![]() ![]() With a LUT you can try many different looks on your footage in a matter of seconds. They can be an easy way to give your footage a more polished and professional look with minimal effort. ![]() You might apply a LUT that converts your Log gamma curve to Rec. You could apply one that makes the image black and white, while increasing the contrast. If it was written as a math problem it would be Source + LUT = Result You might apply a LUT that emulates a particular film stock.Īll of the above scenarios are doing the same thing – taking the input RGB values of an image and changing them to different values as defined by the Look Up Table. Log video image with a black and white look up table applied Different Types of LUTs LUTs can serve many utilitarian functions in addition to creating stylized looks for your footage. There are two main types of Look Up Tables – 1D and 3D. Without going into too much detail, here are the basic differences. 1D LUTġD LUTs are used for basic corrections like brightness and contrast. They take the luminance input values in an image and convert them to a different output value. For example every pixel with a value of 8 might be raised to 120 – which would lighten those pixels in the resulting image.ģ of these LUTs can be combined to create a 3x 1D LUT – each color channel would have it’s luminance values adjusted separately from the others. These separate adjustments make it so the 3x 1D LUT is not able to create complex color transformations or saturation adjustments. 3D LUTģD LUTs place both color and luma in 3D space. They can be visualized as a 3 dimensional cube. The X, Y, and Z coordinates of the cube correspond to red green and blue. Calibration LUTs are used to correct errors in a display device.The most common are Calibration, Display, Technical and Creative This allows for complex color interactions and makes them much more suitable for detailed color grades.ġD LUTs can be thought of as being similar to a curves adjustment graphic representation of a 3D LUT Common Uses for LUTs Where the RGB colors overlap in 3D space they blend together to form more colors. ![]() They ensure that your monitor is displaying colors accurately within a specified color space. They allow you to make well informed decisions on how to light a scene on set, or color correct the footage during post production. Display LUTs don’t actually change the image, they only modify how it is displayed on a device.For example a camera recording in a Log profile might be set to display the footage as Rec. 709 on a monitor so it doesn’t look washed out. ![]() Think of these like the color profiles that most TVs have these days – if you change the TV settings from “standard” to “vivid” the image itself is not changed, just the way your TV is presenting it to you. Technical LUTs are mainly used to transform an image from one color space to another.For example a video shot in a Log profile might have a Rec. 709 LUT (HDTV color space) applied during editing, so it can be output to TV. Another example would be to convert a computer generated image from a linear color space into sRGB for web output.Creative LUTs are used to give an image or video a stylized look.This is where the instagram filter analogy from earlier comes in. Log video image with a Kodak 2939 LUT applied When Use LUTs A creative LUT could be applied across an entire video project to give the video a sepia tone, or any other “look” that is desired. When to use a Look Up Table is going to change depending on your needs. The Calibration, Display and Technical LUTs are great tools to add to your film and video making toolkit. They can be a huge help in viewing accurate colors, and to make sure you are viewing your footage in a color space appropriate for its final output. For on set monitoring LUTs can help with proper exposure when shooting in a Log profile, or to give the client an idea what “look” the final video might have.įor utilitarian purposes LUTs are great – the creative LUTs on the other hand are something to use with caution. A Look Up Table is Not a Wonder DrugĮach creative Look Up Table is designed to work under specific conditions for the images it was created with. Just like an instagram filter doesn’t look good on every photo on your phone, a creative LUT won’t look good on every piece of footage you apply it to. Nor will the color adjustments make sense aesthetically for every piece of video content. Over the last few years there has been a rising trend in selling LUT packs online. ![]()
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