Pamcut User Manual(0)					 Pamcut User Manual(0)



NAME
       pamcut - cut a rectangle out of a PAM, PBM, PGM, or PPM image


SYNOPSIS
       pamcut

       [-left colnum]

       [-right colnum]

       [-top rownum]

       [-bottom rownum]

       [-width cols]

       [-height rows]

       [-pad]

       [-verbose]

       [left top width height]

       [pnmfile]

       Minimum	unique	abbreviations  of  option are acceptable.  You may use
       double hyphens instead of single hyphen to denote options.  You may use
       white space in place of the equals sign to separate an option name from
       its value.


DESCRIPTION
       This program is part of Netpbm(1).

       pamcut reads a PAM, PBM, PGM, or PPM image as input  and	 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.

       In  any	case,  remember that you are specifying the rectangle to keep,
       not the bits to discard.	 Otherwise, you'll be tempted to believe  that
       -right=9	 means	to  delete  the 9 rightmost columns.  (It really means
       keep the stuff up to Column 9 and delete the rest).

       To use options, just code any mixture of the -left, -right, -top, -bot-
       tom,  -width,  and  -height  options.  What you don't specify defaults.
       Those defaults are in favor of minimal cutting and in favor of  cutting
       the right and bottom edges off.	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  pnm-
       file.

       Output is to Standard Output.

       pamcut works on a multi-image stream.  It cuts each image in the stream
       independently and produces a multi-image stream output.	Before	Netpbm
       10.32 (March 2006), it ignored all but the first image in the stream.

       If  you	are  splitting	a single image into multiple same-size images,
       pamdice is faster and easier than running pamcut multiple times.

       pamcomp is also useful for cutting and padding an image	to  a  certain
       size.   You  create  a background image of the desired frame dimensions
       and overlay the subject image on it.


OPTIONS
       -left=colnum
	      The column number of the leftmost column to be  in  the  output.
	      Columns  left  of this get cut out.  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.

	      To delete N columns at the left edge, specify -left=N.

	      To delete N columns at the right edge, specify -left=--(N+1).


       -right=colnum
	      The column number of the rightmost column to be in  the  output,
	      numbered	the  same  as for -left.  Columns to the right of this
	      get cut out.


       -top=rownum
	      The row number of the topmost row to be  in  the	output.	  Rows
	      above  this  get	cut out.  If a nonnegative number it refers to
	      rows numbered from 0 at the top, increasing downward.  If	 nega-
	      tive, it refers to columns numbered -1 at the bottom, decreasing
	      upward.

	      To delete N rows at the top, specify -top=N.

	      To delete N rows at the bottom, specify -bottom=-(N+1).


       -bottom=rownum
	      The row number of the bottom-most row to be in the output,  num-
	      bered the same as for -top.  Rows below this get cut out.


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


       -height=rows
	      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, pamcut 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  also  adds  borders  to  an image, but you specify their
	      width directly.

	      pamcomp does a more general form	of  this  padding.   Create  a
	      background image of the frame dimensions and overlay the subject
	      image on it.  You can use options to have the subject  image  in
	      the center of the frame or against any edge and make the padding
	      any color (the padding color is  the  color  of  the  background
	      image).


       -verbose
	      Print information about the processing to Standard Error.



SEE ALSO
       pnmcrop(1),  pamdice(1), pamcomp(1), pnmpad(1), pnmcat(1), pgmslice(1),
       pnm(1)


HISTORY
       pamcut was derived from pnmcut in Netpbm 9.20 (May 2001).  It  was  the
       first  Netpbm  program  adapted	to  the new PAM format and programming
       library.

       The predecessor pnmcut was one of the oldest tools in the Netpbm	 pack-
       age.



AUTHOR
       Copyright (C) 1989 by Jef Poskanzer.



netpbm documentation		 05 April 2005		 Pamcut User Manual(0)