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Resolve Scopes: different values than on Ultrascope
Posted:
Fri Dec 16, 2016 5:31 pmby Gerardo Arceri
We started using the built-in Resolve scopes, recently while working with both our old Ultrascope in parallel with the davinci scopes, we noticed that the levels on the waveform display in the built-in scopes are higher than on the Ultrascope display.
These are the specs:
Davinci Resolve Linux 12.5
Decklink Extreme 4K (output to ultrascope over SDI)
Nvidia GTX 960
Any help will be appreciated
Re: Resolve Scopes: different values than on Ultrascope
Posted:
Sat Dec 17, 2016 6:22 amby JP Perry
Could this be a Video vs Data levels issue under Video Monitoring?
Re: Resolve Scopes: different values than on Ultrascope
Posted:
Sat Dec 17, 2016 5:01 pmby waltervolpatto
snap a picture of the bats and grayscale worth your phone
Re: Resolve Scopes: different values than on Ultrascope
Posted:
Sat Dec 17, 2016 6:38 pmby Blake LaFarm
Haven't fired up my UltraScope in a long time, but I just did and I don't think I'm seeing any incongruities. Of course, Resolve's scopes are all based on 10 bit, so that could be an issue.
Re: Resolve Scopes: different values than on Ultrascope
Posted:
Mon Jan 02, 2017 7:50 pmby Blake LaFarm
@Gerardo Arceri
Did you ever track down your problem?
Just to elaborate on my last post regarding differing bit levels, pure white (100 IRE on a RGB Waveform) has the following 8-Bit and 10-Bit values in RGB and Video Color Spaces:
255 IRE -- 8-Bit RGB Color Space
235 IRE -- 8-Bit Video Color Space
1023 IRE -- 10-Bit RGB Color Space
940 IRE -- 10-Bit Video Color Space
Re: Resolve Scopes: different values than on Ultrascope
Posted:
Tue Jan 03, 2017 12:36 amby JPOwens
Blake LaFarm wrote:Haven't fired up my UltraScope in a long time, but I just did and I don't think I'm seeing any incongruities. Of course, Resolve's scopes are all based on 10 bit, so that could be an issue.
What the black/white 0/100 correspondence in 8-bit or 10-bit is not the same range issue as the absolute calibration corresponding to the "top" and the "bottom" of the scale hashmarks, which in Resolve is a bit misleading, especially when it is calibrated in bit values. A waveform monitor should measure IRE when operating in 709 and then doing something like popping up a bar reference will show you what is what.
jPo.