Radiance ra_bmp program

RA_BMP(1)                                                            RA_BMP(1)

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  for-
       ward  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 abbrevi-
       ated 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  sup-
       ported 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  stan-
       dard  output  without  tone-mapping, then the scanlines may be reversed
       from their usual ordering.  Reversed scanlines sometimes causes  diffi-
       culties  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)