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.\" RCSid "$Id"
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.TH RA_BN 1 11/15/93 RADIANCE
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.SH NAME
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ra_bn - convert RADIANCE picture to/from Barneyscan image
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.SH SYNOPSIS
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.B ra_bn
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[
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.B "\-g gamma"
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][
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.B "\-e +/-stops"
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]
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{
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.B input|-
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}
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[
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.B output
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]
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.br
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.B ra_bn
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.B \-r
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[
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.B "\-g gamma"
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][
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.B "\-e +/-stops"
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]
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.B input
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[
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.B output
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]
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.SH DESCRIPTION
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.I Ra_bn
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converts between RADIANCE and Barneyscan native RGB image files.
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Since Barneyscan images are stored in three files, one for each
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color component, only the root file name is given and the program
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appends the suffixes "red", "grn" and "blu".
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The
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.I \-g
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option specifies the exponent used in gamma correction;
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the default value is 2.0.
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An exponent of 1.0 turns gamma correction off.
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The
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.I \-e
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option specifies an exposure compensation in f-stops (powers of two).
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Only integer stops are allowed, for efficiency.
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The
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.I \-r
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option invokes a reverse conversion, from a Barneyscan image
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to a RADIANCE picture.
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.SH AUTHORS
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Greg Ward
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.SH "SEE ALSO"
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pfilt(1), ra_ppm(1), ra_pr(1), ra_pr24(1), ra_t8(1), ra_t16(1),
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ra_tiff(1), ximage(1)
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