NAME

       pamvalidate - validate Netpbm image format

SYNOPSIS

       pamvalidate

DESCRIPTION

       This program is part of Netpbm(1).

       pamvalidate  copies  a  Netpbm  image  from  Standard  Input to Standard Output, except that if there are
       certain violations of the image format in the input, pamvalidate fails without producing any output.

       This is most useful in a pipeline, before a stage you don't want to start working on Netpbm  input  until
       it knows it can get all the way through it.  For example, assume you are converting PPM images to PNG and
       you  don't  want to produce a partial PNG file under any circumstance.  If you just use pnmtopng, and the
       PPM input is truncated halfway through the raster, pnmtopng fails, but also produces about half of a  PNG
       file.   To  prevent  that,  pass  your  PPM  input  through  pamvalidate  on  its way to pnmtopng.  Then,
       pamvalidate will fail, and consequently the pipeline will fail, before pnmtopng has seen  any  input  and
       therefore before pnmtopng has produced any output.

       These are the kinds of format violations pamvalidate detects:

       •      A purported sample value exceeds the declared maxval.

       •      The stream ends prematurely.

       This program works on multi-image streams, producing a corresponding output stream.

       See pamfix for a way to salvage an invalid Netpbm image stream.

OPTIONS

       There  are  no  command  line options defined specifically for pamvalidate, but it recognizes the options
       common to all programs based on libnetpbm (See  Common Options .)

SEE ALSO

       pam(1) pnm(1) pamfix(1)

HISTORY

       pamvalidate was new in Netpbm 10.66 (March 2014).

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/pamvalidate.html

netpbm documentation                              22 March 2014                       Pamvalidate User Manual(1)