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)