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)