RA_BMP(1)						      General Commands Manual							 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 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 speci-
       fied.  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)