// Complement temprgb={ r: 0, g: 0xff, b: 0xff }; // Cyan temphsv=RGB2HSV(temprgb); temphsv.hue=HueShift(temphsv.hue,180.0); temprgb=HSV2RGB(temphsv); console.log(temprgb); // Complement is red (0xff, 0, 0) function RGB2HSV(rgb) { hsv = new Object(); max=max3(rgb.r,rgb.g,rgb.b); dif=max-min3(rgb.r,rgb.g,rgb.b); hsv.saturation=(max==0.0)?0:(100*dif/max); if (hsv.saturation==0) hsv.hue=0; else if (rgb.r==max) hsv.hue=60.0*(rgb.g-rgb.b)/dif; else if (rgb.g==max) hsv.hue=120.0+60.0*(rgb.b-rgb.r)/dif; else if (rgb.b==max) hsv.hue=240.0+60.0*(rgb.r-rgb.g)/dif; if (hsv.hue<0.0) hsv.hue+=360.0; hsv.value=Math.round(max*100/255); hsv.hue=Math.round(hsv.hue); hsv.saturation=Math.round(hsv.saturation); return hsv; } // RGB2HSV and HSV2RGB are based on Color Match Remix [http://color.twysted.net/] // which is based on or copied from ColorMatch 5K [http://colormatch.dk/] function HSV2RGB(hsv) { var rgb=new Object(); if (hsv.saturation==0) { rgb.r=rgb.g=rgb.b=Math.round(hsv.value*2.55); } else { hsv.hue/=60; hsv.saturation/=100; hsv.value/=100; i=Math.floor(hsv.hue); f=hsv.hue-i; p=hsv.value*(1-hsv.saturation); q=hsv.value*(1-hsv.saturation*f); t=hsv.value*(1-hsv.saturation*(1-f)); switch(i) { case 0: rgb.r=hsv.value; rgb.g=t; rgb.b=p; break; case 1: rgb.r=q; rgb.g=hsv.value; rgb.b=p; break; case 2: rgb.r=p; rgb.g=hsv.value; rgb.b=t; break; case 3: rgb.r=p; rgb.g=q; rgb.b=hsv.value; break; case 4: rgb.r=t; rgb.g=p; rgb.b=hsv.value; break; default: rgb.r=hsv.value; rgb.g=p; rgb.b=q; } rgb.r=Math.round(rgb.r*255); rgb.g=Math.round(rgb.g*255); rgb.b=Math.round(rgb.b*255); } return rgb; } //Adding HueShift via Jacob (see comments) function HueShift(h,s) { h+=s; while (h>=360.0) h-=360.0; while (h<0.0) h+=360.0; return h; } //min max via Hairgami_Master (see comments) function min3(a,b,c) { return (a<b)?((a<c)?a:c):((b<c)?b:c); } function max3(a,b,c) { return (a>b)?((a>c)?a:c):((b>c)?b:c); }
