import { rgb2hue, rgb2whiteness, rgb2value } from './util';
|
import { hsl2rgb } from './rgb-hsl';
|
|
/* Convert between RGB and HWB
|
/* ========================================================================== */
|
|
export function rgb2hwb(rgbR, rgbG, rgbB, fallbackhue) {
|
const hwbH = rgb2hue(rgbR, rgbG, rgbB, fallbackhue);
|
const hwbW = rgb2whiteness(rgbR, rgbG, rgbB);
|
const hwbV = rgb2value(rgbR, rgbG, rgbB);
|
const hwbB = 100 - hwbV;
|
|
return [hwbH, hwbW, hwbB];
|
}
|
|
export function hwb2rgb(hwbH, hwbW, hwbB, fallbackhue) {
|
const [ rgbR, rgbG, rgbB ] = hsl2rgb(hwbH, 100, 50, fallbackhue).map(
|
v => v * (100 - hwbW - hwbB) / 100 + hwbW
|
);
|
|
return [ rgbR, rgbG, rgbB ];
|
}
|
|
/*
|
|
References
|
----------
|
|
- https://www.w3.org/TR/css-color-4/#hwb-to-rgb
|
- http://alvyray.com/Papers/CG/hwb2rgb.htm
|
|
/* ========================================================================== */
|
