As stated earlier in this thread, QuickTime format does not have metadata to define the range of the image and it seems to be a general consensus that most camera vendors generating Apple ProRes media files (in both QuickTime and MXF containers) use Legal range. In Flame Family products, the Include YUV Headroom option is per format or container and not per compressor so you need to be carefull when importing a selection of QuickTime files from various sources since imported content might be wrong. You can still edit this option in PreProcessing option after importing but still, that can be confusing.