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Pamsummcol User Manual(0) Pamsummcol User Manual(0)
NAME
pamsummcol - summarize (sum, average, etc) a Netpbm image by column
SYNOPSIS
pamsummcol { -sum | -mean | -min | -max } [imagefile]
All options can be abbreviated to their shortest unique prefix. You may use two hyphens
instead of one. You may separate an option name and its value with white space instead of
an equals sign.
DESCRIPTION
This program is part of Netpbm(1).
pamsummcol reads a Netpbm image (PNM or PAM) and performs a summary function over all the
rows in each column (sum, mean, etc.). It produces an image of the same kind that the
same width and depth as the input, and one row high. Its sample values are the result of
the summary.
pamsummcol performs the summary operation on each plane independently.
pamsummcol performs the operation on the actual sample values, not on the light intensi-
ties represented by them in the case that the image is a PGM or PPM image.
If you want to summarize by row instead of by column, run the input through pamflip first
(and if you want the output to be a single column instead of a single row, use pamflip
again).
If you want to summarize over the entire image (getting a one-tuple output image), use
pamsumm to get a summary row, pamflip to turn that into a column, the pamsumm again to
summarize the column.
If you want to summarize the individual samples in an entire image, instead of by tuple,
use pamsumm.
pamsummcol performs the operation on the actual sample values, not on the light intensi-
ties represented by them in the case that the image is a PGM or PPM image or PAM equiva-
lent. You can use pnmgamma to convert such an image to one with samples proportional to
light intensity, and then use pamsummcol on the result.
You can achieve the same thing as pamsummcol -mean with pamscale. Just scale vertically
to a single row, without scaling horizontally at all. Use the pixel mixing method.
OPTIONS
You must specify exactly one of -sum, -mean, -min, or -max.
-sum
This option makes the summary function addition.
In each column and plane of the output row, the sample value is the
sum of all the samples values in the same column and plane of the input.
If a result is greater than the image maxval, it is clipped to
the maxval.
-mean
This option makes the summary function arithmetic mean.
In each column and plane of the output row, the sample value is the
mean of all the samples values in the same column and plane of the input.
-min
This option makes the summary function arithmetic minimum.
In each column and plane of the output row, the sample value is the
minimum of all the samples values in the same column and plane of
the input.
-max
This option makes the summary function arithmetic maximum.
In each column and plane of the output row, the sample value is
the maximum of all the samples values in the same column and
plane of the input.
SEE ALSO
pamsumm(1), pamflip(1), pamfunc(1), pamarith(1), pamscale(1), pam(1),
HISTORY
pamsummcol was added to Netpbm in Release 10.21 (March 2004).
DOCUMENT SOURCE
This manual page was generated by the Netpbm tool 'makeman' from HTML source. The master
documentation is at
http://netpbm.sourceforge.net/doc/pamsummcol.html
netpbm documentation 25 January 2009 Pamsummcol User Manual(0)
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