NoFunc | Color Blindness Library

This function allows you to simulate common and uncommon color blindness.

Use the fBlind[] in order to convert. For instance: fBlind['Tritanomaly'](RGB) would convert RGB[] into Tritanomaly.

External: Sphere, Studio & Farbansichten
JAVASCRIPT

/*

    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/ ).

*/

var 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};

var 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))); };

function blindMK(r,t) { var gamma=2.2, wx=0.312713, wy=0.329016, wz=0.358271;

    function Color() { this.rgb_from_xyz=xyz2rgb; this.xyz_from_rgb=rgb2xyz; }

    var b=r[2], g=r[1], r=r[0], c=new Color;
    
    c.r=Math.pow(r/255,gamma); c.g=Math.pow(g/255,gamma); c.b=Math.pow(b/255,gamma); c.xyz_from_rgb();

    var sum_xyz=c.x+c.y+c.z; c.u=0; c.v=0;
    
    if(sum_xyz!=0) { c.u=c.x/sum_xyz; c.v=c.y/sum_xyz; }

    var nx=wx*c.y/wy, nz=wz*c.y/wy, clm, s=new Color(), d=new Color(); d.y=0;
    
    if(c.u<rBlind[t].cpu) { clm=(rBlind[t].cpv-c.v)/(rBlind[t].cpu-c.u); } else { clm=(c.v-rBlind[t].cpv)/(c.u-rBlind[t].cpu); }

    var clyi=c.v-c.u*clm; d.u=(rBlind[t].ayi-clyi)/(clm-rBlind[t].am); d.v=(clm*d.u)+clyi;

    s.x=d.u*c.y/d.v; s.y=c.y; s.z=(1-(d.u+d.v))*c.y/d.v; s.rgb_from_xyz();

    d.x=nx-s.x; d.z=nz-s.z; d.rgb_from_xyz();

    var adjr=d.r?((s.r<0?0:1)-s.r)/d.r:0, adjg=d.g?((s.g<0?0:1)-s.g)/d.g:0, adjb=d.b?((s.b<0?0:1)-s.b)/d.b:0;

    var adjust=Math.max(((adjr>1||adjr<0)?0:adjr), ((adjg>1||adjg<0)?0:adjg), ((adjb>1||adjb<0)?0:adjb));

    s.r=s.r+(adjust*d.r); s.g=s.g+(adjust*d.g); s.b=s.b+(adjust*d.b);
    
    function z(v) { return(255*(v<=0?0:v>=1?1:Math.pow(v,1/gamma))); }

    return([z(s.r),z(s.g),z(s.b)]);

}

function rgb2xyz() {

    this.x=(0.430574*this.r+0.341550*this.g+0.178325*this.b);
    this.y=(0.222015*this.r+0.706655*this.g+0.071330*this.b);
    this.z=(0.020183*this.r+0.129553*this.g+0.939180*this.b);

    return this;

}

function xyz2rgb() {

    this.r=( 3.063218*this.x-1.393325*this.y-0.475802*this.z);
    this.g=(-0.969243*this.x+1.875966*this.y+0.041555*this.z);
    this.b=( 0.067871*this.x-0.228834*this.y+1.069251*this.z);

    return this;

}

function anomylize(a,b) { var 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) { var z=Math.round(r[0]*.299+r[1]*.587+r[2]*.114); return([z,z,z]); }