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# Chroma.js
Chroma.js is a tiny JavaScript library (8.5kB) for all kinds of color conversions and color scales.
### Usage
Initiate and manipulate colors:
```javascript
chroma('#D4F880').darken().hex(); // #9BC04B
```
Working with color scales is easy, too:
```javascript
scale = chroma.scale(['white', 'red']);
scale(0.5).hex(); // #FF7F7F
```
Lab/Lch interpolation looks better than than RGB
```javascript
chroma.scale(['white', 'red']).mode('lab');
```
Custom domains! Quantiles! Color Brewer!!
```javascript
chroma.scale('RdYlBu').domain(myValues, 7, 'quantiles');
```
And why not use logarithmic color scales once in your life?
```javascript
chroma.scale(['lightyellow', 'navy']).domain([1, 100000], 7, 'log');
```
### Like it?
Why not dive into the [API docs](https://github.com/gka/chroma.js/blob/master/doc/api.md) (quite short actually), and download [chroma.min.js](https://raw.github.com/gka/chroma.js/master/chroma.min.js) right away.
You can use it in node.js, too!
npm install chroma-js
### Build instructions
To compile the coffee-script source files you have to run ``build.sh``.
To run the tests simply run
vows test/*.coffee
### Similar Libraries / Prior Art
* [Chromatist](https://github.com/jrus/chromatist)
* [GrapeFruit](https://github.com/xav/Grapefruit) (Python)
* [colors.py](https://github.com/mattrobenolt/colors.py) (Python)
* [d3.js](https://github.com/mbostock/d3)
### Author
Chroma.js is written by [Gregor Aisch](http://driven-by-data.net).
### License
Released under [BSD license](http://opensource.org/licenses/BSD-3-Clause).
Versions prior to 0.4 were released under [GPL](http://www.gnu.org/licenses/gpl-3.0).
### Known issues
* HSI color conversion is experimental and produces weird results sometimes
### Further reading
* [How To Avoid Equidistant HSV Colors](https://vis4.net/blog/posts/avoid-equidistant-hsv-colors/)
* [Mastering Multi-hued Color Scales with Chroma.js](https://vis4.net/blog/posts/mastering-multi-hued-color-scales/)
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