ap()

In [7]:  e.get(2,0,0)
Out[7]:  62.0

In [8]:  e.get(3,0,0)
Out[8]:  3.1415927410125732