Panorama on Master Chief
#327a88 on #507d2a
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
1.01:1
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 0.0
Below Lc 15: the draft treats this as not text.
Too close to call.
Colour difference
ΔE00 31.8
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#e3faff is the nearest colour of the same hue that passes AA on #507d2a, 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 1.01:1, ΔE00 33.8.
deuteranopia
Ratio 1.02:1, ΔE00 37.2.
tritanopia
Ratio 1.01:1, ΔE00 9.0.
The weakest of the three is tritanopia, where the two are ΔE00 9.0 apart against 31.8 for a trichromat — still two colours, but a closer call than it looks to you.
Both colours have pages of their own: Panorama ·Master Chief · the same pair the other way round ·all pairs