Add Macbeth ColorChecker dataset

waacton · Nov 10, 2023 · 6311595 · 6311595
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diff --git a/Unicolour.Datasets/Macbeth.cs b/Unicolour.Datasets/Macbeth.cs
@@ -0,0 +1,50 @@
+namespace Wacton.Unicolour.Datasets;
+
+public static class Macbeth
+{
+    /*
+     * table at https://xritephoto.com/documents/literature/en/ColorData-1p_EN.pdf references LAB using D50
+     * but their LAB values appear to be a bit off, unclear why (perhaps an unusual chromatic adaptation method?)
+     * ----------
+     * there is also https://poynton.ca/notes/color/GretagMacbeth-ColorChecker.html containing apparent Illuminant C xyY data
+     * which is even further removed from the manufacturer's sRGB values
+     */
+    private static readonly XyzConfiguration XyzConfig = new(WhitePoint.From(Illuminant.D50));
+    private static readonly Configuration Config = new(RgbConfiguration.StandardRgb, XyzConfig);
+
+    public static readonly Unicolour DarkSkin = new(ColourSpace.Rgb255, Config, 115, 82, 68);
+    public static readonly Unicolour LightSkin = new(ColourSpace.Rgb255, Config, 194, 150, 130);
+    public static readonly Unicolour BlueSky = new(ColourSpace.Rgb255, Config, 98, 122, 157);
+    public static readonly Unicolour Foliage = new(ColourSpace.Rgb255, Config, 87, 108, 67);
+    public static readonly Unicolour BlueFlower = new(ColourSpace.Rgb255, Config, 133, 128, 177);
+    public static readonly Unicolour BluishGreen = new(ColourSpace.Rgb255, Config, 103, 189, 170);
+    public static readonly Unicolour Orange = new(ColourSpace.Rgb255, Config, 214, 126, 44);
+    public static readonly Unicolour PurplishBlue = new(ColourSpace.Rgb255, Config, 80, 91, 166);
+    public static readonly Unicolour ModerateRed = new(ColourSpace.Rgb255, Config, 193, 90, 99);
+    public static readonly Unicolour Purple = new(ColourSpace.Rgb255, Config, 94, 60, 108);
+    public static readonly Unicolour YellowGreen = new(ColourSpace.Rgb255, Config, 157, 188, 64);
+    public static readonly Unicolour OrangeYellow = new(ColourSpace.Rgb255, Config, 224, 163, 46);
+    public static readonly Unicolour Blue = new(ColourSpace.Rgb255, Config, 56, 61, 150);
+    public static readonly Unicolour Green = new(ColourSpace.Rgb255, Config, 70, 148, 73);
+    public static readonly Unicolour Red = new(ColourSpace.Rgb255, Config, 175, 54, 60);
+    public static readonly Unicolour Yellow = new(ColourSpace.Rgb255, Config, 231, 199, 31);
+    public static readonly Unicolour Magenta = new(ColourSpace.Rgb255, Config, 187, 86, 149);
+    public static readonly Unicolour Cyan = new(ColourSpace.Rgb255, Config, 8, 133, 161);
+    public static readonly Unicolour White = new(ColourSpace.Rgb255, Config, 243, 243, 242);
+    public static readonly Unicolour Neutral8 = new(ColourSpace.Rgb255, Config, 200, 200, 200);
+    public static readonly Unicolour Neutral65 = new(ColourSpace.Rgb255, Config, 160, 160, 160);
+    public static readonly Unicolour Neutral5 = new(ColourSpace.Rgb255, Config, 122, 122, 121);
+    public static readonly Unicolour Neutral35 = new(ColourSpace.Rgb255, Config, 85, 85, 85);
+    public static readonly Unicolour Black = new(ColourSpace.Rgb255, Config, 52, 52, 52);
+
+    public static readonly List<Unicolour> Natural = new() { DarkSkin, LightSkin, BlueSky, Foliage, BlueFlower, BluishGreen };
+    public static readonly List<Unicolour> Miscellaneous = new() { Orange, PurplishBlue, ModerateRed, Purple, YellowGreen, OrangeYellow };
+    public static readonly List<Unicolour> PrimaryAndSecondary = new() { Blue, Green, Red, Yellow, Magenta, Cyan };
+    public static readonly List<Unicolour> Greyscale = new() { White, Neutral8, Neutral65, Neutral5, Neutral35, Black };
+
+    public static IEnumerable<Unicolour> All => new List<Unicolour>()
+        .Concat(Natural)
+        .Concat(Miscellaneous)
+        .Concat(PrimaryAndSecondary)
+        .Concat(Greyscale);
+}
diff --git a/Unicolour.Tests/DatasetMacbethTests.cs b/Unicolour.Tests/DatasetMacbethTests.cs
@@ -0,0 +1,51 @@
+namespace Wacton.Unicolour.Tests;
+
+using System.Collections.Generic;
+using System.Linq;
+using NUnit.Framework;
+using Wacton.Unicolour.Datasets;
+using Wacton.Unicolour.Tests.Utils;
+using static Datasets.Macbeth;
+
+public class DatasetMacbethTests
+{
+    private static readonly Configuration ConfigIlluminantC = new(xyzConfiguration: new XyzConfiguration(WhitePoint.From(Illuminant.C)));
+
+    private static readonly List<TestCaseData> XyyIlluminantC = new()
+    {
+        new TestCaseData(DarkSkin, new Xyy(0.400, 0.350, 10.1 / 100.0)).SetName("Dark skin"),
+        new TestCaseData(LightSkin, new Xyy(0.377, 0.345, 35.8 / 100.0)).SetName("Light skin"),
+        new TestCaseData(BlueSky, new Xyy(0.247, 0.251, 19.3 / 100.0)).SetName("Blue sky"),
+        new TestCaseData(Foliage, new Xyy(0.337, 0.422, 13.3 / 100.0)).SetName("Foliage"),
+        new TestCaseData(BlueFlower, new Xyy(0.265, 0.240, 24.3 / 100.0)).SetName("Blue flower"),
+        new TestCaseData(BluishGreen, new Xyy(0.261, 0.343, 43.1 / 100.0)).SetName("Bluish green"),
+        new TestCaseData(Orange, new Xyy(0.506, 0.407, 30.1 / 100.0)).SetName("Orange"),
+        new TestCaseData(PurplishBlue, new Xyy(0.211, 0.175, 12 / 100.0)).SetName("Purplish blue"),
+        new TestCaseData(ModerateRed, new Xyy(0.453, 0.306, 19.8 / 100.0)).SetName("Moderate red"),
+        new TestCaseData(Purple, new Xyy(0.285, 0.202, 6.6 / 100.0)).SetName("Purple"),
+        new TestCaseData(YellowGreen, new Xyy(0.38, 0.489, 44.3 / 100.0)).SetName("Yellow green"),
+        new TestCaseData(OrangeYellow, new Xyy(0.473, 0.438, 43.1 / 100.0)).SetName("Orange yellow"),
+        new TestCaseData(Blue, new Xyy(0.187, 0.129, 6.1 / 100.0)).SetName("Blue"),
+        new TestCaseData(Green, new Xyy(0.305, 0.478, 23.4 / 100.0)).SetName("Green"),
+        new TestCaseData(Red, new Xyy(0.539, 0.313, 12 / 100.0)).SetName("Red"),
+        new TestCaseData(Yellow, new Xyy(0.448, 0.47, 59.1 / 100.0)).SetName("Yellow"),
+        new TestCaseData(Magenta, new Xyy(0.364, 0.233, 19.8 / 100.0)).SetName("Magenta"),
+        new TestCaseData(Cyan, new Xyy(0.196, 0.252, 19.8 / 100.0)).SetName("Cyan"),
+        new TestCaseData(White, new Xyy(0.31, 0.316, 90 / 100.0)).SetName("White"),
+        new TestCaseData(Neutral8, new Xyy(0.31, 0.316, 59.1 / 100.0)).SetName("Neutral 8"),
+        new TestCaseData(Neutral65, new Xyy(0.31, 0.316, 36.2 / 100.0)).SetName("Neutral 6.5"),
+        new TestCaseData(Neutral5, new Xyy(0.31, 0.316, 19.8 / 100.0)).SetName("Neutral 5"),
+        new TestCaseData(Neutral35, new Xyy(0.31, 0.316, 9 / 100.0)).SetName("Neutral 3.5"),
+        new TestCaseData(Black, new Xyy(0.31, 0.316, 3.1 / 100.0)).SetName("Black")
+    };
+
+    [TestCaseSource(nameof(XyyIlluminantC))]
+    public void Test(Unicolour unicolour, Xyy expectedXyy)
+    {
+        var unicolourIlluminantC = unicolour.ConvertToConfiguration(ConfigIlluminantC);
+        TestUtils.AssertTriplet<Xyy>(unicolourIlluminantC, expectedXyy.Triplet, 0.02);
+    }
+
+    [Test]
+    public void All() => Assert.That(Macbeth.All.Distinct().Count(), Is.EqualTo(24));
+}