NAME
ra_t16 - 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.
SEE ALSO
pfilt(1), ra_bmp(1), ra_bn(1), ra_ppm(1), ra_pr(1), ra_pr24(1),
ra_t8(1), ra_tiff(1), ximage(1)