xenial (1) pnmcut.1.gz

NAME

       pnmcut - cut a rectangle out of a portable anymap

SYNOPSIS

       pnmcut  [-left  leftcol]  [-right  rightcol]  [-top  toprow]  [-bottom bottomrow] [-width width] [-height
       height] [-pad] [-verbose] [ left top width height ] [pnmfile]

       All options may be abbreviated to the shortest unique prefix.

DESCRIPTION

       Reads a PBM, PGM, or PPM image as input.  Extracts the specified rectangle, and produces the same kind of
       image as output.

       There  are  two  ways  to  specify  the  rectangle  to cut: arguments and options.  Options are easier to
       remember and read, more expressive, and allow you to use defaults.  Arguments were the only way available
       before July 2000.

       If you use both options and arguments, the two specifications get mixed in an unspecified way.

       To  use  options, just code any mixture of the -left, -right, -top, -bottom, -width, and -height options.
       What you don't specify defaults.  It is an error to overspecify, i.e. to  specify  all  three  of  -left,
       -right, and -width or -top, -bottom, and -height.

       To  use arguments, specify all four of the left, top, width, and height arguments.  left and top have the
       same effect as specifying them as the argument of a -left or -top option, respectively.  width and height
       have  the  same  effect  as  specifying them as the argument of a -width or -height option, respectively,
       where they are positive.  Where they are not positive, they have the same effect as specifying  one  less
       than  the  value as the argument to a -right or -bottom option, respectively.  (E.g.  width = 0 makes the
       cut go all the way to the right edge).  Before July 2000, negative numbers were not allowed for width and
       height.

       Input is from Standard Input if you don't specify the input file pnmfile.

       Output is to Standard Output.

OPTIONS

       -left  The  column number of the leftmost column to be in the output.  If a nonnegative number, it refers
              to columns numbered from 0 at the left, increasing to  the  right.   If  negative,  it  refers  to
              columns numbered -1 at the right, decreasing to the left.

       -right The column number of the rightmost column to be in the output, numbered the same as for -left.

       -top   The  row number of the topmost row to be in the output.  If a nonnegative number it refers to rows
              numbered from 0 at the top, increasing downward.  If negative, it refers to columns numbered -1 at
              the bottom, decreasing upward.

       -bottom
              The row number of the bottom-most row to be in the output, numbered the same as for -top.

       -width The number of columns to be in the output.  Must be positive.

       -height
              The number of rows to be in the output.  Must be positive.

       -pad   If  the rectangle you specify is not entirely within the input image, pnmcut fails unless you also
              specify -pad.  In that case, it pads the output with black up to the edges you specify.   You  can
              use  this option if you need to have an image of certain dimensions and have an image of arbitrary
              dimensions.

              pnmpad can also fill an image out to a specified dimension, and gives you  more  explicit  control
              over the padding.

       -verbose
              Print information about the processing to Standard Error.

SEE ALSO

       pnmcrop(1), pnmpad(1), pnmcat(1), pgmslice(1), pnm(5)

AUTHOR

       Copyright (C) 1989 by Jef Poskanzer.

                                                  29 June 2000                                         pnmcut(1)