about dynamic range

[YongLee 0]

What is an 800% dynamic range and how it is calculated? thanks

[Bruce Greene 122]

I believe this kind of means 800% of REC 709 broadcast DR.

[YongLee 0]

I want to know how the '800% ' is calculated? thanks

[Bruce Greene 122]

I think, though not sure, that it's calculated by the slope of the gamma function.  Where did you find this reference to 800%?

I have an old Panasonic Varicam where, I assume broadcast DR is 100% and about 6 stops.  And 500% setting is about 11 stops.  If that helps you 🙂

[YongLee 0]

thanks 

[Robin R Probyn 240]

Its a common LUT in most Sony cameras  .. or MLUT as they call them.. the M being Monitor.. its a gamma curve .. used for monitoring slog .. useful in the EVF and to monitors .. is that where you are seeing it..

[Matthias Claflin 4]

I'm not sure where he is seeing it, but Canon has been using the 800% number for a while when advertising cameras with WideDR. Specifically their ENG Cameras (XA and XF series).

[Phil Rhodes 463]

Stops above native, whatever native is for that camera.

Stops double the amount of light every time, so 800% is three stops above 100% (200%, 400%, 800%.)

Er, I think.

[Michael Rodin 28]

How much stops there are between 0 and 100% is limited your camera's signal to noise ratio. Say, an F900 had, as far as I remember, 54 dB, which means you won't ever distinguish more than 9 stops in the 0 to 95 (or wherever the knee circuit kicks in) IRE range. 6dB equals a stop. Then you add 3 stops  (=800%) of range cramped in the highlight (say, 95...105) region nonlinearily - either using knee or with some gamma that has a shoulder (like a film H&D curve). In the latter case it's a bit more complicated since the whole "percents" terminology comes from the world of broadcast-legal video that doesn't necessarilly get color graded. 

Edited Wednesday at 08:01 PM by Michael Rodin