Technical information about 'Highlight Recovery'

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Technical information about 'Highlight Recovery'

PostSun Nov 22, 2020 4:57 pm

I'm looking for deeper understanding of what the Highlight Recovery mode in the Raw Tab does.

The excellent manual says:

Highlight Recovery: A checkbox that lets you include additional highlight sensor data that’s usually clipped by the standard decoding matrix. In cases where you have extremely clipped peak highlights, you may obtain additional image detail this way, although it may contain unusual color artifacts.

All well and good, but not that detailed. It's noteworthy that it's off by default and it's certainly not a "if you want more DR, just check this box" box. If that was the case it would always be on.

I've had clips where the effect seemed like a pure win, and other clips that react closer to what the manual is describing.

I would like to learn more about this top area of the signal, that BMD ops to not include by default and what the inner workings/mappings are when the box is checked vs unchecked.

Info direct from BMD would be especially appreciated.
I use the following (might help me and/or others with trouble shooting)

BMD Pocket 6K | 1Dx mkII | XC10 |
12c MacPro5.1, 48GB, Vega Frontier Edition 16GB
10c iMac 5K, 32GB, 5700 XT 16GB
8c MacBook Pro 16", 32GB, 5500 8GB

Uli Plank

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Re: Technical information about 'Highlight Recovery'

PostTue Nov 24, 2020 2:42 am

Since BM will probably not answer questions about this, I'll try an educated guess (educated by Red).

What others are doing to achieve something similar is copying the color channel which is least clipped into the other two for the highlight only. This will completely desaturate the highlight but can bring back some detail. Unfortunately, one needs some transition into the fully colored luminance values, and that's where the method can fail if you have strong saturation close to clipping. We have done this manually years ago with a luma mask and some channel ops, I assume it is just a one-click version of that. It works pretty well if you don't have much color in the highlight areas to bring back some definition, up to a half stop or two thirds if you are lucky.
Resolve Studio 16.2.7 and Fusion Studio under MacOS Mojave 10.14.6
iMac 2017 Radeon Pro 580 8 GB VRAM and 32 GB RAM
2018 Mac mini 16 GB RAM plus eGFX Breakway Radeon RX 580
(currently my test system for DR 17 beta 2 under Catalina 10.15.7)

Hendrik Proosa

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Re: Technical information about 'Highlight Recovery'

PostTue Nov 24, 2020 9:14 am

My guess would be same as Uli’s, it does a clipped channel restoration by shuffling values from other channels.
I do stuff.

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