appleneko2001
71 lines
2.2 KiB
C#
71 lines
2.2 KiB
C#
using System;
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using Avalonia.Media;
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namespace Material.Colors.ColorManipulation
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{
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internal static class XyzConverter
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{
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public static Color ToColor(this Xyz xyz)
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{
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double XyzRgb(double d)
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{
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if (d > 0.0031308)
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return 255.0 * (1.055 * Math.Pow(d, 1.0 / 2.4) - 0.055);
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return 255.0 * (12.92 * d);
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}
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byte Clip(double d)
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{
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if (d < 0) return 0;
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if (d > 255) return 255;
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return (byte) Math.Round(d);
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}
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var r = XyzRgb(3.2404542 * xyz.X - 1.5371385 * xyz.Y - 0.4985314 * xyz.Z);
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var g = XyzRgb(-0.9692660 * xyz.X + 1.8760108 * xyz.Y + 0.0415560 * xyz.Z);
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var b = XyzRgb(0.0556434 * xyz.X - 0.2040259 * xyz.Y + 1.0572252 * xyz.Z);
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return Color.FromRgb(Clip(r), Clip(g), Clip(b));
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}
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public static Xyz ToXyz(this Color c)
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{
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double RgbXyz(double v)
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{
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v /= 255;
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if (v > 0.04045)
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return Math.Pow((v + 0.055) / 1.055, 2.4);
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return v / 12.92;
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}
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var r = RgbXyz(c.R);
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var g = RgbXyz(c.G);
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var b = RgbXyz(c.B);
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var x = 0.4124564 * r + 0.3575761 * g + 0.1804375 * b;
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var y = 0.2126729 * r + 0.7151522 * g + 0.0721750 * b;
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var z = 0.0193339 * r + 0.1191920 * g + 0.9503041 * b;
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return new Xyz(x, y, z);
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}
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public static Xyz ToXyz(this Lab lab)
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{
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double LabXyz(double d)
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{
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if (d > LabConstants.ECubedRoot)
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return d * d * d;
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return (116 * d - 16) / LabConstants.K;
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}
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var y = (lab.L + 16.0) / 116.0;
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var x = double.IsNaN(lab.A) ? y : y + lab.A / 500.0;
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var z = double.IsNaN(lab.B) ? y : y - lab.B / 200.0;
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y = LabConstants.WhitePointY * LabXyz(y);
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x = LabConstants.WhitePointX * LabXyz(x);
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z = LabConstants.WhitePointZ * LabXyz(z);
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return new Xyz(x, y, z);
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}
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}
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} |