Level 2 Help for FFTPIC

This specifies the input image, plus 1 or 2 intermediate (scratch) 
datasets used during the processing.  The scratch datasets may be 
specified as input files or as output files. (But not both.) The
scratch files are always created by the program, hence do not need
to be pre-allocated by the user.

In TRANSFORM mode, the primary input is assumed to be a complex
Fourier-transform image in the format produced by program FFT22.
In CPIC mode, the primary input may be any complex image 
(or a real image with even number of samples).
 
The sizes of the intermediate files will be equal to the input in samples,
but will of format REAL.
 
If the keyword 'CPIC' has been specified, then only one scratch file is 
required.  Two scratch files are required for TRANSFORM mode.

This specifies the output image, plus 1 or 2 intermediate (scratch) 
datasets used during the processing.  The scratch datasets may be 
specified as input files or as output files. (But not both.)
 
The size of the primary output will be depend on MODE: in TRANSFORM mode
it will be larger than the input in samples by 1 (if L_DISP is the same
as R_DISP) or 2 (if L_DISP and R_DISP are different) samples;  in CPIC
mode it will have the same number of samples.  In all cases, the format 
will be BYTE and the number of lines will be that of the primary input.
 
The sizes of the intermediate files will be equal to the input in samples,
but will of format REAL.
 
If the keyword 'CPIC' has been specified, then only one scratch file is
required.

This parameter has two valid keyword values: LINEAR and LOG.
 
LINEAR specifies linear scaling of the display information selected.
This is the default.
  
LOG specifies logarithmic (base 10) scaling of the display information
selected. This modifier applies only to non-phase portions of the requested
displays. 

This parameter has 7 valid keyword values: L_AMPL, L_PHASE, L_COSINE, L_SINE,
L_INTENS, L_REAL, L_IMAG.  It specifies the information displayed in the
left half of the primary output for TRANSFORM mode, or for the entire
output for Complex Picture (CPIC) mode.
 
  L_AMPL displays amplitude information. This is the default.
  L_PHASE displays phase information without sign.
  L_COSINE displays real-part information. Same as L_REAL.
  L_SINE displays imaginary-part information. Same as L_IMAG.
  L_INTENS displays intensity (squared amplitude) information.
  L_REAL displays real-part information. Same as L_COSINE.
  L_IMAG displays imaginary-part information. Same as L_SINE.

This parameter has 7 valid keyword values: R_AMPL, R_PHASE, R_COSINE, R_SINE,
R_INTENS, R_REAL, R_IMAG.  It specifies the information displayed in the
right half of the primary output for TRANSFORM mode ONLY.
 
This parameter is ignored for Complex Picture (CPIC) mode.
 
  R_AMPL displays amplitude information. This is the default.
  R_PHASE displays phase information without sign.
  R_COSINE displays real-part information. Same as R_REAL.
  R_SINE displays imaginary-part information. Same as R_IMAG.
  R_INTENS displays intensity (squared amplitude) information.
  R_REAL displays real-part information. Same as R_COSINE.
  R_IMAG displays imaginary-part information. Same as R_SINE.

ORIGIN = (X,Y), where X and Y are floating point numbers specifying the 
sample and line coordinates of the requested phase origin location.
NOTE: (1,1) is the upper left hand corner. 
Default = (1,1)

NMIN is a floating point number specifying the fraction of non-phase 
information portions of the display which will be saturated to black (0). 
Default = 0.1 (10 percent)

NMAX is a floating point number specifying the fraction of non-phase 
information portions of the  display which will be saturated to 
white (255). 
Default = 0.1 (10 percent)

SIGN specifies that the sign of the angle (-P<ANGLE<=P, where the value
of PI is to be preserved in scaling phase information for display. The
specification of SIGN applies to both left and right halves of the 'transform'
display if two display types are called for. Default is suppression of SIGN
information in the phase angle displays).

THRESHOL=R4 where R4 is a floating point number specifying a threshold used to
scale display information prior to clipping results less than 1.0 in absolute
value. Default is 1.0.