NAME

       ra_bmp - convert RADIANCE picture to/from Windows BMP image

SYNOPSIS

       ra_bmp [ -b ][ -g gamma ][ -e spec ][ -p xr yr xg yg xb yb xw yw ] [ [ input|- [ output ] ]
       ra_bmp -r [ -g gamma ][ -e +/-stops ] [ [ input|- [ output ] ]

DESCRIPTION

       Ra_bmp  converts  between  RADIANCE  and  a  Windows BMP image.  During forward conversion, the -b option
       produces 8-bit grayscale output rather than 24-bit RGB.  The -g option specifies  the  exponent  used  in
       monitor  gamma  correction;  the  default value is 2.2.  The -e option specifies a tone-mapping method or
       exposure compensation.  If the argument is one of the special words "auto",  "human",  or  "linear",  the
       image  will  be  tone-mapped  with  histogram  adjustment, human vision simulation, or an averaged linear
       exposure, respectively.  (These words may be  abbreviated  by  one  or  more  letters.)   Otherwise,  the
       exposure  specification  is  interpreted as a linear compensation value in integer f-stops, which must be
       proceeded by a '+' or '-'.  The CRT color output primaries may be specified with the -p option.

       The -r option invokes a reverse conversion, from a Windows BMP image to a RADIANCE picture.  Tone-mapping
       and monitor primaries are not supported for reverse conversion.

       Ra_bmp can accept 16-bit or color-mapped BMP files on input, but cannot not produce them on output.

       A hyphen ('-') may be specified to indicate standard input for either forward or  reverse  conversion  so
       that  an  output file may be specified.  If the BMP input is taken from the standard input or sent to the
       standard output without tone-mapping, then the scanlines may  be  reversed  from  their  usual  ordering.
       Reversed  scanlines  sometimes  causes  difficulties  for  programs attempting to interpret the resulting
       RADIANCE picture or BMP image, which may be rejected or displayed inverted.

AUTHOR

       Greg Ward

SEE ALSO

       pfilt(1), ra_ppm(1), ra_pr(1), ra_pr24(1), ra_t8(1), ra_t16(1), ra_tiff(1), ximage(1)

RADIANCE                                             3/25/04                                           RA_BMP(1)