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color:contrast_ratio(color)

Since: Version 20220807-113146-c2fee766

The functionality described in this section requires version 20220807-113146-c2fee766 of wezterm, or a more recent version.

Computes the contrast ratio between the two colors.

> wezterm.color.parse("red"):contrast_ratio(wezterm.color.parse("yellow"))
1
> wezterm.color.parse("red"):contrast_ratio(wezterm.color.parse("navy"))
1.8273614734023298

The contrast ratio is computed by first converting to HSL, taking the L components, and diving the lighter one by the darker one.

A contrast ratio of 1 means no contrast.

The maximum possible contrast ratio is 21:

> wezterm.color.parse("black"):contrast_ratio(wezterm.color.parse("white"))
21