C increases →, L increases ↑.
Bright pixels pass the background threshold and are distinguishable from regular text
(|Lc| ≥ 15 vs #000 on light, #ccc on dark);
dimmed = in-gamut but fails; checkerboard = outside sRGB gamut.
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Light bg #eee
Dark bg #000
Both
Click a point on any canvas to preview that colour.