30: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; }()31:[] 2e:{"title":"ColorBlindLib","cells":[{"id":0,"value":"md`# ColorBlindLib`","pinned":true,"hidden":false,"mode":"ojs"},{"id":2,"value":"$30","pinned":true,"hidden":false,"mode":"ojs"},{"id":8,"value":"md`NOTE:This page uses the Color Blind Simulation function \n by Matthew Wickline and the\n Human-Computer Interaction Resource Network (http://hcirn.com/) copyright (c) 2000-2001.
\nThe code is adapted from hcirn_colorblind_simulation.js available in https://github.com/MaPePeR/jsColorblindSimulator with slight modification.\nThe modifications are: A couple of missing declaration of varying variables and the code is encapsulated in a function.`","pinned":true,"hidden":false,"mode":"ojs"}],"files":"$W31","stdlib":"1","titling":"auto"}