LUT for broadcast safe…..

[Andrew Sableton]

By the way I have done some tests on rendering out color bars (1080i prores HD) and applying the “normally scaled legal video” setting in either or both the Config and Render rooms seems to make no difference to the render at all. Whether applied or not the quicktime seems to come out exactly the same.

Applying an output LUT in the config room does change the render.

AS

[Joseph Owens]

[andrew sableton] “applying the “normally scaled legal video” setting in either or both the Config and Render rooms seems to make no difference to the “

It shouldn’t. It isn’t a legalizer.

Its actually very difficult to produce out of gamut values in normal scaling.

jPo

You mean “Old Ben”? Ben Kenobi?

[Joseph Owens]

[andrew sableton] “applying the “normally scaled legal video” setting in either or both the Config and Render rooms seems to make no difference to the “

It shouldn’t. It isn’t a legalizer.

Its actually very difficult to produce out of gamut values in normal scaling. It only changes the 0-1023 full scale mapping for broadcast 94-940.

jPo

You mean “Old Ben”? Ben Kenobi?

[Andrew Sableton]

Is it correct that the “Normally scaled legal video” setting in the config room only effects the HD-SDI output – not the render?

Also, what does the setting on the render page do?

Is anyone using LUTs to scale the renders to 64 – 940? If so I would love to know what settings you are using for your LUT – never made or used a LUT before…..

AS

[Kevin Cannon]

Here’s some copy pasta from this thread and this thread

****
Yup, the video monitoring selection of full-range vs. legal only applies to the video outputs from the card – if you want that transform to appear in your renders, use an output LUT that scales to 64-940 (you can create one in just a minute with the soft clip lot generation tool).

Once you add the LUT you will probably want to switch your monitoring to “full range” to avoid doubling up the effect, but you should get an identical image to your displays. I usually use external scopes, but I imagine that you would see the scaling on the internal scopes.

****
You can add an output LUT that will scale (or clip) DaVinci’s internally 0-1023 into 64-940. Davinci provides a DataToVideoScale LUT, but nobody has been able to tell me why the provided one seems to clip information in the shadows and highlights.

I recently used the “generate soft clip LUT” tool to create a LUT with 64-940 range and “scale” enabled. With that LUT and “monitoring in full range” the show looked identical to how it did without the LUT and “monitoring in scaled legal values” was enabled.

That LUT should be applied to any file outputs (I only have tried it with DPX though)…
****

Cheers,

KC

[Andrew Sableton]

Thanks Kevin,

Now I know what to do!

AS

[Gabriele Turchi]

i thought that YUV codec are rendered using video range levels … so output proves should no require a Lut

i always used scaled on the SDI and no lut on output , never have an issue …

sent those proves to broadcast station and nobody ever complained … also the proves look “””correct””” in QT player ..

g

Davinci Resolve Control Surface
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[Kevin Cannon]

Yes, Gabrielle is right on that… usually you don’t need to manually apply the legal values scaling… but if you do need to (like to create legal value DPX) that is one way to do it. And now that they’ve put the full range/legal option in the render window, I think you can use that instead as well…

KC

[Andrew Sableton]

I”m no video engineer but I know that if we don’t do some legalization we always get kicked back on QC by the networks.

AS

[Joseph Owens]

Haven’t run into that, much, lately. Output in my system is continuously QA-monitored via Videotek TVM-900 which displays gamut errors directly, so the problem gets fixed on the day.

The other little detail with some real, outboard scopes is that they also decode 608/708 Closed Captions, which saves another $5-$7 grand on extra equipment, but only if you deliver that sort of thing.

jPo

[andrew sableton] ” if we don’t do some legalization we always get kicked back on QC”

You mean “Old Ben”? Ben Kenobi?