YongLee Posted August 12, 2019 Share Posted August 12, 2019 What is an 800% dynamic range and how it is calculated? thanks Link to comment Share on other sites More sharing options...
Bruce Greene Posted August 12, 2019 Share Posted August 12, 2019 I believe this kind of means 800% of REC 709 broadcast DR. Link to comment Share on other sites More sharing options...
YongLee Posted August 12, 2019 Author Share Posted August 12, 2019 I want to know how the '800% ' is calculated? thanks Link to comment Share on other sites More sharing options...
Bruce Greene Posted August 13, 2019 Share Posted August 13, 2019 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 ? Link to comment Share on other sites More sharing options...
YongLee Posted August 19, 2019 Author Share Posted August 19, 2019 thanks Link to comment Share on other sites More sharing options...
Robin R Probyn Posted August 21, 2019 Share Posted August 21, 2019 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.. Link to comment Share on other sites More sharing options...
Matthias Claflin Posted August 21, 2019 Share Posted August 21, 2019 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). Link to comment Share on other sites More sharing options...
Premium Member Phil Rhodes Posted August 21, 2019 Premium Member Share Posted August 21, 2019 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. Link to comment Share on other sites More sharing options...
Michael Rodin Posted August 21, 2019 Share Posted August 21, 2019 (edited) 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 August 21, 2019 by Michael Rodin Link to comment Share on other sites More sharing options...
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