.TH "pfsoutrgbe" 1
.SH NAME
pfsoutrgbe \- Write images or frames in Radiance RGBE format
.SH SYNOPSIS
.B pfsoutrgbe [--verbose] [--radiance] [--quiet]
(<file> [--frames <range>])  [<file>...]

.SH DESCRIPTION
Use this command to the incoming pfs frames (piped to standard input)
to Radiance RGBE files (with .hdr extension).
.PP
Each file name can contain a \%%d pattern, which is substituted with frame
numbers. The pattern has the same syntax as C
.I printf
command. For example, you can use \%%04d to make the frame number
four digit with proceedings zeros. You can select the frames using --frames option (see below).

.SH OPTIONS
.TP
.B \--frames <range>
The range of frames is given in a format similar to matlab or octave:

.B "startframe:step:endframe"

Frame numbers start with
.B "startframe"
(default 0), are increased by
.B "step"
(default 1) and stop at
.B "endframe"
You can skip one of those values, for example
.I "1:100"
for frames 1,2,...,100 and
.I 0:2:
for frame 0,2,4,... up to the last file that exists. Note that --frames option must be specified after the file
name containing \%%d string.
higher bit depths.

.TP
.B \--radiance, -r
Correct stored values so that the luminance is reported the same in pfsview and radiance tools (xview or Photospheare). See IMPORTANT NOTE below.

.TP
.B \--quiet, -q
Disable warning message about the change in handling absolute values in RGBE files. See IMPORTANT NOTE below.

.SH EXAMPLES

.TP
 pfsin memorial.tiff | pfsoutrgbe memorial.hdr
Converts from one HDR format to another

.TP
pfsin test.jpg | pfsout test.png
Convert from one image format to another.
.SH "SEE ALSO"
.BR pfsout (1)
.BR pfsinppm (1)

.SH IMPORTANT NOTE

There is an incompatibility between viewers of RGBE format in terms of
absolute luminance values. The ximage viewer from Radiance package
expects radiance values in RGBE files and multiplies the resulting luminance by the WHITE_EFFICACY
constant equal to 179.0f to convert from radiance to luminance. 
.PP
To remain compatible with Radiance (xview and Photospheare), 
pfstools prior to 1.9.0 divided red, green and blue values by 179 on writing and multiplied by 
that constant on reading RGBE files. This in turn caused incompatibility with other software, 
such as Photoshop or HDR toolbox. Starting from 
pfstools 1.9.0 this division / multiplication step was removed to make pfstools compatible in 
terms of absolute values with the majority of the software. The downside is that this change made 
.hdr files created with the earlier versions of pfstools incompatible (in terms of absolute 
luminance units) with the pfstools 1.9.0 or later. To avoid any mistakes because of that change, 
a long warning messages is shown each time pfsinrgbe or pfsoutrgbe is called. The message can be 
suppressed with --quiet option.
.PP
To enable the old functionality and read or write RGBE files with the correction for WHITE_EFFICACY, add --radiance option to the command line.

.SH BUGS
Please report bugs and comments on implementation to 
the discussion group http://groups.google.com/group/pfstools