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Jan 12, 2024
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greys = t => `hsl(0, 0%, ${100 - t * 100}%)`
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rainbow = t => `hsl(${t * 360}, 100%, 50%)`
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d3scales = require("d3-scale-chromatic@1", "d3-interpolate@1")
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ramp(scales.cool)
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ramp(scales.turbo)
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ramp(scales.inferno)
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ramp(scales.warm)
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procScale = (a, b, c, d) => {
const channel = (i, t) => Math.max(Math.min((a[i] + b[i] * Math.cos(Math.PI * 2 * (c[i] * t + d[i]))) * 255, 255), 0) | 0
return t => `rgb(${channel(0, t)}, ${channel(1, t)}, ${channel(2, t)})`
}
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ramp(scales.procA)
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ramp(scales.procB)
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ramp(scales.procC)
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ramp(scales.procD)
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ramp(scales.procE)
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ramp(scales.procF)
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ramp(scales.procG)
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ramp(scales.procH)
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ramp(randomProc())
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ramp(scales.geoffrey)
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imageData = readPixels('https://source.unsplash.com/featured?forest', { w: width, h: width / 2.5 , format: 'hsl', fit: true })
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extractPalette = async uri => {
const palette = await Vibrant.from(uri).getPalette()
return Object.values(palette).map(d => d.rgb.reduce((acc, n) => acc + (n|0).toString(16).padStart(2, '0'), '#'))
}
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paletteFromImage = extractPalette(uri)
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atcq = async (url, maxColors = 12) => {
const imageData = await readPixels(url)
return ATCQ.quantizeSync(imageData.pixels, { maxColors }).map(c => rgbToHex(c.map(d => d | 0)))
}
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paletteFromImage2 = await atcq(uri, 6)
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lerpColor([255, 10, 20], [255, 135, 67], 0.5)
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hexToRgb('#7abdff')
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hexToRgb('#222')
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rgbToHex([255, 10, 51])
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rgbToHsl([255, 10, 51])
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hslToRgb([349.9591836734694, 1, 0.5196078431372549])
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rgbToHsv([255, 10, 51])
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hsvToRgb([349.9591836734694, 0.9607843137254902, 1])
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contrastYiq = ([r,g,b]) => {
const yiq = (r * 299 + g * 587 + b * 114) / 1000;
return yiq >= 128 ? 0x0 : 0xffffff;
}
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contrastYiq([255, 255, 255])
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contrastYiq([200,200,200])
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rgbToGrayscaleAverage = ([r,g,b]) => {
const gray = (r + g + b) / 3 >> 0
return [gray, gray, gray]
}
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rgbToGrayscaleAverage([255,0,0])
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rgbToGrayscaleLuma = ([r,g,b]) => {
const gray = (r * 0.299 + g * 0.587 + b * 0.114) >> 0
return [gray, gray, gray]
}
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rgbToGrayscaleLuma2 = ([r,g,b]) => {
const gray = (r * 0.2126 + g * 0.7152 + b * 0.0722) >> 0
return [gray, gray, gray]
}
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Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
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