Dolby Vision from iPhone 12 Pro

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sackboydad

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  • Real Name: Stacy Rothwell

Dolby Vision from iPhone 12 Pro

PostTue Oct 27, 2020 12:04 pm

I know it's been less than a week since its release but....

Anyone have a LUT or something to properly put the HEVC Dolby Vision files from the iPhone 12 Pro into Resolve? Interesting, Preview on Mac Big Sur shows the file as HLG, but none of the HLG LUTs look right.

Admitting I know absolutely NOTHING about Dolby Vision, I tried just turning it on in Color Management and it looked like my cat threw up on the screen.

thanks!

Stacy
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jorlow

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Re: Dolby Vision from iPhone 12 Pro

PostMon Nov 02, 2020 2:23 pm

I've been trying to figure this out myself as well. I spent some time Googling and wasn't able to find anything terribly helpful.

Here are a few things I've found:
- If you go to "get info" on a mac, it says "BT.2020 HLG (9-18-9)". (What do the numbers mean?)
- In final cut pro, things look equally bad to start. But, by experimentation I found that (even in a SDR timeline) adding the "HDR Tools" effect to a clip, selecting "HLG to PQ (Rec. 2100)" with a "peak brightness (nits)" setting of 120 results in exactly the same image as what is produced when the phone automatically converts the clip to SDR. (Which happens, for example, when you airdrop it to a mac laptop.) Surprisingly, using the "HDR to Rec 709 SDR" setting in the "HDR Tools" effect did not result in a nice image.
- In Resolve, if I use a colorspace transform from input color space Rec.2020 to Rec.709 and also do a custom curve, I can get really close to what is produced when the phone automatically converts the clip to SDR. None of the input gammas seem to be doing the trick though. And I can't figure out how to reproduce what I stumbled into while using final cut.


I feel like there's something I'm missing here...
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jorlow

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Re: Dolby Vision from iPhone 12 Pro

PostTue Dec 01, 2020 8:50 pm

I found a few videos with suggestions and tried a few things myself, but nothing felt terribly satisfactory. And things looked fairly OK but I just got the feeling I was doing it wrong.

Fast forward to today, I'm trying out the Resolve 17 beta 3 and trying this again. This time I try Resolve's "DaVinci YRGB Color Managed" with the "DaVinci Wide Gamut" and things are working pretty much out of the box. It automatically set the input color space to "Rec.2100 HLG" which looks to be the correct one. And everything else is largely working how I'd expect. Yay!

It's possible using color managed would have made everything equally simple in 16 -- not sure.
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Julian Dahl

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Re: Dolby Vision from iPhone 12 Pro

PostTue Dec 08, 2020 1:59 pm

Did you guys get to the bottom of this?
Same question here, just pulled in a HDR file on the timeline, all blown out.
However i can change the input color space in the media pool for that file to Project 709, but its still washed out compared to viewing it trough Finder.
Mac Pro 7.1 48GB, RX5700 8GB, 12c, OSX 10.15.7
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hunnicuttz

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  • Real Name: Matt Hunnicutt

Re: Dolby Vision from iPhone 12 Pro

PostThu Dec 24, 2020 12:19 am

I am having the same issue, has anyone found out how to fix the iPhone footage in davinci resolve?

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