Cover of Night on Porcini
#494e4f on #d9ae86
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
4.16:1
Large text only
Not AAA (7:1). Swapping the two colours gives the same number — the ratio does not know which is the text.
APCA
Lc 47.6
Clears Lc 45 — large or heavy display 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
#44494a is the nearest colour of the same hue that passes AA on #d9ae86, 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 3.90:1, ΔE00 42.1.
deuteranopia
Ratio 4.31:1, ΔE00 45.6.
tritanopia
Ratio 4.57:1, ΔE00 58.2.
The weakest of the three is protanopia, where the two are ΔE00 42.1 apart against 45.6 for a trichromat — still clearly two colours.
Both colours have pages of their own: Cover of Night ·Porcini · the same pair the other way round ·all pairs