MA X - Mask - image in X direction

PURPOSE

Masks a specified image in X direction.

SEE ALSO

MA	[Mask - image using circular mask]
MA L	[Mask - line across image]
MA Y	[Mask - image in Y direction]
MA Z	[Mask - image in Z direction]
MM	[Mask Multiplication]

USAGE

.OPERATION: MA X

.INPUT FILE: H_PIC001
[Enter the name of the file to be masked.]

.OUTPUT FILE: H_IMG031
[Enter the name of the output file.]

.OUTER & INNER RADII: 12.0
[Enter the range of the mask, in pixels.]

.(D)isk, (C)osine, (G)aussian edge, or (T)rue Gaussian: D/C/G/T
[Enter 'D' for a sharp profile cutoff, (for 2D image only:)
'C' or 'G' for a piece-wise mask (no modification inside the mask range, and cosine/Gaussian-shaped falloff from this range outwards), or
'T' for a true Gaussian mask.]

.(A)V, (P)REC AV, (C)IRCUMF, OR (E)XTERNAL: P
[Enter 'A' if the background is to be the average of the picture before masking;
enter 'P' if the background is to be the average after masking;
or enter 'E' if the background is to be specified EXTERNALLY.
Enter 'C' if you want the background to be determined by averaging along the border of the mask].

If 'E' was entered, the following question appears:

.ENTER BACKGROUND: 3.0
[Enter the desired background.]

.MASK CENTER COOS (NSAM, NROW): 50, 15
[Enter the coordinates of the mask center. Note that you have to specify coordinates equal to NSAM/2+1, NROW/2+1 if you want the mask center to coincide with the nominal image center.]

The following question appears only when using a 3-D volume.

.MASK CENTER COOS (NSLICE): 45

[Enter the slice number for the mask center. Note that you have to specify slice equal to NSLICE/2+1 if you want the mask center to coincide with the nominal volume center.]

If a 'C' was specified in response to the '(C)osine, (D)isk or (G)aussian:' prompt, the following question appears]:

.WIDTH: 3.5
[Enter the width of the cosine falloff function.]

If a 'G' was specified in response to the '(C)osine, (D)isk or (G)aussian:' prompt, the following question appears]:

.HALFWIDTH: 3.5
[Enter the halfwidth of the Gaussian falloff function.]

SUBROUTINES

MASK

CALLER

UTIL2