.\" RCSid "$Id: ra_bn.1,v 1.3 2004/03/26 22:58:20 greg Exp $"
.TH RA_BN 1 11/15/93 RADIANCE
.SH NAME
ra_bn - convert RADIANCE picture to/from Barneyscan image
.SH SYNOPSIS
.B ra_bn
[
.B "\-g gamma"
][
.B "\-e +/-stops"
]
{
.B input|-
}
[
.B output
]
.br
.B ra_bn
.B \-r
[
.B "\-g gamma"
][
.B "\-e +/-stops"
]
.B input
[
.B output
]
.SH DESCRIPTION
.I Ra_bn
converts between RADIANCE and Barneyscan native RGB image files.
Since Barneyscan images are stored in three files, one for each
color component, only the root file name is given and the program
appends the suffixes "red", "grn" and "blu".
The
.I \-g
option specifies the exponent used in gamma correction;
the default value is 2.0.
An exponent of 1.0 turns gamma correction off.
The
.I \-e
option specifies an exposure compensation in f-stops (powers of two).
Only integer stops are allowed, for efficiency.
The
.I \-r
option invokes a reverse conversion, from a Barneyscan image
to a RADIANCE picture.
.SH AUTHORS
Greg Ward
.SH "SEE ALSO"
pfilt(1), ra_bmp(1), ra_ppm(1), ra_pr(1), ra_pr24(1), ra_t8(1), ra_t16(1),
ra_tiff(1), ximage(1)