MR - Mirror image or volume

(06/28/07)

PURPOSE

Creates mirror-symmetry related output image/volume from input image/volume. The mirror axis lies at -- row number: NY/2+1, column: NX/2+1, or slice: NZ/2+1.   Example.

USAGE

.OPERATION: MR

.INPUT FILE: PIC001
[Enter name of file to be mirrored.]

.OUTPUT FILE: MIR001
[Enter name of file for mirrored image.]

If file contains an image, SPIDER asks:

.MIRROR X OR Y AXIS (DEFAULT=Y): Y
[Enter the mirror axis. X = interchange rows (top / bottom), Y = interchange columns (left / right).']

If file contains a volume, SPIDER asks:

.MIRROR X, Y, OR Z AXIS (DEFAULT=Y): Y
[Enter the mirror axis.
X = interchange rows (top / bottom),
Y = interchange columns (left / right),
Z = interchange slices (front / back).]

NOTES

  1. If you mirror around an even length axis then you will NOT get the same results that you expect from using Photoshop or most other imaging packages due to the difference in placement of the axis in SPIDER. E.g. when mirroring an even row length image using SPIDER, the first column's value is unchanged and the last column's value is taken from the original 2nd column. This is consistent with the image center defined in 'RT' and other SPIDER operations.

SUBROUTINES

MIRROR

CALLER

UTIL2

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