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What’s the Distinction Between a 17grid 3D LUT and a 65grid 3D LUT?

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LUTs are a robust colour grading asset. They’ll get you from level A to level B with minimal effort and excellent reliability. Even when you don’t wish to use them in your principal grade, they are often a useful a part of most workflows since they may give you a good preview on set or in submit. And, when you didn’t know, there are literally various kinds of 3D LUTs – 17grid, 33grid, and 65grid. What’s the distinction?

Filmmaker Carlos Quintero takes on this query, which many individuals in all probability have by no means requested. In case you are seeking to begin making your individual LUTs or just wish to higher perceive how they work it is best to begin studying what these variations really imply.

LUTs, or Look-Up Tables, are a quite simple software in apply. They inform the software program find out how to take authentic footage and apply a grade to the footage to offer it a definite look. It does this by translating anticipated colour and luminance values to a brand new picture. Mostly, LUTs are used to take log or flat pictures and add distinction or saturation to make them look “proper.”

Inside LUTs there are 1D and 3D LUTs – these variations are for an additional video. Most filmmakers will probably be utilizing the extra widespread 3D LUT which is present in .dice recordsdata. 3D LUTs can be found within the aforementioned 17grid, 33grid, and 65grid variants. What do these imply? At their easiest, it’s the stage of element. So as from good to greatest you’re looking at 17, 33, 65. Makes some sense.

Picture Credit score: Carlos Quintero

Since LUTs aren’t good – they don’t know what they’re – they’re making pretty broad modifications. That’s how they take the anticipated look of log pictures and convert them into one thing like Rec.709.

17grid 3D LUTs mainly simply take an anticipated place to begin and converts it to a set endpoint. For extra restricted footage like 8-bit log, this can be a viable choice. 33grid choices start so as to add extra particular directions to verify the modifications are extra correct.

That is what you need to be contemplating utilizing for manufacturing displays on set. Nevertheless, it nonetheless isn’t good as a result of it doesn’t have a whole set of data on gradients within the midtones. It would nail the highest and backside finish, however the center is necessary.

Picture Credit score: Carlos Quintero

Making use of related corrections with a 65grid 3D LUT makes use of much more factors to do the conversion and seems to supply extra correct ends in Quintero’s assessments. So, in abstract, the distinction between the 17, 33, and 65grid variations is what number of info factors they use to find out find out how to make their conversions, that are actually simply guesses.

The extra you have got the extra dependable the conversion will probably be, however you don’t all the time want that stage of element relying in your footage.

In case you are seeking to create your individual LUTs utilizing software program like DaVinci Resolve that is helpful info and might clarify what you’re getting with the choices offered to you.

[source: Carlos Quintero]

Order Hyperlinks:

  • Blackmagic Design DaVinci Resolve Studio (B&H, Amazon)

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