Corrosive Green on Dwarf Fortress
#54d905 on #1d0200
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
10.66:1
Passes AA for body text
AAA too. Swapping the two colours gives the same number — the ratio does not know which is the text.
APCA
Lc -67.7
Clears Lc 60 — headlines and other larger text.
Light text on a darker ground — the negative sign is the polarity.
Colour difference
ΔE00 78.4
different colours
Above 10 — related only in the sense that both are colours.
Nothing to fix
This pair already clears 4.5:1, so #54d905 can stay exactly as it is. Check another pair.
And to someone missing a cone
protanopia
Ratio 12.18:1, ΔE00 76.4.
deuteranopia
Ratio 9.87:1, ΔE00 67.1.
tritanopia
Ratio 8.75:1, ΔE00 65.9.
The weakest of the three is tritanopia, where the two are ΔE00 65.9 apart against 78.4 for a trichromat — still clearly two colours.
Both colours have pages of their own: Corrosive Green ·Dwarf Fortress · the same pair the other way round ·all pairs