[Cin] Is the Waveform properly calibrated ?

Pierre autourduglobe p.autourduglobe at gmail.com
Fri Nov 20 01:33:10 CET 2020

I just checked under Cinelerra-CV 2.3...

The display has the same calibration problems. The white square is not 
displayed at 100 IRE.

Contrary to the CinGG Waveform there is the option (identified "Y'CbCr") 
to display two horisontal lines corresponding to the levels 7.5 and 
92(?) IRE.

Unfortunately even these lines do not seem to correspond to the values 
displayed by the Colors bar.


Le 20-11-19 à 18 h 47, Andrew Randrianasulu a écrit :
> В сообщении от Friday 20 November 2020 01:51:29 Pierre autourduglobe via Cin написал(а):
>> When I analyze a sequence of SMPT ntsc SD color bars generated by my DV
>> camera. The Waveform correctly indicates that the black bands are at 7.5
>> IRE but places the white band at around 92 IRE instead of 100 IRE and
>> the colored bands around 70 IRE instead of 75 IRE...
>> This in a project in DV ntsc YUV 720x480 format with the preferences
>> "YUV colors space" to BT601 and "YUV color range" to JPEG.
>> If you choose instead the preference "YUV color range" in MPEG, the
>> white band is correctly at 100 IRE and the colored bands are 75 IRE,
>> but... the black bands are now wrongly at 0 IRE...
> Unfortunately I don't even know off-head what IRE mean in this context ...:(
> But yes, there is possibility some settings not applied uniformely
> (because whole jpeg/mpeg thing was  implemented relatively lately in Cin's life)
> You might try other Cin forks and see if they behave correctly...
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