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iNDexed Image format - consider itself lucky.
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README.md

ndi

iNDexed Image format - consider itself lucky.

This is the Go reference for ndi v1.

Format

Header

magic string: ndi1

image width: uint16

LUT/palette size: uint8 (maximum of 255 colors)

zero pad until 12 bytes

ndi1 WWL0 0000

LUT (lookup table) / palette

3x uint8 in RGB order, per LUT index.

zero pad: 32 bits

Pixels

a uint8 per pixel, referencing the color within the LUT, zero indexed.

Decoding Quirks

Pixels should modulo their value with LUT size. A pixel referencing index 0xEF when only 10 colors exist in the LUT, 0xEF % 10 is the correct interpretation.