NAME

pfsoutrgbe - Write images or frames in Radiance RGBE format

SYNOPSIS

pfsoutrgbe [--verbose] [--radiance] [--quiet] (<file> [--frames <range>]) [<file>...]

DESCRIPTION

Use this command to the incoming pfs frames (piped to standard input) to Radiance RGBE files (with .hdr extension).

Each file name can contain a %d pattern, which is substituted with frame numbers. The pattern has the same syntax as C 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).

OPTIONS

--frames <range>

The range of frames is given in a format similar to matlab or octave:

startframe:step:endframe

Frame numbers start with startframe (default 0), are increased by step (default 1) and stop at endframe You can skip one of those values, for example 1:100 for frames 1,2,...,100 and 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.

--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.

--quiet, -q

Disable warning message about the change in handling absolute values in RGBE files. See IMPORTANT NOTE below.

EXAMPLES

pfsin memorial.tiff | pfsoutrgbe memorial.hdr: Converts from one HDR format to another
pfsin test.jpg | pfsout test.png: Convert from one image format to another.

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.

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 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.

To enable the old functionality and read or write RGBE files with the correction for WHITE_EFFICACY, add --radiance option to the command line.

BUGS

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