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LUT for low dynamic range


Video Assist Hungary
 

Hi all

Allow me to check my logic with you.

I was asked to do a LUT to simulate a camera with a dynamic range of 5 stops on an Alexa. That would mean to lose about 9 stops - it was not specified where.

I suppose i could grab levels controls and make a much steeper gamma curve. But the same result would be achieved by raising the highlights a lot, and maybe adjusting mid tones a bit, right? That would result in clipped whites, so a camera that has less stops ‘on the top’? Or similarly crushing the blacks?

Thanks
Balazs Rozgonyi
Ceo video Assist hungary


Geoff Boyle
 

Contrast 1.6 pivot 0.5 or something close.

 

This brings the DR down to about 5 stops.

 

cheers
Geoff Boyle NSC FBKS
EU based cinematographer
+31 637155076

www.gboyle.nl

www.cinematography.net

 

 

From: cml-raw-log-hdr@... <cml-raw-log-hdr@...> On Behalf Of Video Assist Hungary
Sent: 29 June 2020 08:05
To: cml-raw-log-hdr@...
Subject: [cml-raw-log-hdr] LUT for low dynamic range

 

Hi all

Allow me to check my logic with you.

I was asked to do a LUT to simulate a camera with a dynamic range of 5 stops on an Alexa. That would mean to lose about 9 stops - it was not specified where.

I suppose i could grab levels controls and make a much steeper gamma curve. But the same result would be achieved by raising the highlights a lot, and maybe adjusting mid tones a bit, right? That would result in clipped whites, so a camera that has less stops ‘on the top’? Or similarly crushing the blacks?

Thanks
Balazs Rozgonyi
Ceo video Assist hungary