Vintage Bloom on Panorama
#c0b0d0 on #327a88
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
2.42:1
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 -34.3
Clears Lc 30 — the floor: below this the draft considers text not readable at any size.
Light text on a darker ground — the negative sign is the polarity.
Colour difference
ΔE00 37.7
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#f9f3ff is the nearest colour of the same hue that passes AA on #327a88, 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 2.20:1, ΔE00 20.7.
deuteranopia
Ratio 2.56:1, ΔE00 24.8.
tritanopia
Ratio 2.49:1, ΔE00 49.4.
The weakest of the three is protanopia, where the two are ΔE00 20.7 apart against 37.7 for a trichromat — still clearly two colours.
Both colours have pages of their own: Vintage Bloom ·Panorama · the same pair the other way round ·all pairs