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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) , pamscale(1) , pamfunc(1) , pamarith(1) , pamscale(1) , pam(1) ,

HISTORY
       pamsummcol was added to Netpbm in Release 10.21 (March 2004).

netpbm documentation			 25 January 2009		Pamsummcol User Manual(0)
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