Computer RGB and Studio RGB in Vegas 8

Robert W wrote on 4/8/2008, 5:14 PM
Ok, this is where I am. I have been editing a concert film. As we have needed to maintain sync at all times, we first used one file to all the edit shots into a long real time edit of the concert. After that we nested the file inside what equates to a master file. We then made cuts in time in the master file.

I have been colour correcting this project on and off for a few months. I started the project and colour correction it in Vegas 6a. All the video was captured from a Sony Z1E in 50i HDV mode using the internal Vegas 6a capture window.

I switched to working in Vegas 8a shortly after it's release. The project remained in 8 bit mode.

I am making the following assumptions:

1) I assume that the video is converted internally to studio RGB but displays the image in the preview window as Computer RGB.

2) To avoid uncertainty with the colour corrections in the preferences menu, I add colour corrector plugins preset to "Studio RGB to Computer RGB" to each track while I am colour correcting. This should mean that the images are reproduced to the correct standard.

3) When I am ready to render, I switch off all of the "Studio RGB to Computer RGB" presets, and save the project ready for nesting into the master file. This usually means simply replacing the last version with the new version.

4) If I am rendering to mpg for a DVD, I add no colour correction to the master file. If I am rendering to WMA 9 Advanced Profile, I add a "Studio RGB to Computer RGB" corrector.

The thing that is troubling me is, I did a test render yesterday, and I really liked the look of it. I knew I must have messed something up, because it looked too different. When I checked, I realized I had forgotten to removed the colour correction I should have done in stage 3.

The thing is, I quite like the look of the film with what I guess is the wrong settings on. So there was in theory an unnecessary conversion from Studio to Computer RGB in there. It make have also been pulled in a bit as there was a broadcast colour Studio RGB Conservative preset in there as well, after the correction.

Concert footage on Channel 4 usually has a weird look which is a little like this. It makes it look a touch more filmic. The blacks look blacker and the brights look bright. Would it be a terrible sin for me leave deliberately leave a technically incorrect correction in there? I know its cheating. I know it will stand out to those in the know.

Anyway, I am totally confused now, but any guidance very gratefully received.

Cheers!

Rob,

Comments

farss wrote on 4/8/2008, 6:59 PM
"Would it be a terrible sin for me leave deliberately leave a technically incorrect correction in there?"

Non technical answer, no.
Unless your footage is going to be broadcast you can pretty much do what you like in reality. The only time I've had a technical nasty from bad levels is on VHS. Superblacks would make it through to the TV and cause a loss of sync. STB DVD players seem to clamp the levels at legal.

I would certainly recommend you check how it looks on a few devices. A STB DVD player and a PC Software player at least.

Personally I pretty much always keep my footage within the legal limits. You could just try using the Broadcast Colors FX at Conservative to see if you're still happy with the look of your footage.

Bob.
Robert W wrote on 4/9/2008, 3:13 AM
Thansk for your guidance Bob,

The chances are that at some point in the future this film will be broadcast. However, if we add the broadcast colour conservative plugin as the last in the chain, I am assuming that will ensure the signal remains legal.

My really concern is that it will be obvious that we took a bit of liberty with the surplus Computer to Studio RGB conversion. Our film will most likely only get a small scale commercial release initially, and we could not budget for a third party expert to come in and do a proper grade.

I think what I will do is produce two versions both ways of a couple of songs and do a straw poll on a few test viewers.
MH_Stevens wrote on 4/9/2008, 8:25 PM
I really think that even if it does look good to you that you should do "it right" so you can compare the two versions and feel confident in your decision.
GlennChan wrote on 4/9/2008, 11:53 PM
That would be a way of adding contrast to your footage.

Is it wrong? No. If you want to make that broadcast safe you could do it too (the Broadcast Colors filters could clamp off illegal values).

2- Personally I prefer to add contrast using Color curves to get a different contrast effect... which is a little more filmic as it doesn't clip shadow and highlight detail.

3- Do check that you're careful about monitoring.