**PURPOSE**- Generates full, unscrambled phase spectrum from complex Fourier transform for 2-D images. Reads either a real image/volume or its Fourier transform. The resulting data are real and can be displayed as a normal image. Parallelized for OMP Jan 2018. Example.

**SEE ALSO****PW**[Power spectrum - Amplitudes of Fourier transform ||] **PW L**[Power spectrum - Log10 ||] **FT**[Fourier Transform ||] **RO SD**[Rotational average - single line output, doc file]

**USAGE**- .OPERATION: PW P

- .INPUT FILE: IMG001

[Enter name of the image/volume. Can be a real image/volume or its Fourier transform.].OUTPUT FILE: POW001

[Enter the name of the file where phase spectrum) is to be placed.]

**NOTES**

- The center of 2-D phase spectrum is placed in
(NX/2+1, NY/2+1);
The center of 3-D phase spectrum is placed in
(NX/2+1, NY/2+1, NZ/2+1).
- The term |F(0)| is replaced by term |F(1)| to facilitate visualization.

**SUBROUTINES**- PW2SR

**CALLER**- FOUR1 , FOUR1B

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