3D lookup table

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In the film industry, 3D lookup tables (3D LUTs) are used to map one colour space to another. They are commonly used to calculate preview colors for a monitor or digital projector of how an image will be reproduced on another display device, typically the final digitally projected image or release print of a movie. A 3D LUT is a 3D lattice of output RGB color values that can be indexed by sets of input RGB colour values. Each axis of the lattice represents one of the three input color components and the input color thus defines a point inside the lattice. Since the point may not be on a lattice point, the lattice values must be interpolated; most products use trilinear interpolation.[1]

3D LUTs are used extensively in the movie production chain, as part of the Digital Intermediate process.

Cubes may be of various sizes and bit depths. Often 17×17×17 cubes are used as 3D LUTs. The most common practice is to use RGB 10-bit/component log images as the input to the 3D LUT. Output is usually RGB values that are to be placed unchanged into a display device's buffer.

Modern graphics cards have direct support for 3D LUTs, allowing entire HD images to be processed at 60 fps or faster.

See also[edit]

References[edit]

  1. ^ Selan, Jeremy (2004). "Using Lookup Tables to Accelerate Color Transformations" GPU Gems 2, Chapter 24. http://http.developer.nvidia.com/GPUGems2/gpugems2_chapter24.html ISBN 0-321-33559-7

External links[edit]

Some systems for 3D LUT Generation[edit]

  • ArgyllCMS A cross platform Color Management System and toolkit.
  • CalMan Studio Monitor Calibration 3D LUT Files for Video and Image Editing Software
  • Cine-tal cineSpace 3D LUT generation software for film color management
  • CocoaLUT is a Cocoa framework for importing, exporting, and manipulating 3D LUTs.
  • DispcalGUI DispcalGUI is a graphical user interface for the Argyll CMS display calibration utilities.
  • FilmLight Truelight color management system
  • Light Illusion LightSpace CMS for full colour management.
  • LUT-box in line color transformation.
  • Adobe Photoshop CC 2014 new feature: Export Color Lookup Tables.

Some systems supporting 3D LUTs[edit]