.\" RCSid "$Id: ra_t16.1,v 1.2 2003/12/09 15:59:06 greg Exp $"
.TH RA_T16 1 11/15/93 RADIANCE
.SH NAME
ra_t16 - convert RADIANCE picture to/from Targa 16 or 24-bit image file
.SH SYNOPSIS
.B ra_t16
[
.B \-2
][
.B \-3
][
.B "\-g gamma"
][
.B "\-e +/-stops"
]
[
.B input
[
.B output
]
]
.br
.B ra_t16
.B \-r
[
.B "\-g gamma"
][
.B "\-e +/-stops"
]
[
.B input
[
.B output
]
]
.SH DESCRIPTION
.I Ra_t16
converts between RADIANCE and Targa 16-bit or 24-bit RGB image files
(type 2 in Targa's documentation).
In the default mode, a RADIANCE picture is converted to an
RGB file of the same horizontal and vertical dimensions with
16-bits per pixel.
The
.I \-3
option tells the program to produce a 24-bit image file instead.
The
.I \-g
option specifies the exponent used in gamma correction;
the default value is 2.2.
An exponent of 1.0 turns gamma correction off.
The
.I \-e
option specifies an exposure compensation in f-stops (powers of two).
Only integer stops are allowed, for efficiency.
The
.I \-r
option invokes a reverse conversion, from a 16-bit or 24-bit
Targa file to a RADIANCE picture.
The determination of depth is made automatically on reverse
translation, so the
.I \-2
and
.I \-3
options are not necessary.
If the output file is missing, the standard output is used.
.SH AUTHORS
Greg Ward
.SH BUGS
Run-length encoded files can be read but not written with this
program.
.SH "SEE ALSO"
pfilt(1), ra_bn(1), ra_ppm(1), ra_pr(1), ra_pr24(1),
ra_t8(1), ra_tiff(1), ximage(1)