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ra_rgbe - change run-length encoding of a RADIANCE picture
ra_rgbe [ -r ][ -e +/-stops ] [ input [ output ] ]
Ra_rgbe converts between RADIANCE run-length encoded and
flat formats. The -e option specifies an exposure
compensation in f-stops (powers of two). Only integer stops
are allowed, for efficiency. By default, ra_rgbe produces a
flat RADIANCE picture file from any type of RADIANCE input
picture. The -r option causes ra_rgbe to produce a runlength
encoded file instead. If the output file is missing,
the standard output is used. If the input file is missing
as well, the standard input is used.
The file format for RADIANCE pictures was changed between
release 1.4 and release 2.0. The older format can still be
read by all the programs, but only the newer format is
produced. This newer format cannot be read by RADIANCE
software prior to release 2.0.
Ra_rgbe provides some downward compatibility by producing
files that can be read by older RADIANCE software. The
resultant files are also easier to manipulate with programs
designed to read raw raster data.
The other use for ra_rgbe is as a quicker way to adjust the
exposure of a RADIANCE picture than pfilt(1), since ra_rgbe
only allows integer f-stop changes. In this mode, ra_rgbe
should be used with the -r option.
Greg Ward
Work on this program was initiated and sponsored by the LESO
group at EPFL in Switzerland.
pfilt(1), ra_xyze(1)
Header and Footer
RA_RGBE(1) RADIANCE (10/16/95) RA_RGBE(1)
Page 1 (printed 7/17/96)
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