NAME

       normpat - normalize RADIANCE pictures for use as patterns.

SYNOPSIS

       normpat [ -v ][ -b ][ -f ][ -r maxres ] picture ..

DESCRIPTION

       Normpat  normalizes  one  or  more  RADIANCE  pictures to an average brightness of 1.0 and
       optionally removes fundamental frequencies  and  blends  the  edges  of  the  image.   The
       original  images  are  overwritten  during  this  process,  and it is recommended that the
       program work on copies of the pictures for this reason.

       The -r option can be used to set the maximum horizontal  or  vertical  resolution  of  the
       final  result,  which  should  not  be  greater  than  256  for  most patterns (due to the
       associated memory burden during rendering).  The -f option uses  a  Fourier  transform  to
       remove  the  lowest  frequencies  from  the  image,  reducing the noticeability of pattern
       repitition.  The -b option can be used to blend the edges of the image so that when it  is
       tiled, the seams are less apparent.  The -v option turns on the verbose flag, which prints
       on the standard output progress messages as the script runs.

       Normpat is a shell script that makes calls to other RADIANCE programs that do  the  actual
       work.

AUTHOR

       Greg Ward

SEE ALSO

       getinfo(1),  pcomb(1),  pcompos(1),  pfilt(1),  pflip(1),  protate(1), psign(1), ra_bn(1),
       ra_pr(1), ra_t8(1), ra_t16(1), rpict(1)