![]() Introduction To LUTCalc Part 2 – Customisation from Ben Turley on Vimeo. Introduction To LUTCalc Part 1 – Basic Options from Ben Turley on Vimeo. The following two-part introductory videos cover the basic operation of LUTCalc for generating LUTs and the customizations and effects you can do with the app. There are many online free sources out there that provide different custom LUTs that you can download, however if you like to create and custom your own LUTs here is a great tool called LUT Calculator that you might find useful and implement in your daily Log workflow. LUTs also serve as a great reference point when it comes to colour correcting and colour grading of your footage later in post. LUTs are an important ingredient in the Log workflow as they essentially interpret your Log camera signal in a certain way thus outputting the given colour information to your monitor without affecting the recorded footage. More and more camera manufacturers are implementing this feature in their entry-level models which makes this option more accessible not only to seasoned professionals and high-end productions but also for independent filmmakers and smaller production facilities. What it mainly demonstrates is that the SDR copy can be colorful and retain much of the sparkle of the HDR version.Shooting in S-Log is one of the most common traits of achieving cinematic look these days and a great way to optimise the imaging capabilities and capture full dynamic range of the latest generation camera sensors. Following is a link to my most recent YouTube HDR upload in HLG. ![]() YouTube has a help topic for content creators on how to create and attach a cube lut to your upload. In either case of HDR10 or HLG, the YouTube SDR copy will otherwise appear overly flat and comparatively lifeless primarily because the copy will be in 2020 color which will look flat on 709 monitor. ![]() This is an especially important step since currently most viewers will be watching the videos in SDR. For either format, you can attach a cube lut to your upload to give hints to the YouTube encoder how the SDR copy should look. With either one, YouTube will create an SDR copy. Since it is scene based gamma not display targeted nits, as your highlights stretch into the high brightness range the mid range rolls up as well, a more familiar 709 type of look that looks great in any light, less specular, you don't have to worry so much about skin tones blooming or makeup foundation jumping off the face into a separate bright color layer as can happen with improperly graded HDR10, but still an enhanced dynamic range viewing experience. It's much simpler to grade, looks fantastic but it is a different look. HLG does not have the benefit but also does not have the problem. The benefit has companion worries just mentioned, skin tones reaching too high. The benefit of greater color volume at high brightness nits is exclusive to PQ st2084 EOTF, thus HDR10, Dolby Vision and Technicolor. You need a HDR10 grading monitor or you'll be redoing it all trial and error scene by scene. The ability to separate, delineate specular highlights that can and should be pumped up to 1000+ nits has to be done carefully to prevent non-wanted features like skin tones from reaching the upper zones above 100 nits. Your talent will want you fired if you let that happen. This can be very realistic, as well there's more color volume retained as luminance is raised, which is another caveat to be careful about if trying to grade HDR10 on a SDR monitor, certain features like women's makeup foundation appears prominent as a separate layer if skin tones are put up into the upper HDR zones above 100 nits. Highlights in HDR10 are more specular in nature. HDR10 is more cinema like, retains more shadow detail, to see it consistently means viewing in darkened viewing conditions. So either get a proper HDR10 monitor for grading or give up on that idea and use HLG which can look arguably better in some situations like viewing output in brightly lit viewing rooms, sports events, documentary, short form. That you can grade on a 709 monitor with a reasonable expectation the graded output for HLG will be close. The easiest path to YouTube HDR is to forget about HDR10 and do HLG instead. You'll be creating luts scene by scene because it uses display targeted brightness instead of scene gamma. Doing HDR10 without a proper HDR10 capable monitor will be difficult.
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