Grade: a look named as a key and resolved to a transform of a picture's own channels. Levels, curves, exposure, hue and saturation and lookup tables are the machinery beneath it, but a grade is not those numbers — it is the name, stored, and resolved at play time into a per-channel transform. Keys stored and numbers derived, the stage's law for motion, applied here to colour. A grade track carries the look across a row of shots, so a sequence changes its look shot by shot without one channel figure entering the board. A look key, a channel value and a moment in, the resolved per-channel transform out.
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