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pnmcut
!!!pnmcut
NAME
SYNOPSIS
DESCRIPTION
OPTIONS
SEE ALSO
AUTHOR
----
!!NAME


pnmcut - cut a rectangle out of a PBM, PGM, or PPM image
!!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__ also adds borders to an image, but you specify
their width directly.


__-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.
----
11 pages link to pnmcut(1):
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Last edited on Tuesday, June 4, 2002 12:22:43 am by "perry"
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