Radiance ra_t16 program

RA_T16(1)                                                            RA_T16(1)

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 RADI-
       ANCE 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  speci-
       fies  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  transla-
       tion,  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)

RADIANCE                           11/15/93                          RA_T16(1)