Shadow Play on Florida’s Alligator
#2d1403 on #664422
Body text at this size
And the smaller size most interfaces actually use for paragraphs — the size that decides whether a pair is usable.
Caption text, which almost nothing passes.
WCAG 2.1
1.99:1
Fails AA
Not AAA (7:1). Swapping the two colours gives the same number — the ratio does not know which is the text.
APCA
Lc 12.3
Below Lc 15: the draft treats this as not text.
Dark text on a lighter ground.
Colour difference
ΔE00 17.5
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#d6b49e is the nearest colour of the same hue that passes AA on #664422, at 4.50:1. Only the lightness moved — which is the point: your colour stays recognisably your colour.
And to someone missing a cone
protanopia
Ratio 1.92:1, ΔE00 17.0.
deuteranopia
Ratio 2.03:1, ΔE00 17.3.
tritanopia
Ratio 2.11:1, ΔE00 19.4.
The weakest of the three is protanopia, where the two are ΔE00 17.0 apart against 17.5 for a trichromat — still clearly two colours.
Both colours have pages of their own: Shadow Play ·Florida’s Alligator · the same pair the other way round ·all pairs