NORMPAT(1)						      General Commands Manual							NORMPAT(1)

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 fre-
       quencies  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)

RADIANCE
							     11/15/93								NORMPAT(1)