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)