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Video scopes question

Started 7 months ago | Questions
jjdp Contributing Member • Posts: 606
Video scopes question

In FCPX, waveform, RGB parade for example, there are IRE values on the y-axis from -20 to 120. Googling this stuff tells me to not let things go below 0 or above 100. But I noticed something funny - I can raise brightness (or lower shadows) and the waveforms appear to remain whole until somewhere below/above 0 and 100. Seems the actual limits are around -7 and 110 here. What's going on? Does this mean I'm not actually "crushing the blacks" if the waveforms dip below 0?

I even tried exporting to mp4, uploaded to youtube, downloaded off youtube--obviously highly compressed at this point--dumped back into FCPX so I can view it on the scopes, and the waveforms were still intact below/above 0/100! Huh!?

(Fwiw, original footage from Sony a6500, cine2 profile, XAVC S HD)

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