Let's delve deeply into color volume and what it means

[Penton-Man]

Originally Posted by Robert Zohn

The human visual system can see 7 stops of contrast, but the range varies based on the ambient light conditions....

Robert, there is no clear agreement as to what the simultaneous (instantaneous or static)
dynamic range of human vision exactly is (see next to the last paragraph of the Introduction here - https://pdfs.semanticscholar.org/cad...ab6b1c0c0d.pdf for references), but I think most would consider that 7 stop figure to be low balling it. These days most estimate it ranges from 10-14 stops (1000:1 to 16:000:1 contrast ratio) with consensus being ~ 12 stops, for static (instantaneous) dynamic range of the human visual system (HVS)….



With time, i.e. allowing time for papillary response and retinal (bleaching) adaptation (dark
adaptation taking longer than bright, on the order of tens of seconds to minutes), altogether the human visual system is capable of about 24 stops……



For those desiring to take a deeper dive, these are good introductory lectures to the HVS (for the current contrast discussion concentrate on Lecture #2,' the csf')… http://www.jennyreadresearch.com/201...visual-system/

by Jenny who has spoken at previous professional HDR workshops.