[left top width height]
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.
This program is part of Netpbm.
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,
-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 pnm-
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
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.
-pad If the rectangle you specify is not entirely within the input
pnmcrop, pamdice, pamcomp, pnmpad, pnmcat, pgmslice,
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
The predecessor pnmcut was one of the oldest tools in the Netpbm pack-
Copyright (C) 1989 by Jef Poskanzer.
netpbm documentation 05 April 2005 Pamcut User Manual(0)