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CentOS 7.0 - man page for pamsumm (centos section 0)

Pamsumm User Manual(0)							   Pamsumm User Manual(0)

       pamsumm - Summarize the samples in a Netpbm image arithmetically

       pamsumm { -sum | -mean | -min | -max } [-normalize] [-brief] [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.

       This program is part of Netpbm(1)

       pamsumm	reads  a  Netpbm  image (PNM or PAM) and performs a summary function over all the
       samples in all the rows, columns, and planes and prints the result to Standard Output.

       pamsumm performs the operation on the actual sample values.  In the case of a PGM  or  PPM
       or  PAM	equivalent  (i.e.  a visual image), this is not the same as the light intensities
       represented by those samples.  See the format specifications of	PGM(1)	,  PPM(1)  ,  and
       PAM(1)  ,  for the precise meanings of samples in these formats.  If you want to do arith-
       metic on light intensities of such a visual image, you can use pnmgamma to convert  it  to
       one with samples proportional to light intensity, and then use pamsumm on the result.

       If  you	want to summarize by column (e.g. add up the columns separately), use pamsummcol.
       If you want to summarize by row, use a combination of pamsummcol and pamflip.  If you want
       to summarize a particular plane, use pamchannel to extract it and then pamsumm.

       You must specify exactly one of -sum, -mean, -min, or -max.


	      This option makes the summary function addition.


	      This option makes the summary function arithmetic mean.


	      This option makes the summary function arithmetic minimum.


	      This option makes the summary function arithmetic maximum.


	      This option causes each sample to be normalized to a fraction
		   (in the range 0..1) so the result is independent of the image's
		   maxval.  E.g. if you request the mean of an image which has maxval
		   200 and all the samples have value 50, pamsumm will give you
		   50 as an answer.  But pamsumm -normalize will give you .25.

	      If instead you want a result that is independent of maxval but still
		   in integers, you can use pamdepth to convert the input to some
		   standard maxval and not use -normalize.  For example, if you want
		   the mean brightness of a PPM image, on a scale of 0 to 99, do

		  pamdepth 99 myimage.ppm | pamsumm -mean

	      This option was new in Netpbm 10.22 (April 2004)


	      This option causes pamsumm to display the answer as a bare
		   number, rather than in a complete sentence.

	      This option was new in Netpbm 10.22 (April 2004)

       pamsumm(1) , pam(1) ,

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

netpbm documentation			 26 October 2012		   Pamsumm User Manual(0)

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