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Luma Contrast Card

2160 × 3840 · display at 100% · photograph, don't eyeball

FULL RANGE RGB REQUIRED
GROUND MUST MEASURE 255,255,255
VIEW FROM 1.5 – 3 m

01 · Ground truth what white and black actually do in the case

#FFFFFF · ground

#808080 · mid

#000000 · full ink

02 · Luminance floor first patch you can separate from ground wins

03 · Type on ground 22px mono, the real label size

04 · Type weight & size halation eats stems — weight beats size

05 · Knockout plates contrast from emitted light, independent of ground

06 · Rules thinnest line that survives the diffuser

07 · Accent brass against ground and as a plate

Protocol

01 — Set up

Full-screen at 100%, no scaling. Confirm the GPU is on full-range RGB. Shoot the room lighting you will actually deploy in — a dark studio will lie to you.

02 — Record

Photograph from 1.5 m and 3 m, exposure locked, no HDR. Note the lowest readable row in 02, 03 and 06. That's your floor.

03 — Decide

Floor under 25% → Luma treatment. Floor over 40%, or section 01 ground reads tinted → Plate. Then set the viewer to match.