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+\
+.\" This man page was generated by the Netpbm tool 'makeman' from HTML source.
+.\" Do not hand-hack it! If you have bug fixes or improvements, please find
+.\" the corresponding HTML page on the Netpbm website, generate a patch
+.\" against that, and send it to the Netpbm maintainer.
+.TH "Pamsummcol User Manual" 0 "25 January 2009" "netpbm documentation"
+
+.SH NAME
+pamsummcol - summarize (sum, average, etc) a Netpbm image by column
+
+.UN synopsis
+.SH SYNOPSIS
+\fBpamsummcol\fP
+{
+\fB-sum\fP |
+\fB-mean\fP |
+\fB-min\fP |
+\fB-max\fP
+}
+[\fIimagefile\fP]
+.PP
+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.
+
+.UN description
+.SH DESCRIPTION
+.PP
+This program is part of
+.BR "Netpbm" (1)\c
+\&.
+.PP
+\fBpamsummcol\fP 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.
+.PP
+\fBpamsummcol\fP performs the summary operation on each plane
+independently.
+.PP
+\fBpamsummcol\fP performs the operation on the actual sample values,
+not on the light intensities represented by them in the case that the
+image is a PGM or PPM image.
+.PP
+If you want to summarize by row instead of by column, run the input
+through \fBpamflip\fP first (and if you want the output to be a single
+column instead of a single row, use \fBpamflip\fP again).
+.PP
+If you want to summarize over the entire image (getting a one-tuple
+output image), use \fBpamsumm\fP to get a summary row, \fBpamflip\fP
+to turn that into a column, the \fBpamsumm\fP again to summarize the
+column.
+.PP
+If you want to summarize the individual samples in an entire image,
+instead of by tuple, use \fBpamsumm\fP.
+.PP
+\fBpamsummcol\fP performs the operation on the actual sample values,
+not on the light intensities represented by them in the case that the
+image is a PGM or PPM image or PAM equivalent. You can use
+\fBpnmgamma\fP to convert such an image to one with samples proportional
+to light intensity, and then use \fBpamsummcol\fP on the result.
+.PP
+You can achieve the same thing as \fBpamsummcol -mean\fP with
+\fBpamscale\fP. Just scale vertically to a single row, without scaling
+horizontally at all. Use the pixel mixing method.
+
+
+.UN options
+.SH OPTIONS
+.PP
+You must specify exactly one of \fB-sum\fP, \fB-mean\fP,
+\fB-min\fP, or \fB-max\fP.
+
+
+.TP
+\fB-sum\fP
+.sp
+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.
+
+.TP
+\fB-mean\fP
+.sp
+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.
+
+.TP
+\fB-min\fP
+.sp
+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.
+
+.TP
+\fB-max\fP
+.sp
+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.
+
+
+
+.UN seealso
+.SH SEE ALSO
+.BR "pamsumm" (1)\c
+\&,
+.BR "pamflip" (1)\c
+\&,
+.BR "pamfunc" (1)\c
+\&,
+.BR "pamarith" (1)\c
+\&,
+.BR "pamscale" (1)\c
+\&,
+.BR "pam" (5)\c
+\&,
+
+.UN history
+.SH HISTORY
+.PP
+\fBpamsummcol\fP was added to Netpbm in Release 10.21 (March
+2004).
+.SH DOCUMENT SOURCE
+This manual page was generated by the Netpbm tool 'makeman' from HTML
+source. The master documentation is at
+.IP
+.B http://netpbm.sourceforge.net/doc/pamsummcol.html
+.PP \ No newline at end of file