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.\" RCSid "$Id: ra_t16.1,v 1.2 2003/12/09 15:59:06 greg Exp $"
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.TH RA_T16 1 11/15/93 RADIANCE
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.SH NAME
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ra_t16 - convert RADIANCE picture to/from Targa 16 or 24-bit image file
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.SH SYNOPSIS
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.B ra_t16
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[
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.B \-2
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][
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.B \-3
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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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.br
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.B ra_t16
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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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[
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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_t16
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converts between RADIANCE and Targa 16-bit or 24-bit RGB image files
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(type 2 in Targa's documentation).
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In the default mode, a RADIANCE picture is converted to an
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RGB file of the same horizontal and vertical dimensions with
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16-bits per pixel.
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The
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.I \-3
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option tells the program to produce a 24-bit image file instead.
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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 1.0 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 16-bit or 24-bit
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Targa file to a RADIANCE picture.
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The determination of depth is made automatically on reverse
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translation, so the
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.I \-2
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and
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.I \-3
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options are not necessary.
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If the output file is missing, the standard output is used.
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.SH AUTHORS
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Greg Ward
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.SH BUGS
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Run-length encoded files can be read but not written with this
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program.
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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_pr24(1),
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ra_t8(1), ra_tiff(1), ximage(1)
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