Proper Saturation Levels

Streamworks Audio wrote on 8/17/2009, 5:14 PM
Hey folks.... more thoughts to throw out there....

Proper Saturation Levels. I have been playing around with these levels the last couple days after thinking that some shots from my AVCHD cam that I did at the beach the other day seemed to be heavily saturated. Using the vectorscope I can see that often the reds are way up there and sometimes beyond 100%.

Now from what I read NTSC states that colors cannot be more than 75% saturated to ensure a broadcast safe signal. So I am wondering - if I was to comply with NTSC standards should I pull down the saturation on the offending clips till the most saturated points are down to 75% (say the reds for example).

I have for kicks imported some Blu Ray (1080 24p) film material to look at their levels. and I notice that for one thing the waveform seems to have less contrast than most NTSC material. The tested scene was a bright day shot with blown out sky and even then, only registered 75-80% for whites on the waveform meter. But what I found interesting is the vectorscope shows that the colors were only roughly 40% saturated. I guess this the nature of film.

What I am wondering is what people see as being a safe saturation level? I find often decreasing the saturation on the clips from my cam are most pleasant and easy to look at. How about you guys?

Cheers,
Chris

Comments

farss wrote on 8/17/2009, 6:30 PM
Are you by any chance running Vegas in 32bit float?
How are you setting up your waveform monitor?
Have you read Glenn Chan's articles?

Bob.
Streamworks Audio wrote on 8/17/2009, 6:41 PM
I still use 8bit projects

I am using 16-235 Waveform meter

and yes I read most of Glen's articles ;-) I don't recall many regarding saturation.

Cheers,
Chris
farss wrote on 8/17/2009, 7:03 PM
OK, got the obvious out of the way.

As far as I'm aware saturation can go to 100% so long as it's not out of gamut. Vegas's gen media has little yellow warning triangles if you're creating illegal colors. I doubt a video camera would record anything seriously out of gamut, just watch your luma levels and you should be safe enough. Aside from that adjust saturation to creative taste.

For the beach a ND or polarising filter is a good thing to have in the kit bag. For the small cameras not overly expensive either. I think Sony have a kit that includes both.

Bob.
Streamworks Audio wrote on 8/17/2009, 7:13 PM
Cheers!

I did in fact use a polarizing filter. It was mostly reds that were giving me probs - I will look at them again. So 100% is safe? Not 75%. I have never seen the yellow triangles before - I thought that was a FCP thing.

Cheers again,
Chris