Created
January 10, 2022 05:31
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Functions to convert color formats.
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| function RGBtoHSV(r, g, b) { | |
| if (arguments.length === 1) { | |
| g = r.g, b = r.b, r = r.r; | |
| } | |
| var max = Math.max(r, g, b), min = Math.min(r, g, b), | |
| d = max - min, | |
| h, | |
| s = (max === 0 ? 0 : d / max), | |
| v = max / 255; | |
| switch (max) { | |
| case min: h = 0; break; | |
| case r: h = (g - b) + d * (g < b ? 6: 0); h /= 6 * d; break; | |
| case g: h = (b - r) + d * 2; h /= 6 * d; break; | |
| case b: h = (r - g) + d * 4; h /= 6 * d; break; | |
| } | |
| return [h*360,s,v]; | |
| } | |
| function RGBtoHEX(r, g, b) { | |
| return "#" + ((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1); | |
| } | |
| function RGBtoLuminance(r, g, b) { | |
| var a = [r, g, b].map(function (v) { | |
| v /= 255; | |
| return v <= 0.03928 | |
| ? v / 12.92 | |
| : Math.pow( (v + 0.055) / 1.055, 2.4 ); | |
| }); | |
| return a[0] * 0.2126 + a[1] * 0.7152 + a[2] * 0.0722; | |
| } | |
| function HEXtoRGB(hex) { | |
| var rgb = hex.match(/[\d\w]{1,2}/g); | |
| var rgbArray = [ | |
| Math.round(parseInt(rgb[0], 16)), | |
| Math.round(parseInt(rgb[1], 16)), | |
| Math.round(parseInt(rgb[2], 16)) | |
| ]; | |
| return rgbArray; | |
| } | |
| function HSVtoRGB(h,s,v) { | |
| let f= (n,k=(n+h/60)%6) => v - v*s*Math.max( Math.min(k,4-k,1), 0); | |
| return [Math.round(f(5)*255),Math.round(f(3)*255),Math.round(f(1)*255)]; | |
| } | |
| function HSVtoHEX(h,s,v) { | |
| let rgb = HSVtoRGB(h,s,v); | |
| let r = rgb[0]; | |
| let g = rgb[1]; | |
| let b = rgb[2]; | |
| return RGBtoHEX(r,g,b); | |
| } |
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