.. index:: ! phasefilt            

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phasefilt         
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Synopsis
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**phasefilt** *-imag imag.grd -real real.grd [-alpha alpha][-psize size][-amp1 amp1.grd -amp2 amp2.grd][-diff][-v]*


Description
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**phasefilt** Applies Goldstein adaptive filter to phase [output: filtphase.grd] or applies modified Goldstein adaptive filter to phase [output: filtphase.grd, corrfilt.grd]

Required Arguments
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**-imag** *imag*        

	GMT format file of imaginary component

**-real** *real*        

	GMT format file of real component

Optional Arguments
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**-alpha** *alpha*       	

	Exponent for filter - usually between 0.0 and 1.5 (0.0 should not filter).
	
	default: 0.5	[Goldstein filter] (anything above 1.0 may be excessive)

		alpha < 0 will set alpha = (1 - coherence) [modified Goldstein]


**-psize** *psize*       	

	Patch size for filtering. Must be power of two. Default: 32

**-amp1** *amp1* 	      	

	GMT format file of amplitude image of image 1. Needed (and applies) modified filter.

**-amp2** *amp2* 	      	

	GMT format file of amplitude image of image 2. Needed (and applies) modified filter.

**-diff** *diff*         

	Calculate difference between input phase and output phase.

**-complex_out** *complex_out* 	

	Write out filtered real and imaginary (filtphase_real.grd and filtphase_imag.grd)

**-v**            

	Verbose.

**-debug**       	

	Debug.
             



Example
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 ::

    phasefilt -imag imag.grd -real real.grd -alpha 0.5