RT 90 - RoTate - image or volume, by 90, 180, or 270 degrees

PURPOSE

To rotate an image 90, 180, or 270 about Z axis or rotate a 3-D volume 90, 180, or 270 degrees about either the X, Y, or Z axis. This operation is NOT compatible with any other SPIDER "RT" operations since it does NOT use the standard SPIDER convention for the rotation center used in the other "RT" operations. Instead it does "rotation" by interchanging columns and rows / or slices.

SEE ALSO

RT	[RoTate - image or volume, use average as background]
RT 3	[RoTate - volume, slow]
RT 3A	[RoTate - volume, arbitrary center, quadratic interpolation]
RT 3D	[RoTate - volume, fast, quadratic interpolation]
RT B	[RoTate - image or volume, supply Background]
RT C	[RoTate - image, around arbitrary center, for small files]
RT M	[RoTate - image or volume, use minimum as background]
RT SQ	[Rotate and Shift - image, Quadratic interpolation ||]

USAGE

.OPERATION: RT 90

.INPUT FILE: IMG000
[Enter the name of the file to be rotated.]

.OUTPUT FILE: OUT000
[Enter the name of the file where the rotated volume is to be kept.]

FOLLOWING THREE QUESTIONS REFER TO ORIGINAL VOLUME DIMENSIONS.

.ENTER FIRST AND LAST X COLUMN NUMBER (OR <CR> FOR ALL): <CR>

.ENTER FIRST AND LAST Y ROW NUMBER (OR <CR> FOR ALL): 1,50

.ENTER FIRST AND LAST Z SLICE NUMBER (OR <CR> FOR ALL): <CR>

.ENTER ROTATION AXIS (X,Y,Z) (<CR> IS Z): X
[Uses a right-handed coordinate system.]

.ENTER ROTATION ANGLE (90,180, OR 270): 90
[All rotations are clockwise when looking along axis facing greater values. X axis points to right, Y axis points down screen, and Z axis is coming out of the screen.]

NOTES

1. The time required will depend on the axis and angle.

2. Any aspect ratio of image or volume is allowed (the volume does not have to be padded to a cube).

3. The maximum size of image or volume which can be rotated depends upon the axis and angle. The smallest size limit is for rotations arond Y or Z axis by 90 or 270 degrees. These rotations are limited to an output slice of (MAXDIM - 16000) pixels.

SUBROUTINES

REFORM0, REFORM

CALLER

UTIL3