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.\" RCSid "$Id: compamb.1,v 1.2 2003/12/09 15:59:06 greg Exp $"
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.TH COMPAMB 1 1/23/98 RADIANCE
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.SH NAME
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compamb - compute good ambient value for a rad input file
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.SH SYNOPSIS
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.B compamb
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[
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.B \-c
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][
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.B \-e
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]
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.B rad_input_file
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.SH DESCRIPTION
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.I Compamb
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computes a good ambient value for the specified
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.I rad(1)
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variable file and appends it to the file as a "render= \-av" option.
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If the
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.I \-c
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option is specified, then
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.I compamb
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includes color information in the computed ambient value, rather than
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estimating a grey value to avoid rendering color shifts.
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If the
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.I \-e
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option is specified, then
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.I compamb
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also computes a good exposure value for this scene, and appends it to
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the
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.I rad
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file as well.
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.PP
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.I Compamb
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is a shell script that makes calls to other RADIANCE programs and utilities
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to do the actual work.
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A substantial amount of time may be required to complete this script, since
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.I compamb
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calls
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.I rpict(1)
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to render low resolution frames for each view in the
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.I rad
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file, setting "QUALITY=High" to compute interreflections.
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The resulting ambient file is thrown away, since it would disagree
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with the new \-av setting used for the final renderings.
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This method is preferable to setting the
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.I \-aw
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option of
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.I rpict,
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which frequently results in splotchy artifacts.
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.SH AUTHOR
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Greg Ward Larson
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.SH "SEE ALSO"
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lookamb(1), rad(1), rpict(1)
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