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.\" RCSid "$Id: ra_pr24.1,v 1.3 2004/03/26 22:58:20 greg Exp $"
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.TH RA_PR24 1 11/15/93 RADIANCE
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.SH NAME
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ra_pr24 - convert RADIANCE picture to/from 24-bit rasterfile
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.SH SYNOPSIS
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.B ra_pr24
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[
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.B \-r
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|
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.B \-rgb
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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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.B output
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]
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]
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.SH DESCRIPTION
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.I Ra_pr24
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converts between RADIANCE and 24-bit pixrect rasterfile formats.
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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 2.2.
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An exponent of 1 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 24-bit rasterfile to
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a RADIANCE picture.
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If the
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.I \-rgb
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option is used, the output rasterfile will be in RGB byte-ordering
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rather than the more standard (for Sun) BGR ordering.
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Byte ordering is determined automatically for the reverse
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conversion.
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If the output file is missing, the standard output is used.
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If the input file is missing as well, the standard input is used.
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.SH AUTHOR
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Greg Ward
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.SH BUGS
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Only standard 24-bit color rasterfiles are read or written.
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.SH "SEE ALSO"
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pfilt(1), ra_bmp(1), ra_bn(1), ra_ppm(1), ra_pr(1), ra_t8(1), ra_t16(1),
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ra_tiff(1), ximage(1)
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