DJI Mavic 2 D-Log M for Color Space Transform?

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Arian Wichmann

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DJI Mavic 2 D-Log M for Color Space Transform?

PostSat Feb 16, 2019 10:37 pm

Hi there,

I got myself a Mavic 2 Pro and it can record in D-Log M. DJI provides a LUT for D-Log M to Rec709 but I recently learned of the color space transform plugin which I wanted to use in the future for converting color spaces etc. and I was quite happy to find DJI D-Gamut for Input Color Space and DJI D-log for Input Gamma. But those two options do not give the same result as DJIs Lut.

So I do believe the D-Log M to be a bit different to D-Log. Would it be possible to include this new LOG Version into the color space transform plugin?
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waltervolpatto

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Re: DJI Mavic 2 D-Log M for Color Space Transform?

PostSun Feb 17, 2019 12:29 am

Arian Wichmann wrote:Hi there,

I got myself a Mavic 2 Pro and it can record in D-Log M. DJI provides a LUT for D-Log M to Rec709 but I recently learned of the color space transform plugin which I wanted to use in the future for converting color spaces etc. and I was quite happy to find DJI D-Gamut for Input Color Space and DJI D-log for Input Gamma. But those two options do not give the same result as DJIs Lut.

So I do believe the D-Log M to be a bit different to D-Log. Would it be possible to include this new LOG Version into the color space transform plugin?


if you have the white paper it is possible to build a DCTL that mathematically transform to a known color space (like LogC)
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waltervolpatto

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Re: DJI Mavic 2 D-Log M for Color Space Transform?

PostSun Feb 17, 2019 12:31 am

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Arian Wichmann

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Re: DJI Mavic 2 D-Log M for Color Space Transform?

PostWed Feb 20, 2019 4:46 pm

Okay, that sounds like a reasonable idea, although I have no idea how to do it. Might just have to teach myself about DCTL. But thank you for the time to look up that paper!
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waltervolpatto

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Re: DJI Mavic 2 D-Log M for Color Space Transform?

PostWed Feb 20, 2019 7:55 pm

Arian Wichmann wrote:Okay, that sounds like a reasonable idea, although I have no idea how to do it. Might just have to teach myself about DCTL. But thank you for the time to look up that paper!


Also, one of the color science in our facilities suggested that being close enough to arri logc you can flag it as such and color the difference.
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Arian Wichmann

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Re: DJI Mavic 2 D-Log M for Color Space Transform?

PostMon Feb 25, 2019 9:50 am

I've looked a bit further into this.

The whitepaper you found is for the D-Log Gamut but the Mavic 2 uses a similar but different Gammut called D-Log M.

So far there has only been a LUT to convert to Rec.709 that has been released by DJI but no whitepaper (https://forum.dji.com/thread-163592-2-1.html).

Just for further reference if someone stumbles upon this.

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