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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 | 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 480573x 480573x 2x 2x 2x 2x 2x 2x 480573x 480573x 480573x 480573x 480573x 480573x 11x 480573x 5307x 480573x 8171x 480573x 480573x 480573x 480573x 480573x 480573x 480573x 480573x 480573x 480573x 480573x 2x 2x 2x 2x 2x 2x 2x 2x 2x 480574x 480574x 480574x 480574x 480574x 480574x 480574x 10x 480574x 10x 480574x 10x 480574x 480574x 480574x 480574x 480574x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x | /** @import { RgbColor, LabColor, XyzColor} from './color-types.d.js' */
const pow = Math.pow
/**
* Converts sRGB color `c` to CIE L*a*b*.
* @param {RgbColor} c standard-RGB color to convert, should have fields R,G,B
* @returns {LabColor} the color in the CIE L*a*b* color space
*/
export function rgbToLab (c) {
return xyzToLab(rgbToXyz(c))
}
/**
* Converts sRGB color to CIE 1931 XYZ color (2° observer). Based on {@link http://www.easyrgb.com/en/math.php}
* @param {RgbColor} c standard-RGB color to convert, should have fields R,G,B
* @returns {XyzColor} the color in the CIE 1931 XYZ color space
*/
function rgbToXyz (c) {
let R = (c.R / 255)
let G = (c.G / 255)
let B = (c.B / 255)
if (R > 0.04045) R = pow(((R + 0.055) / 1.055), 2.4)
else R = R / 12.92
if (G > 0.04045) G = pow(((G + 0.055) / 1.055), 2.4)
else G = G / 12.92
if (B > 0.04045) B = pow(((B + 0.055) / 1.055), 2.4)
else B = B / 12.92
R *= 100
G *= 100
B *= 100
// Observer. = 2°, Illuminant = D65
const X = R * 0.4124 + G * 0.3576 + B * 0.1805
const Y = R * 0.2126 + G * 0.7152 + B * 0.0722
const Z = R * 0.0193 + G * 0.1192 + B * 0.9505
return { X, Y, Z }
}
/**
* Converts CIE 1931 XYZ values (2° observer) `c` to CIE L*a*b*.
*
* @see {@link http://www.easyrgb.com/en/math.php}
* @param {XyzColor} c - the CIE 1931 XYZ color to convert which refers to the D65/2° standard illuminant, should have fields X,Y,Z
* @returns {LabColor} the color in the CIE L*a*b* color space
*/
export function xyzToLab (c) {
const refY = 100.000
const refZ = 108.883
const refX = 95.047 // Observer= 2°, Illuminant= D65, @see Reference values in the table below
let Y = c.Y / refY
let Z = c.Z / refZ
let X = c.X / refX
if (X > 0.008856) X = pow(X, 1 / 3)
else X = (7.787 * X) + (16 / 116)
if (Y > 0.008856) Y = pow(Y, 1 / 3)
else Y = (7.787 * Y) + (16 / 116)
if (Z > 0.008856) Z = pow(Z, 1 / 3)
else Z = (7.787 * Z) + (16 / 116)
const L = (116 * Y) - 16
const a = 500 * (X - Y)
const b = 200 * (Y - Z)
return { L, a, b }
}
/**
*
* XYZ (Tristimulus) Reference values of a perfect reflecting diffuser ( source: http://www.easyrgb.com/en/math.php )
*
* Observer 2° (CIE 1931) 10° (CIE 1964) Note
* Illuminant X2 Y2 Z2 X10 Y10 Z10
* A 109.850 100.000 35.585 111.144 100.000 35.200 Incandescent/tungsten
* B 99.0927 100.000 85.313 99.178 100.000 84.3493 Old direct sunlight at noon
* C 98.074 100.000 118.232 97.285 100.000 116.145 Old daylight
* D50 96.422 100.000 82.521 96.720 100.000 81.427 ICC profile PCS
* D55 95.682 100.000 92.149 95.799 100.000 90.926 Mid-morning daylight
* D65 95.047 100.000 108.883 94.811 100.000 107.304 Daylight, sRGB, Adobe-RGB
* D75 94.972 100.000 122.638 94.416 100.000 120.641 North sky daylight
* E 100.000 100.000 100.000 100.000 100.000 100.000 Equal energy
* F1 92.834 100.000 103.665 94.791 100.000 103.191 Daylight Fluorescent
* F2 99.187 100.000 67.395 103.280 100.000 69.026 Cool fluorescent
* F3 103.754 100.000 49.861 108.968 100.000 51.965 White Fluorescent
* F4 109.147 100.000 38.813 114.961 100.000 40.963 Warm White Fluorescent
* F5 90.872 100.000 98.723 93.369 100.000 98.636 Daylight Fluorescent
* F6 97.309 100.000 60.191 102.148 100.000 62.074 Lite White Fluorescent
* F7 95.044 100.000 108.755 95.792 100.000 107.687 Daylight fluorescent, D65 simulator
* F8 96.413 100.000 82.333 97.115 100.000 81.135 Sylvania F40, D50 simulator
* F9 100.365 100.000 67.868 102.116 100.000 67.826 Cool White Fluorescent
* F10 96.174 100.000 81.712 99.001 100.000 83.134 Ultralume 50, Philips TL85
* F11 100.966 100.000 64.370 103.866 100.000 65.627 Ultralume 40, Philips TL84
* F12 108.046 100.000 39.228 111.428 100.000 40.353 Ultralume 30, Philips TL83
*/
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