Visually uniform color transformations through HSLuv color space
UniTransform is a library that allows you to perform common color operations (like darken or saturate).
This library is unique in that instead of performing these functions in HSL color space, they are done in HSLuv, meaning that the same function performed on two different colors will have visually consistent results.
The color modification functions provided take any valid CSS color string as input and output the transformed color as hexadecimal.
You can read more about HSLuv and perceptually uniform colorspaces here.
// color inputs can be any valid CSS color string
darken(color, 15); // returns hex
desaturate(color, 15); // returns hex
lighten(color, 15); // returns hex
rotate(color, 15); // returns hex
saturate(color, 15); // returns hex
getHsluv(color); // returns array of floats
getHue(color); // returns float from 0 to 360
getLightness(color); // returns float from 0 to 100
getSaturation(color); // returns float from 0 to 100
setHue(color, 180); // returns hex
setLightness(color, 50); // returns hex
setSaturation(color, 50); // returns hex
// returns color1 with specified properties replaced the properties of color2
// accepts a subset of "hsl" as properties, returns hex
useProperties(color1, color2, properties);