Pamcut User Manual(0) Pamcut User Manual(0)
pamcut - cut a rectangle out of a PAM, PBM, PGM, or PPM image
[left top width height]
Minimum unique abbreviation of option is acceptable. You may use dou-
ble 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
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.
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
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
Input is from Standard Input if you don’t specify the input file pnm-
Output is to Standard Output.
If you are splitting a single image into multiple same-size images,
pamdice is faster 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.
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.
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.
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
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.
The number of columns to be in the output. Must be positive.
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
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
Print information about the processing to Standard Error.
pnmcrop(1), pamcomp(1), pnmpad(1), pnmcat(1), pgmslice(1), pnm(1)
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)
Man(1) output converted with