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)