Rec709 (800%)

Chris Langer

Chris Langer

Well-known member
I am looking to build a picture profile to use for weddings, something that I don't have to grade later and looks good straight out of the camera. I really like the look of the REC709 (800%). Has anyone else had any luck playing around with the Picture Profile settings for this Gamma? If so, what values are you using?
 
Also, is there a place that explains each part of the Picture Profile? I am just curious since the manual doesn't have it.
 
I've heard people say that REC709 (800%) is used especially for viewing existing footage. I don't know. I think it would be bad for the kinds of high contrast you get at weddings. Since (I would think) you are particularly interested in highlights, I would think Cinegama 1 or 2 would be good choices.
 
In any HDR scenario, REC709(800%) will blow out the hilites and crush the shadows....both! It's designed for low contrast situations and will not work adequately for other scenarios.
 
Any kind of hypergamma is designed for getting the most stops over grey. Gamma has nothing to do with blown out higlights, exposing does.
 
Then I will guarantee you that if you expose for the highlites, you'll crush 25% of your HDR scene.:2vrolijk_08:
Conversely, exposing for the shadows will send those hilites into a sunlike orbit.
And in all cases, the noise will be a total disaster.
This is NOT a profile for hi contrast scenes, as it's designed to completely overfill the sensor's exposure latitude. This profile is intended for flat, controlled lighting. Expose it however you wish, it won't work.
 
Last edited:
As i wrote: using hypergamma is for getting the stops over grey the same as slog does. nothing to do with any kind of crushing anything. it was just an info.
 
If you look at the waveforms on my initial Slog test there's a REC709 800% on there. You can quite clearly see that the detail is in the highlights at the expense of detail in mids and shadows. So in other words you get your full range from black to white but the distribution is in the highlights. It's for monitoring - it allows you to get a good constrasty REC709 style image on the LCD when dealing with full range output (i.e. RAW output)

I cannot see any circumstance when you'd use this to record footage. SLog would be infinitely preferable.

the images are here http://blog.inventome.com/Blog/2013/9/fs700slog8bit/Sony-FS700-Slog-in-8bit-comparison

cheers
Paul
 
paulcurtis said:
I cannot see any circumstance when you'd use this to record footage. SLog would be infinitely preferable.
Click to expand...

This creates a more contrasty picture. Wouldn't you wanna use this let's say for when recording to AVCHD so you wouldn't want to push the image to much in post?
The only thing is that middle gray is really low.
 
KINOKS said:
This creates a more contrasty picture. Wouldn't you wanna use this let's say for when recording to AVCHD so you wouldn't want to push the image to much in post?
The only thing is that middle gray is really low.
Click to expand...

Well it's trying to represent REC709 which has a limited range to start with (compared to the other curves and slog) and then this flavour of it has a very low middle grey. There is almost no shadow detail to work with. It's just not offering anything that you can get to in a better way via other methods - it really is a monitoring solution.

cheers
Paul
 
You must log in or register to reply here.
Back
Top