Master Chief on Magic Carpet
#507d2a on #9488be
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
1.51:1
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 12.2
Below Lc 15: the draft treats this as not text.
Dark text on a lighter ground.
Colour difference
ΔE00 45.6
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#172f00 is the nearest colour of the same hue that passes AA on #9488be, at 4.50:1. Only the lightness moved, and some chroma was given up to stay inside sRGB — which is the point: your colour stays recognisably your colour.
And to someone missing a cone
protanopia
Ratio 1.40:1, ΔE00 46.0.
deuteranopia
Ratio 1.58:1, ΔE00 44.7.
tritanopia
Ratio 1.55:1, ΔE00 17.1.
The weakest of the three is tritanopia, where the two are ΔE00 17.1 apart against 45.6 for a trichromat — still clearly two colours.
Both colours have pages of their own: Master Chief ·Magic Carpet · the same pair the other way round ·all pairs