28:null 29:["$","title",null,{"children":"Wavelength to RGB Converter | Toph & Visnu Stream | Observable"}] 2e:T56c,// Copied from https://www.johndcook.com/wavelength_to_RGB.html function wavelengthToRGB(input) { const w = parseFloat(input); let red, green, blue, factor; if (w >= 380 && w < 440) { red = -(w - 440) / (440 - 380); green = 0.0; blue = 1.0; } else if (w >= 440 && w < 490) { red = 0.0; green = (w - 440) / (490 - 440); blue = 1.0; } else if (w >= 490 && w < 510) { red = 0.0; green = 1.0; blue = -(w - 510) / (510 - 490); } else if (w >= 510 && w < 580) { red = (w - 510) / (580 - 510); green = 1.0; blue = 0.0; } else if (w >= 580 && w < 645) { red = 1.0; green = -(w - 645) / (645 - 580); blue = 0.0; } else if (w >= 645 && w < 781) { red = 1.0; green = 0.0; blue = 0.0; } else { red = 0.0; green = 0.0; blue = 0.0; } // Let the intensity fall off near the vision limits if (w >= 380 && w < 420) factor = 0.3 + (0.7 * (w - 380)) / (420 - 380); else if (w >= 420 && w < 701) factor = 1.0; else if (w >= 701 && w < 781) factor = 0.3 + (0.7 * (780 - w)) / (780 - 700); else factor = 0.0; const gamma = 0.8; const R = red > 0 ? 255 * Math.pow(red * factor, gamma) : 0; const G = green > 0 ? 255 * Math.pow(green * factor, gamma) : 0; const B = blue > 0 ? 255 * Math.pow(blue * factor, gamma) : 0; return "#" + decimalToHex(R) + decimalToHex(G) + decimalToHex(B); }2f:[] 2c:{"id":"9623d79f29618695","slug":null,"title":"Wavelength to RGB Converter","thumbnail":"ded1c39d3efceb808da1f0cfc51f9ca7d4fa8d74cbc1669b1c4a70dd5f62d044","access_level":"public","create_time":"$D2022-09-02T18:21:48.602Z","update_time":"$D2022-09-02T19:06:48.315Z","view_time":null,"first_public_time":"$D2022-09-02T18:21:48.602Z","fork":false,"stars":4,"starred":false,"owner":{"type":"team","id":"f0b571ae609f9fba","login":"tv-stream-dream-team","name":"Toph & Visnu Stream","avatar_url":"https://avatars-next.observableusercontent.com/158d3860b6b72c0582146cf4279ffd799932eed88ad93d5ecdbc55bdd28236b4","tier":"starter_2024"},"version":125,"publish_version":null,"role":null,"authored":false,"authors":[{"type":"individual","id":"0bb2842b01e0c652","login":"tophtucker","name":"Toph Tucker","avatar_url":"https://avatars-next.observableusercontent.com/3706c31a8f9c59bb716c022c04b9c073144cd1368b78ac85f49139be6c93c34e","tier":null}],"members":[{"type":"individual","id":"0bb2842b01e0c652","login":"tophtucker","name":"Toph Tucker","avatar_url":"https://avatars-next.observableusercontent.com/3706c31a8f9c59bb716c022c04b9c073144cd1368b78ac85f49139be6c93c34e","tier":null,"role":"editor"},{"type":"team","id":"f0b571ae609f9fba","login":"tv-stream-dream-team","name":"Toph & Visnu Stream","avatar_url":"https://avatars-next.observableusercontent.com/158d3860b6b72c0582146cf4279ffd799932eed88ad93d5ecdbc55bdd28236b4","tier":"starter_2024","role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"subscribed":null,"forks":3,"collection":null,"type":"notebook","body":{"title":"Wavelength to RGB Converter","cells":[{"id":0,"value":"# Wavelength to RGB Converter\n## Ripping off [John D. Cook](https://www.johndcook.com/wavelength_to_RGB.html)\n","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined"},{"id":45,"value":"

${wavelength} nm is ${hue}

","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined"},{"id":31,"value":"hue = wavelengthToRGB(wavelength)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":19,"value":"viewof wavelength = Inputs.range(visibleSpectrum, {label: \"Wavelength (nm)\", value: 400})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":64,"value":"visibleSpectrum = [380, 780]","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":85,"value":"Plot.plot({\n marks: [\n Plot.dot(samples, {\n x: \"wavelength\",\n y: \"hue\",\n fill: (d) => `hsl(${d.hue}, 100%, 50%)`\n }),\n Plot.ruleX([wavelength])\n ],\n color: { type: \"identity\" }\n})","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":66,"value":"samples = d3\n .range(...visibleSpectrum)\n .map((wavelength) => ({\n wavelength,\n hue: d3.hsl(wavelengthToRGB(wavelength)).h\n }))","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":102,"value":"hueToWavelength = d3.scaleLinear(samples.map(d => d.hue), samples.map(d => d.wavelength))","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":4,"value":"$2e","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":5,"value":"function decimalToHex(d) {\n d = Math.round(d);\n var hex = d.toString(16);\n while (hex.length < 2) {\n hex = \"0\" + hex;\n }\n return hex;\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"}],"files":"$W2f","stdlib":"1","titling":"auto"}} 2d:"$2c:body"