Add controlled list of colors for categorizing images

src/MDColorsSet.php

@@ -0,0 +1,52 @@
+<?PHP
+/**
+ * Contains a class for controlling the list of base colors.
+ *
+ * @author Joshua Ramon Enslin <joshua@museum-digital.de>
+ */
+declare(strict_types = 1);
+
+/**
+ * Class containing available colors.
+ */
+final class MDColorsSet extends MDValueSet {
+
+    const COLOR_NAMES = [
+        "black",
+        "green",
+        "silver",
+        "lime",
+        "gray",
+        "olive",
+        "white",
+        "yellow",
+        "maroon",
+        "navy",
+        "red",
+        "blue",
+        "purple",
+        "teal",
+        "fuchsia",
+        "aqua",
+    ];
+
+    const COLORS_RGB = [
+        "black"     => [0, 0, 0],
+        "green"     => [0, 128, 0],
+        "silver"    => [192, 192, 192],
+        "lime"      => [0, 255, 0],
+        "gray"      => [128, 0, 128],
+        "olive"     => [128, 128, 0],
+        "white"     => [255, 255, 255],
+        "yellow"    => [255, 255, 0],
+        "maroon"    => [128, 0, 0],
+        "navy"      => [0, 0, 128],
+        "red"       => [255, 0, 0],
+        "blue"      => [0, 0, 255],
+        "purple"    => [128, 0, 128],
+        "teal"      => [0, 128, 128],
+        "fuchsia"   => [255, 0, 255],
+        "aqua"      => [0, 255, 255],
+    ];
+
+}