NAME
rotate - rotates an image
SYNOPSIS
rotate file [pa=] [left] [right] [ud] [fill=] [outfile=]
DESCRIPTION
Rotates each pixel value in the given file by the position angle specified
(in degrees) by the pa parameter. Any pixels shifted out of the image
are discarded, and vacated pixels are set to zero or the value set by the
fill keyword. The program uses a bilinear interpolation
algorithm.
If the left, right, or ud (up/down) keywords are
specified, the image rotated by pixel rebinning. The orientation refers an
image whose row and column origin is at the upper left hand
corner.
The rotated image overwrites the image by default unless the outfile option
is
specified.
EXAMPLE
rotate m13 pa=2.34 fill=sky - rotates the
file m13.fts by 2.34 degrees
filling vacated pixels with the value from determined by the last
sky
command.
rotate MayIUlf left
- rotates the file MyaIUlf.fts by ninety degrees.
SEE ALSO
imshift
flip
BUGS
Nothing is done to the header to indicate that the image has been rotated.
The outfile option does not copy the header at
all.