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# color [](https://travis-ci.org/Qix-/color) > JavaScript library for immutable color conversion and manipulation with support for CSS color strings. ```js var color = Color('#7743CE').alpha(0.5).lighten(0.5); console.log(color.hsl().string()); // 'hsla(262, 59%, 81%, 0.5)' console.log(color.cmyk().round().array()); // [ 16, 25, 0, 8, 0.5 ] console.log(color.ansi256().object()); // { ansi256: 183, alpha: 0.5 } ``` ## Install ```console $ npm install color ``` ## Usage ```js var Color = require('color'); ``` ### Constructors ```js var color = Color('rgb(255, 255, 255)') var color = Color({r: 255, g: 255, b: 255}) var color = Color.rgb(255, 255, 255) var color = Color.rgb([255, 255, 255]) ``` Set the values for individual channels with `alpha`, `red`, `green`, `blue`, `hue`, `saturationl` (hsl), `saturationv` (hsv), `lightness`, `whiteness`, `blackness`, `cyan`, `magenta`, `yellow`, `black` String constructors are handled by [color-string](https://www.npmjs.com/package/color-string) ### Getters ```js color.hsl(); ``` Convert a color to a different space (`hsl()`, `cmyk()`, etc.). ```js color.object(); // {r: 255, g: 255, b: 255} ``` Get a hash of the color value. Reflects the color's current model (see above). ```js color.rgb().array() // [255, 255, 255] ``` Get an array of the values with `array()`. Reflects the color's current model (see above). ```js color.rgbNumber() // 16777215 (0xffffff) ``` Get the rgb number value. ```js color.hex() // #ffffff ``` Get the hex value. ```js color.red() // 255 ``` Get the value for an individual channel. ### CSS Strings ```js color.hsl().string() // 'hsl(320, 50%, 100%)' ``` Calling `.string()` with a number rounds the numbers to that decimal place. It defaults to 1. ### Luminosity ```js color.luminosity(); // 0.412 ``` The [WCAG luminosity](http://www.w3.org/TR/WCAG20/#relativeluminancedef) of the color. 0 is black, 1 is white. ```js color.contrast(Color("blue")) // 12 ``` The [WCAG contrast ratio](http://www.w3.org/TR/WCAG20/#contrast-ratiodef) to another color, from 1 (same color) to 21 (contrast b/w white and black). ```js color.isLight(); // true color.isDark(); // false ``` Get whether the color is "light" or "dark", useful for deciding text color. ### Manipulation ```js color.negate() // rgb(0, 100, 255) -> rgb(255, 155, 0) color.lighten(0.5) // hsl(100, 50%, 50%) -> hsl(100, 50%, 75%) color.lighten(0.5) // hsl(100, 50%, 0) -> hsl(100, 50%, 0) color.darken(0.5) // hsl(100, 50%, 50%) -> hsl(100, 50%, 25%) color.darken(0.5) // hsl(100, 50%, 0) -> hsl(100, 50%, 0) color.lightness(50) // hsl(100, 50%, 10%) -> hsl(100, 50%, 50%) color.saturate(0.5) // hsl(100, 50%, 50%) -> hsl(100, 75%, 50%) color.desaturate(0.5) // hsl(100, 50%, 50%) -> hsl(100, 25%, 50%) color.grayscale() // #5CBF54 -> #969696 color.whiten(0.5) // hwb(100, 50%, 50%) -> hwb(100, 75%, 50%) color.blacken(0.5) // hwb(100, 50%, 50%) -> hwb(100, 50%, 75%) color.fade(0.5) // rgba(10, 10, 10, 0.8) -> rgba(10, 10, 10, 0.4) color.opaquer(0.5) // rgba(10, 10, 10, 0.8) -> rgba(10, 10, 10, 1.0) color.rotate(180) // hsl(60, 20%, 20%) -> hsl(240, 20%, 20%) color.rotate(-90) // hsl(60, 20%, 20%) -> hsl(330, 20%, 20%) color.mix(Color("yellow")) // cyan -> rgb(128, 255, 128) color.mix(Color("yellow"), 0.3) // cyan -> rgb(77, 255, 179) // chaining color.green(100).grayscale().lighten(0.6) ``` ## Propers The API was inspired by [color-js](https://github.com/brehaut/color-js). Manipulation functions by CSS tools like Sass, LESS, and Stylus.
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