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)