Barry Goyette
lvl.4
Flight distance : 14928 ft
United States
Offline
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DJI has unfortunately confused the issue by allowing you to record RAW in D-Log. The problem is that it's not really what's happening. RAW is always RAW...and whatever preview you are seeing in ACR, or Resolve ETC is the result of a metadata tag that is telling your computer how to render a preview of the image (RAW images are horrible to look at without a profile attached). D-Log is a gamma applied during Debayering and conversion to ProRes and H264(sort of). Linear Gamma (Rec.709) is the same and is normally how Raw images are viewed. The main purpose of a LOG Gamma is to allow for RAW-like exposure adjustment of (generally compressed) non-RAW images, as the distribution of code values is more even throughout the tonal range than linear encoding, and thus can sort of do an end-run around the problem of adjusting lower bit (10) footage. RAW images generally exist in a higher bit level (12), and thus don't require this redistribution of code values for simple exposure changes in a RAW converter like ACR or Resolve.
It's not uncommon to think that the "flat" LOG rendering means that the file has more dynamic range, but that's not the case, especially when it comes to comparing to a RAW File. In RAW, there is a huge amount of DR being hidden by the Linear Gamma preview, and all you have to do to expose it is to start adjusting various sliders (exposure, highlight, shadow, etc). If I'm being opaque here, lets just say that there is no real benefit to handling RAW files in LOG, and it's not really a standard way of dealing with it. Linear is the generally considered the "correct" way to work with raw, if there is such a thing.
Now...DJI has recently made available a "reverse" LUT, that will convert RAW CDNG to LOG. I haven't the faintest reason why. But if it's what you want, go to the X7 or X5s Download pages and grab the "Linear to D-Log" LUT. It works in Resolve and Premiere. |
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