NAME

       pfsstat - Show frame / image statistics

SYNOPSIS

       pfsstat

DESCRIPTION

       This  command  will  show  a  short text statistic on each image in the pfs stream. In the
       statistics you can find:

       File - name of the input file

       Width, Height - image dimensions

       Minimum - minimum luminance of an image(*), given in linear
              units (relative luminance in cd/m^2) and logarithmic units

       Maximum - maximum luminance of an image(*)

       Average - average luminance of an image(*)

       Mean - mean luminance of an image(*)

       (*) Before min, max,  average,  median  and  dynamic  range  is  computed,  the  following
       processing  is  performed  on  an image: 1) negative and zero values are replaced with the
       smallest positive value (to compute logarithms); 2) the image is  low-pass  filtered.  The
       low-pass  filtering  removes  few  very  dark or very bright pixels that can significantly
       influence estimation of the dynamic range. The percentile, instead of a  low-pass  filter,
       is  sometimes  used  for  the same purpose. However, a low-pass filter is preferred to the
       percentile in pfstools since, taking into account the processing that is happening in  the
       human visual system, low-frequency band filter is more plausible.

       Note: This command requires GNU Octave.

EXAMPLES

       pfsin memorial.hdr | pfsstat

       Show statistics for the memorial image.

BUGS

       Please report bugs and comments to Rafal Mantiuk <mantiuk@mpi-sb.mpg.de>.

                                                                                       pfsstat(1)