Exposure on Viper Filmstream (Raw)
Posted 09 February 2011 - 06:07 AM
I was trained to try to expose images technically, using the waveform as a basic tool, but shot my last jobs with some DPs that like to expose the way they want the image to be at final point, rejecting the safety room I would recomend as a technitian)
My concern is about the final broadcast image: I know that the DP us exposing like we would do with a negative stock, but I'm not quite sure about how this increased latitude will output in TV, basically I'm concerned about the possibility of loosing too much detail in highlights (we're exposing until 109 IRE)
Would like to know opinions about if it would be better to expose using the Input-output levels recommendations (setting the grey point at 40IRE and the skin tones at 50-60IRE, which would feed an underexposed looking image) or if to expose by eye and then trusting colour correction...
I know this post can seem a little basic but I've heard so many opinions about that that I'm not sure about the best reasons to use one or another method.
Posted 09 February 2011 - 06:31 AM
The usual approach is to generally watch a monitor with a LUT in it - if you have Cinetal, you're in a great position. Personally I quite like to have a LUT that makes things look just slightly more clippy than they really are, just by a couple of per cent, so that when you see it just start to clip on the monitor, you have some hope that you still have it on the actual recording. Nobody should be routinely looking at the unprocessed log image and trying to light to that.
How are you recording it?
Posted 09 February 2011 - 09:55 AM
What would you do with grey points and skin tones (the luts are made to respect the average mid tones, but if the faces are underexposed, or there's big contrast on the scene, sometimes it's difficult to judge if not by eye... I just trust the DP and call his attention if I see the whites above 100IRE)
I'm also using an early version of IRIDAS SPEEDGRADE to create LUTs for the CINETAL, do you know any other application (my version doen't have a waveform monitor).
I'm also concerned about green channel overexposure, as I'm judging a YCbCr 422 signal with the astro monitor, I don't know where my 3 channels are one in relationship to another, just guess that luminance channel still the green one and guessing that this channel will be the first one to clip...