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diff --git a/libdimension/dimension/color.h b/libdimension/dimension/color.h
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+/*************************************************************************
+ * Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com>               *
+ *                                                                       *
+ * This file is part of Dimension.                                       *
+ *                                                                       *
+ * Dimension is free software; you can redistribute it and/or modify it  *
+ * under the terms of the GNU Lesser General Public License as published *
+ * by the Free Software Foundation; either version 3 of the License, or  *
+ * (at your option) any later version.                                   *
+ *                                                                       *
+ * Dimension is distributed in the hope that it will be useful, but      *
+ * WITHOUT ANY WARRANTY; without even the implied warranty of            *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *
+ * Lesser General Public License for more details.                       *
+ *                                                                       *
+ * You should have received a copy of the GNU Lesser General Public      *
+ * License along with this program.  If not, see                         *
+ * <http://www.gnu.org/licenses/>.                                       *
+ *************************************************************************/
+
+/*
+ * Types to represent color.
+ */
+
+#ifndef DIMENSION_COLOR_H
+#define DIMENSION_COLOR_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* CIE 1931 XYZ color. */
+typedef struct {
+  double X, Y, Z; /* X, Y, and Z are the tristimulus values of a color in CIE
+                     1931 XYZ color space.  We use an unlimited light model
+                     here, where the range of X, Y, and Z are unbounded >= 0. */
+  double alpha, trans; /* Alpha transparancy only lets light of this color
+                          through; regular transparancy lets all colors
+                          through */
+} dmnsn_color;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* DIMENSION_COLOR_H */