Vega-Lite LAB Color Space / Vega

Data Visualization Languages & Tools

Published

Edited

Mar 25, 2021

1 fork

3 stars

viewof view = vl.markSquare({size: 4, opacity: 1})

.data(vl.data().name('colors')) // empty named dataset, we will populate below!

.encode(

vl.x().fieldQ('0').scale({domain: [-100, 100]}).title('a*'),

vl.y().fieldQ('1').scale({domain: [-120, 100]}).title('b*'),

vl.color().fieldN('2').scale(null)

)

.width(400).height(440)

.render()

// update view data when backing colors update

view.data('colors', colors).runAsync(), md`${colors.length} colors!`

colors = {

const inGamut = v => (0 <= v && v <= 255);

const data = [];

// generate full grid of a-b coordinates

d3.cross(d3.range(-100, 101, 1), d3.range(-120, 101, 1))

.forEach(([a, b]) => {

// generate LAB color, keep those within RGB gamut

const c = d3.rgb(d3.lab(L, a, b));

if (inGamut(c.r) && inGamut(c.g) && inGamut(c.b)) {

data.push([a, b, c + ''])

}

});

return data;

}

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