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Asked: 2026-06-01T23:19:39+00:00

Where might lookup tables be located when used for reference within images? I understand

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Where might lookup tables be located when used for reference within images?

I understand the theory behind how LUTs work with images – i.e. 8-bit colour images storing sets of bytes instead of colour and looking up the colour values in the associated LUT to produce colour images – but I have never been told where said LUT might be stored/located.

Might they be stored elsewhere on a server and referred to in the same way that a CSS stylesheet might be stored in a web directory alongside a website, for example, or is there some other way that they are stored?

Thanks.

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1 Answer

  1. Editorial Team

    LUTs, or “color palettes” are typically stored in the image file header.

    Check out the PCX file format for a simple example. It’s usually just a list of 256×3 bytes, i.e. one byte for red component, one for green, one for blue, repeat for each 256 color index.

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