.TH pnmflip 1 "25 July 1989"
.IX pnmflip
.SH NAME
pnmflip - perform one or more flip operations on a portable anymap
.SH SYNOPSIS
.B pnmflip
.RB [ -leftright | -lr ]
.RB [ -topbottom | -tb ]
.RB [ -transpose | -xy ]
.RB [ -rotate90 | -r90 | -ccw
.RB ]
.RB [ -rotate270 | -r270 | -cw
.RB ]
.RB [ -rotate180 | -r180 ]
.RI [ pnmfile ]
.SH DESCRIPTION
Reads a portable anymap as input.
Performs one or more flip operations, in the order specified, and
writes out a portable anymap.
.IX rotation
.IX reflection
.IX transposition
.SH OPTIONS
.PP
The flip operations available are: left for right
.RB ( -leftright
or
.BR -lr );
top for bottom
.RB ( -topbottom
or
.BR -tb );
and transposition
.RB ( -transpose
or
.BR -xy ).
In addition, some canned concatenations are available:
.B -rotate90
or
.B -ccw
is equivalent to
.B -transpose
.BR -topbottom ;
.B -rotate270
or
.B -cw
is equivalent to
.B -transpose
.BR -leftright ;
and
.B -rotate180
is equivalent to
.B -leftright
.BR -topbottom .
.PP
All flags can be abbreviated to their shortest unique prefix.
.SH "SEE ALSO"
pnmrotate(1), pnm(5)
.SH AUTHOR
Copyright (C) 1989 by Jef Poskanzer.
.\" Permission to use, copy, modify, and distribute this software and its
.\" documentation for any purpose and without fee is hereby granted, provided
.\" that the above copyright notice appear in all copies and that both that
.\" copyright notice and this permission notice appear in supporting
.\" documentation.  This software is provided "as is" without express or
.\" implied warranty.