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normpat - normalize RADIANCE pictures for use as patterns.
normpat [ -v ][ -b ][ -f ][ -r maxres ] picture ..
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.
Greg Ward
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)
Header and Footer
NORMPAT(1) RADIANCE (11/15/93) NORMPAT(1)
Page 1 (printed 7/17/96)
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