2b:null 2c:["$","title",null,{"children":"ColorBlindLib | Sumant Pattanaik | Observable"}] 31:T119c,convertRGB = function (){ // Following Code is adapted from hcirn_colorblind_simulation.js available from // https://github.com/MaPePeR/jsColorblindSimulator. // The file needed a couple of missing declaration of varying variables and the functions in the file has been encapsulated into a single function covertRGB. // .... // The original code in github repository itself has been grabbed from http://web.archive.org/web/20090318054431/http://www.nofunc.com/Color_Blindness_Library // Added 2 missing } to fix code. // Used Lookup table for Math.pow(<>/255, gamma) /* This function allows you to see what colors look like to those who are color blind. Use the fBlind[] in order to convert. For instance: fBlind['Tritanomaly'](RGB) would convert RGB[] into Tritanomaly. */ /* The Color Blind Simulation function is copyright (c) 2000-2001 by Matthew Wickline and the Human-Computer Interaction Resource Network ( http://hcirn.com/ ). It is used with the permission of Matthew Wickline and HCIRN, and is freely available for non-commercial use. For commercial use, please contact the Human-Computer Interaction Resource Network ( http://hcirn.com/ ). */ const rBlind = { protan: {cpu: 0.735, cpv: 0.265, am: 1.273463, ayi: -0.073894}, deutan: {cpu: 1.14, cpv: -0.14, am: 0.968437, ayi: 0.003331}, tritan: {cpu: 0.171, cpv: -0.003, am: 0.062921, ayi: 0.292119}}; const fBlind = { Normal: function (v) { return (v); }, Protanopia: function (v) { return (blindMK(v, 'protan')); }, Protanomaly: function (v) { return (anomylize(v, blindMK(v, 'protan'))); }, Deuteranopia: function (v) { return (blindMK(v, 'deutan')); }, Deuteranomaly: function (v) { return (anomylize(v, blindMK(v, 'deutan'))); }, Tritanopia: function (v) { return (blindMK(v, 'tritan')); }, Tritanomaly: function (v) { return (anomylize(v, blindMK(v, 'tritan'))); }, Achromatopsia: function (v) { return (monochrome(v)); }, Achromatomaly: function (v) { return (anomylize(v, monochrome(v))); } }; const powGammaLookup = Array(256); (function () { for (let i = 0; i < 256; i++) { powGammaLookup[i] = Math.pow(i / 255, 2.2); } })(); function blindMK(rgb,t) { const gamma = 2.2; const wx = 0.312713; const wy = 0.329016; const wz = 0.358271; const b = rgb[2]; const g = rgb[1]; const r = rgb[0]; const cr = powGammaLookup[r]; const cg = powGammaLookup[g]; const cb = powGammaLookup[b]; // rgb -> xyz const cx = (0.430574 * cr + 0.341550 * cg + 0.178325 * cb); const cy = (0.222015 * cr + 0.706655 * cg + 0.071330 * cb); const cz = (0.020183 * cr + 0.129553 * cg + 0.939180 * cb); const sum_xyz = cx + cy + cz; var cu = 0; var cv = 0; if (sum_xyz != 0) { cu = cx / sum_xyz; cv = cy / sum_xyz; } var nx = wx * cy / wy; var nz = wz * cy / wy; var clm; var dy = 0; if (cu < rBlind[t].cpu) { clm = (rBlind[t].cpv - cv) / (rBlind[t].cpu - cu); } else { clm = (cv - rBlind[t].cpv) / (cu - rBlind[t].cpu); } var clyi = cv - cu * clm; var du = (rBlind[t].ayi - clyi) / (clm - rBlind[t].am); var dv = (clm * du) + clyi; var sx = du * cy / dv; var sy = cy; var sz = (1 - (du + dv)) * cy / dv; // xzy->rgb var sr = (3.063218 * sx - 1.393325 * sy - 0.475802 * sz); var sg = (-0.969243 * sx + 1.875966 * sy + 0.041555 * sz); var sb = (0.067871 * sx - 0.228834 * sy + 1.069251 * sz); var dx = nx - sx; var dz = nz - sz; // xzy->rgb let dr = (3.063218 * dx - 1.393325 * dy - 0.475802 * dz); let dg = (-0.969243 * dx + 1.875966 * dy + 0.041555 * dz); let db = (0.067871 * dx - 0.228834 * dy + 1.069251 * dz); var adjr = dr ? ((sr < 0 ? 0 : 1) - sr) / dr : 0; var adjg = dg ? ((sg < 0 ? 0 : 1) - sg) / dg : 0; var adjb = db ? ((sb < 0 ? 0 : 1) - sb) / db : 0; var adjust = Math.max( ((adjr > 1 || adjr < 0) ? 0 : adjr), ((adjg > 1 || adjg < 0) ? 0 : adjg), ((adjb > 1 || adjb < 0) ? 0 : adjb) ); sr = sr + (adjust * dr); sg = sg + (adjust * dg); sb = sb + (adjust * db); return ([inversePow(sr),inversePow(sg),inversePow(sb)]); } function inversePow(v) { return (255 * (v <= 0 ? 0 : v >= 1 ? 1 : Math.pow(v, 1 / 2.2))); } function anomylize(a,b) { const v = 1.75, d = v * 1 + 1; return ([ (v * b[0] + a[0] * 1) / d, (v * b[1] + a[1] * 1) / d, (v * b[2] + a[2] * 1) / d ]); } function monochrome(r) { const z = Math.round(r[0] * 0.299 + r[1] * 0.587 + r[2] * 0.114); return ([z,z,z]); } return fBlind; }()32:[] 2f:{"id":"a066948c8edd56c2","slug":"colorblindlib","title":"ColorBlindLib","thumbnail":"ddf159bac75f67e4863b3c73289e1f861c3f61f2299985fe35a143793a1a4f50","access_level":"public","create_time":"$D2020-05-13T17:35:24.379Z","update_time":"$D2020-05-13T17:59:41.880Z","view_time":null,"first_public_time":"$D2020-05-13T17:35:46.866Z","fork":false,"stars":1,"starred":false,"owner":{"type":"team","id":"91415db2a19585e8","login":"spattana","name":"Sumant Pattanaik","avatar_url":"https://avatars-next.observableusercontent.com/5c3b1a0caf2ce230772f04126acb360531061440f39e4326260bd62e4a5e16f0","tier":"starter_2024"},"version":13,"publish_version":13,"role":null,"authored":false,"authors":[{"type":"individual","id":"a51e58c27848cfd7","login":"spattana","name":"Sumant Pattanaik","avatar_url":"https://avatars-next.observableusercontent.com/5c3b1a0caf2ce230772f04126acb360531061440f39e4326260bd62e4a5e16f0","tier":null}],"members":[{"type":"individual","id":"a51e58c27848cfd7","login":"spattana","name":"Sumant Pattanaik","avatar_url":"https://avatars-next.observableusercontent.com/5c3b1a0caf2ce230772f04126acb360531061440f39e4326260bd62e4a5e16f0","tier":null,"role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"subscribed":null,"forks":0,"collection":{"id":"0cc4112516b25655","slug":"color","title":"Color","owner":{"id":"91415db2a19585e8","login":"spattana","name":"Sumant Pattanaik"}},"type":"notebook","body":{"title":"ColorBlindLib","cells":[{"id":0,"value":"md`# ColorBlindLib`","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":2,"value":"$31","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":8,"value":"md`NOTE:This page uses the Color Blind Simulation function \n by Matthew Wickline and the\n Human-Computer Interaction Resource Network (http://hcirn.com/) copyright (c) 2000-2001.
\nThe code is adapted from hcirn_colorblind_simulation.js available in https://github.com/MaPePeR/jsColorblindSimulator with slight modification.\nThe modifications are: A couple of missing declaration of varying variables and the code is encapsulated in a function.`","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"}],"files":"$W32","stdlib":"1","titling":"auto"}} 30:"$2f:body"