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.\" RCSid "$Id"
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.TH NORMPAT 1 11/15/93 RADIANCE
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.SH NAME
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normpat - normalize RADIANCE pictures for use as patterns.
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.SH SYNOPSIS
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.B normpat
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[
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.B \-v
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][
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.B \-b
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][
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.B \-f
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][
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.B "\-r maxres"
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]
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.B "picture .."
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.SH DESCRIPTION
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.I Normpat
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normalizes one or more RADIANCE pictures to an average brightness of 1.0
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and optionally removes fundamental frequencies and blends the edges
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of the image.
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The original images are overwritten during this process, and it is
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recommended that the program work on copies of the pictures for this reason.
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.PP
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The
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.I \-r
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option can be used to set the maximum horizontal or vertical resolution
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of the final result, which should not be greater than 256 for most
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patterns (due to the associated memory burden during rendering).
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The
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.I \-f
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option uses a Fourier transform to remove the lowest frequencies
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from the image, reducing the noticeability of pattern repitition.
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The
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.I \-b
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option can be used to blend the edges of the image so that when
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it is tiled, the seams are less apparent.
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The
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.I \-v
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option turns on the verbose flag, which prints on the standard output
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progress messages as the script runs.
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.PP
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.I Normpat
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is a shell script that makes calls to other RADIANCE programs
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that do the actual work.
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.SH AUTHOR
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Greg Ward
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.SH "SEE ALSO"
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getinfo(1), pcomb(1), pcompos(1), pfilt(1), pflip(1), protate(1),
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psign(1), ra_bn(1), ra_pr(1), ra_t8(1), ra_t16(1), rpict(1)
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