Opera on Queens of the Dead
#816575 on #652793
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
1.79:1
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 -13.2
Below Lc 15: the draft treats this as not text.
Light text on a darker ground — the negative sign is the polarity.
Colour difference
ΔE00 24.8
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#cbacbd is the nearest colour of the same hue that passes AA on #652793, 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 1.90:1, ΔE00 24.7.
deuteranopia
Ratio 1.74:1, ΔE00 24.5.
tritanopia
Ratio 1.78:1, ΔE00 14.3.
The weakest of the three is tritanopia, where the two are ΔE00 14.3 apart against 24.8 for a trichromat — still clearly two colours.
Both colours have pages of their own: Opera ·Queens of the Dead · the same pair the other way round ·all pairs