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):
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.
Concatenate two animations into one and pass it to pipe for further processing.
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.