ra_t16(1)
convert RADIANCE picture to/from Targa 16 or 24-bit image file
SYNOPSIS
ra_t16
[
-2
][
-3
][
-g gamma
][
-e +/-stops
]
[
input
[
output
]
]
ra_t16
-r
[
-g gamma
][
-e +/-stops
]
[
input
[
output
]
]
DESCRIPTION
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
-3
option tells the program to produce a 24-bit image file instead.
The
-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
-e
option specifies an exposure compensation in f-stops (powers of two).
Only integer stops are allowed, for efficiency.
The
-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
-2
and
-3
options are not necessary.
If the output file is missing, the standard output is used.
AUTHORS
Greg Ward
BUGS
Run-length encoded files can be read but not written with this
program.