Contrast

Utility methods for calculating contrast given two colors, or calculating a color given one color and a contrast ratio.

Inheritanceobject

Static Methods

Darker(tone: double, ratio: double): double

Returns a tone <= tone that ensures ratio. Returns -1 if ratio cannot be achieved.

DarkerUnsafe(tone: double, ratio: double): double

Unsafe darker version. Returns 0 if ratio cannot be achieved.

Lighter(tone: double, ratio: double): double

Returns a tone >= tone that ensures ratio. Returns -1 if ratio cannot be achieved.

LighterUnsafe(tone: double, ratio: double): double

Unsafe lighter version. Returns 100 if ratio cannot be achieved.

RatioOfTones(toneA: double, toneB: double): double

Returns a contrast ratio, which ranges from 1 to 21.