![]() Importing Footage in Final Cut Pro X 10.4.8 You need to decide at the outset your output and stick to a compatible format. V-Log vs HLGĪnd the graph demonstrates what I said at the beginning. It is also a bad idea to use V-Log for HLG due to the difference of the log curves. Note with the arrival of RAW video we still lack editors capable to work in 16 bit depth space like photo editors do and currently all processes go through LOG because they need to fit into a 10/12 bits working space. So really in pure mathematical terms the fit of log spaces into Rec709 is not a great idea and should be avoided. We can see that as HLG is also a log gamma with a different ramp up 100% is achieved with even less bits that V-Log. The situation becomes apparent looking at the In/Out Lutted values. Similar to V-LOG HLG does not have a great fit into an SDR space. As PQ is a larger space than that V-Log can produce on a consumer camera we do not have issues of squeezing bits in as PQ accommodates all bits just fine. With the exception of the initial part that for V-Log is linear while PQ is fully logarithmic the curve is almost a straight line. This is more apparent looking at the LUT in / out. You can see that net of an offset the curves are almost identical in shape. However the situation changes if we use V-Log for HDR specifically PQ. We can see that V-Log fills Rec709 with just a bit more than 60% IRE so there will need to be a lot of squeezing to be done to fit it back in and this is the reason why many people struggle with V-Log and the reason why I do not use V-Log for SDR content. Output vs Input diagram for V-LOG and Rec709 Once we apply a LUT the relationship between V-LOG and Rec709 is clearly not linear and only a small parts of bits fit into the target space. Looking at the stop diagram we can appreciate that the curves are not only different but a lot of values differ substantially and this is why we need to use a LUT. Let me explain why this graph produced using the outstanding online application LutCalc show the output input relationship of V-LOG against a standard display gamma for rec709. The process is almost identical but there are some significant differences downstream. This post is not about what is the best standard is just about producing some HDR content. HLG today is really only Tv sets and some smartphones, HDR-10 instead is growing in computer support and is more widely supported. You need to have in mind your target format because Log and HLG are not actually interchangeable. This is limited for example on Mac Os there is no browser support but the Tv app is supported, while on windows you can watch HDR-10 videos on YouTube. The situation has changed as Windows 10 and Mac Os now have HDR-10 support. This comes in two forms:Ĭameras have been shooting HDR since years the issue has been that no consumer operating system or display were capable of displaying it. In order to product HDR clips you need HDR footage. It is possible to work with a non HDR-10 monitor using scopes but is not ideal and only acceptable for HLG and in any case 10 bits is a must. First of all the requirements for HDR at home are:
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