Typically - no I don't have anything to comment on, however recent published works at SIGGRAPH (which we have verified) indicate that images featuring the Sun are going to need at least 17 stops above your reference exposure to not clip, never mind what may lie below your mid grey, so your talking a range of 2^20 at least.
If you want to colour manage for Cinema type environments then there were some recently SMPTE published findings indicating that in the darkness your ability to perceive low level modulation may be higher than generally has been assumed in the past (SMPTE DC-28 are currently suggesting 12 bit 2.6 gamma encoded XYZ) Combining these suggests that a linear encoding used to process HDR images needs more than 16 bit for no visual loss in the case where you want a one shoe fits all solution. Practically speaking, in the entertainment industry we get away with a lot more because the ideal conditions never happen (our outputs may get to a 5000:1 contrast ratio in the best real world cases today). This is certainly an area where ICC style profiles need extending to perform as well as needed for TV and Film work. Kevin -- | Kevin Wheatley, Cinesite (Europe) Ltd | Nobody thinks this | | Senior Technology | My employer for certain | | And Network Systems Architect | Not even myself | ------------------------------------------------------- This SF.Net email is sponsored by: YOU BE THE JUDGE. Be one of 170 Project Admins to receive an Apple iPod Mini FREE for your judgement on who ports your project to Linux PPC the best. Sponsored by IBM. Deadline: Sept. 24. Go here: http://sf.net/ppc_contest.php _______________________________________________ Lcms-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/lcms-user
