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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 dis-
       card.  Otherwise, you'll be tempted to believe that -right=9 means to delete the 9  right-
       most 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, -bottom, -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 over-
       specify, 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.

       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 negative, 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, numbered 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 pad-
	      ding 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 package.

AUTHOR
       Copyright (C) 1989 by Jef Poskanzer.

netpbm documentation			  05 April 2005 		    Pamcut User Manual(0)
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