SimpleHDROfflineCaptureTest([imfilename][, dummymode][, sf])
'imfilename' - Filename of the HDR image to load. Will load our standard
low-dynamic range 'konijntjes' if 'imfilename' is omitted.
Psychtoolbox/PsychHardware/BrightSideDisplay/SimpleHDROfflineCaptureTest.m