NAME¶
pfsinrgbe - Load images or frames in Radiance RGBE format
SYNOPSIS¶
pfsinrgbe [--linear] (<file> [--frames <range>]
[--skip-missing]) [<file>...]
DESCRIPTION¶
pfsinrgbe command loads images in Radiance RGBE format and writes
pfs stream to the Standard Output. The
pfs stream is usually
piped to another program for further processing. To detect the format
automatically based on the extension, use
pfsin command.
Since RGBE is an HDR format, 'LUMINANCE' tag is set to 'RELATIVE' (relative
linear luminance values).
To read images from standard input use a single dash '-' instead of filename.
The images are read until EOF is reached.
Each file 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 the following options (the options must be always
given after the file name):
- --frames <range>
- Range is given in mathlab / octave format:
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.
- --skip-missing
- Skip up to ten frames in a row if corresponding files are missing.
Otherwise the program stops reading sequence at the first file that does
not exists. This switch does not apply to the first frame in a sequence.
This switch can be useful if there is a rendered animation where some of
the frame has not been generated.
- --linear
- Ignored for compatibility with pfsinppm.
EXAMPLES¶
- pfsinrgbe intro%d.hdr frame%d.hdr | ...
-
Concatenate two animations into one and pass it to pipe for further
processing.
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 uses the WHITE_EFFICACY constant equal to 179.0f to
convert from radiance to luminance. This in practice means that the values
displayed with pfsview maybe higher than expected. To compensate for this
incompatibility we suggest to use
pfsabsolute command:
pfsinrgbe measured_luminance.hdr | pfsabsolute 1 179 | pfsview
This is not necessary when RGBE files are saved using
pfsoutrgbe,
Radiance package, mkhdr or Photospheare. This is also not relevant when only
relative absolute values are considered.
BUGS¶
Please report bugs and comments on implementation to the discussion group
http://groups.google.com/group/pfstools
SEE ALSO¶
pfsin(1),
pfsout(1)