this reads .exr files if they are 3 channel half float encoded.
filename the name of the input file, potentially containing %04d for sequencesstartid the index of the first file if loading a sequencenoise a the gaussian portion of the noise modelnoise b the poissonian portion of the noise modelprim the primaries used to encode this filetrc the tone response curve applied to the data in this file (this will be undone to go to linear in the colour module)output half floating point precision pixel data