Preview LUT, judging exposure and clipping indicator

Just testing a rented spark right now and trying to get a sense how I can judge exposure and whats actually in the RAWs.

For example thats how the clip comes in as Rec709 in Resolve: 

It was clearly clipped when I shot it but did not look quite as bad.  Once set to LOG and with my quick Slog3 transform + a creative LUT, things look really nice. No detail lost.

My question is: how can you confidentially exposure and know that your highlights are not clipped. Obviously underexposing until nothing is clipped in Rec709 preview would result in a massively underexposed image and create noise issues. 

  1. There needs to be a LOG preview that matches the BMD Film Log that Resolve gets.  

  2. Preferably a Cube LUT could be loaded - worst case the LUT could be applied in-monitor. 

  3. A highlight clipping indicator (like RED has with its goalpost or Sony coloring clipped areas of the image red) and a False Color a la EL Zone would be insanely helpful. 

Nothing worse than blown highlights and with cameras that already have a limited DR, really nailing exposure will be crucial.

Last but not least, I just ran a very rudimentary DR test and it appears that DR stays consistent between 400, 800 and 1600 ISO.  So the camera is indeed not what a traditional Dual-ISO camera would be.  Each is a native, analog ISO without any gamma-redistribution like you’d experience with most modern cameras (Alexa, Venice, REDs etc).  Need to do more testing but thought this was an interesting finding to share!

Cheers!

1 Like

Yea so far I was using False color on Atomos which works in practise but it’s unclear if actual clipping levels match what camera can do.

On grading note for some clips I tried this and it produced more details than Blackmagic color space:

I hope true colorist nerds will eventually pick up on this to see what are the best settings to use :slight_smile: